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Influence of Sewage Sludge Ash and Superabsorbent Polymer on Volume Deformation of Cement Paste with Low Water/binder Ratio 认领 引用
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作者 GU Chunping YU Zhe +6 位作者 ZHANG Jiahui BAO Zhenan WEI Haixia XU Yanwen WANG Qiannan DING Cong KONG Deyu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期768-777,共10页
In order to facilitate the recycling of sewage sludge ash(SSA),and to reveal the effects of SSA and super absorbent polymers(SAP)on the volumetric deformation of the high performance cementbased materials,the separate... In order to facilitate the recycling of sewage sludge ash(SSA),and to reveal the effects of SSA and super absorbent polymers(SAP)on the volumetric deformation of the high performance cementbased materials,the separate and coupled effects of SSA and SAP on the volumetric deformation of the cement pastes with a low water/binder ratio(0.25)under different environmental conditions(sealed,drying,and water immersion environments)were studied.The results showed that the addition of SSA or SAP reduced the autogenous and drying shrinkage,and increased the water immersion expansion strain of the cement pastes.The addition of SSA and SAP together further reduced the autogenous and drying shrinkage,and increased the water immersion expansion.The synergistic effect of SSA and SAP on the volumetric deformation of the cement pastes was observed under a sealed environment.It was less significant under a water immersion environment.Under drying environment,the reduction in shrinkage caused by the combined addition of SSA and SAP was lower than the sum of the reduced shrinkages caused by SSA and SAP alone.These findings provided a new potential approach for the recycling and utilization of SSA. 展开更多
关键词 cement paste sewage sludge ash super absorbent polymer volumetric deformation
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Mitigating acid rain effects on stabilized soils:the role of phosphogypsum in leaching resistance 认领 引用
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作者 Xia Bian Jianyu Xiao +1 位作者 Tao Zhang Lingling Zeng 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期2300-2313,共14页
Phosphogypsum,an industrial solid waste,is an effective binder for partially replacing cement in stabilizing dredged sediments.Acid rain,as a worldwide ecological problem,also affects the long-term stability and susta... Phosphogypsum,an industrial solid waste,is an effective binder for partially replacing cement in stabilizing dredged sediments.Acid rain,as a worldwide ecological problem,also affects the long-term stability and sustainability of geotechnical materials and structures.However,the research on leaching effects and long-term durability of phosphogypsum-stabilized soils under acid rain conditions is limited and remains a significant challenge for practical applications.This study investigates the leaching effects and long-term durability of phosphogypsum-stabilized soils by simulating acid rain erosion through semi-dynamic leaching tests.Key parameters,including leached Ca2+concentration,leachate pH,and unconfined compressive strength after leaching,were evaluated.Microscopic analyses with X-ray diffraction(XRD)and scanning electron microscopy(SEM)were also conducted to explore the underlying mechanisms.The results indicate that the presence of phosphogypsum in stabilized soil with high water content shows a significant improvement in leaching resistance subjected to acid ions,evidencing a lower Ca2+concentration and pH value in the leachate,and a higher strength after leaching compared to those samples without phosphogypsum.SEM images and XRD analysis revealed that samples with higher phosphogypsum content possess denser structures due to more needle-shaped ettringite and other minerals in the soil matrix,contributing to improved strength and leaching resistance.The enhanced strength and leaching resistance of phosphogypsum-stabilized soil can be attributed to additional gel formation,a rise in swelling potential,ettringite bridging,and a denser microstructure,which reduces Ca2+availability for leaching in acidic environments. 展开更多
关键词 Leaching Phosphogypsum Stabilized sediment Microscopic characteristics Leaching resistance
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Deformation of servo steel supported zoned excavation pits in Hangzhou soft soil 认领 引用
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作者 Zhaorui Lin Yalong Jiang +5 位作者 Yun Duan Tao Fang Kaifang Yang Guohui Feng Gang Lin Changjie Xu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期3056-3069,共14页
Zonal excavation and servo-active regulation are two common methods for controlling deformation in soft soil deep foundation pits.However,in-depth research on the deformation behavior of foundation pits under the comb... Zonal excavation and servo-active regulation are two common methods for controlling deformation in soft soil deep foundation pits.However,in-depth research on the deformation behavior of foundation pits under the combined effect of these two methods remains limited.This study focuses on a large soft soil foundation-pit project adjacent to a subway station and tunnels in Hangzhou and proposes a method to evaluate surface settlement profilesoutside the zoned excavation pits.To this end,long-term on-site monitoring of soil displacements and diaphragm wall deformations during the excavation process is performed.The results show that surface settlement near the pit edge is primarily influenced by the construction of the outermost pit,whereas the settlement further away is predominantly affected by the construction of a second sub-pit from the edge.Pits located outside the metro protection line have a relatively smaller impact on surface settlement.The servo-active control system occasionally causes localized pushback of the diaphragm wall,leading to an“S-shaped”deformation pattern.The zonal excavation method proves beneficialin optimizing the excavation scheme and enhancing the rigidity of the support system.The combined use of the servo-active control system and zonal excavation method effectively regulates foundation pit deformation.The study findingsconfirmthe validity of the subway protection line and support the excavation scheme employed.Thus,this study serves as a guide for performing deformation control during the construction of large soft soil foundation pits in the Hangzhou area. 展开更多
关键词 Deep foundation pit Pit deformation Surface settlement Zonal excavation Servo-steel support Long-term monitoring
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Degradation of leachate and high concentration emerging pollutant tetracycline through electro oxidation 认领 引用 被引量：1
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作者 Siyi Li Qiaona Xie +3 位作者 Mingdi Yang Ningrui Wu Yiting Lian Chengran Fang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第1期142-153,共12页
In this work,we constructed a three-dimensional electrochemical system(3D-ECO),which included the cathode and anode electrode plates,as well as the screening of three-dimensional particle electrodes and parameter opti... In this work,we constructed a three-dimensional electrochemical system(3D-ECO),which included the cathode and anode electrode plates,as well as the screening of three-dimensional particle electrodes and parameter opti-mization,for the degradation of landfill leachate(LL)containing elevated levels of tetracycline(TC),and explored its mechanism of action.Firstly,titanium-based ruthenium-iridium(Ti/RuO2-IrO2),titanium-based ruthenium-iridium-platinum(Ti/Pt-RuO2-IrO2),and titanium-based tin-antimony(Ti/SnO2-Sb2O3)were employed as an-odes in the electrocatalytic oxidation system,with titanium and stainless steel plates serving as cathodes,to construct the optimal two-dimensional electrocatalytic oxidation system(2D-ECO)through cross-comparison ex-periments.Subsequently,using granular activated carbon(GAC),coconut shell biochar(CBC),walnut shell carbon(WBC),and bamboo charcoal(BBC)as particle electrodes,a 3D-ECO system was developed.The influence of var-ious operational parameters on treating TC-containing LL was investigated.The optimal operating parameters obtained from the study was:pH=5,current density of 30 mA/cm2,particle dosage of 7 g/L,particle size ranging from 1.70 to 2.00 mm,and electrode spacing of 4 cm.Under these conditions,the COD removal rate of 3D-ECO within three hours was 90.25%,the TC removal rate was 72.41%,and the NH3-N removal rate was 39.52%.The removal of TC followed a pseudo-first-order kinetic model.Additionally,degradation mechanisms were elucidated through electron paramagnetic resonance(EPR)spectrometer and Tert-Butanol(TBA)quenching experiments,indicating that the degradation primarily occurred through a non-radical(1O2)pathway.This re-search offers a comprehensive analysis of the simultaneous breakdown of intricate LL matrices and TC,enhancing our comprehension of the degradation processes and underlying mechanisms. 展开更多
关键词 Particle electrodes Tetracycline Landfill leachate Three-dimensional electrocatalytic oxidation Degradation mechanism
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Attention Mechanisms and FFM Feature Fusion Module-Based Modification of the Deep Neural Network for Detection of Structural Cracks 认领 引用 被引量：1
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作者 Tao Jin Zhekun Shou +1 位作者 Hongchao Liu Yuchun Shao 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第2期345-366,共22页
This research centers on structural health monitoring of bridges,a critical transportation infrastructure.Owing to the cumulative action of heavy vehicle loads,environmental variations,and material aging,bridge compon... This research centers on structural health monitoring of bridges,a critical transportation infrastructure.Owing to the cumulative action of heavy vehicle loads,environmental variations,and material aging,bridge components are prone to cracks and other defects,severely compromising structural safety and service life.Traditional inspection methods relying on manual visual assessment or vehicle-mounted sensors suffer from low efficiency,strong subjectivity,and high costs,while conventional image processing techniques and early deep learning models(e.g.,UNet,Faster R-CNN)still performinadequately in complex environments(e.g.,varying illumination,noise,false cracks)due to poor perception of fine cracks andmulti-scale features,limiting practical application.To address these challenges,this paper proposes CACNN-Net(CBAM-Augmented CNN),a novel dual-encoder architecture that innovatively couples a CNN for local detail extraction with a CBAM-Transformer for global context modeling.A key contribution is the dedicated Feature FusionModule(FFM),which strategically integratesmulti-scale features and focuses attention on crack regions while suppressing irrelevant noise.Experiments on bridge crack datasets demonstrate that CACNNNet achieves a precision of 77.6%,a recall of 79.4%,and an mIoU of 62.7%.These results significantly outperform several typical models(e.g.,UNet-ResNet34,Deeplabv3),confirming their superior accuracy and robust generalization,providing a high-precision automated solution for bridge crack detection and a novel network design paradigm for structural surface defect identification in complex scenarios,while future research may integrate physical features like depth information to advance intelligent infrastructure maintenance and digital twin management. 展开更多
关键词 Bridge crack diseases structural health monitoring convolutional neural network feature fusion
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Comparative biomineralization of arsenite and arsenate driven by sulfate reduction in landfills 认领 引用
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作者 Feng Huang Xiaocui Xiao +3 位作者 Yuzhou Yang Yuyang Long Chengran Fang Lifang Hu 《ENGINEERING Environment》 SCIE EI CAS CSCD 2026年第2期185-202,共18页
Landfills,serving as the primary disposal sites for municipal solid waste,are increasingly recognized for their potential to contribute to arsenic(As)contamination.The As toxicity and mobility are closely associated w... Landfills,serving as the primary disposal sites for municipal solid waste,are increasingly recognized for their potential to contribute to arsenic(As)contamination.The As toxicity and mobility are closely associated with its chemical speciation,with inorganic As species—arsenate[As(Ⅴ)]and arsenite[As(Ⅲ)]—being the most prevalent and problematic.The transformation of these species poses substantial risks to both ecosystems and human health.This study delves into the biomineralization behaviors of As(Ⅴ)and As(Ⅲ)under the influence of sulfate-reducing bacteria(SRB)isolated from refuse.Results indicate that SRB facilitate the dissimilatory sulfate(SO42–)reduction process,converting SO42–to hydrogen sulfide(H2S)/hydrosulfide(HS–),which subsequently reacts with As(Ⅲ)to form insoluble arsenic-sulfide minerals like As2S3,AsS,and As4S4.As(Ⅲ)demonstrated a superior biomineralization potential,with mineralization rates reaching 16.09%(T3)and 20.43%(T4)in As(Ⅲ)-amended reactors,significantly exceeding those in As(Ⅴ)-amended reactors(T1 and T2).X-ray diffraction and scanning electron microscopy analyses confirmed the predominant formation of AsS in the presence of As(Ⅲ)reactor,while As(Ⅴ)reactor contributed to the formation of As4S4.Both environmental parameters,such as pH and SO42–concentration,and the microbial community composition critically influenced the As biomineralization behaviors.Metagenomic sequencing uncovered the pivotal roles of SRB and As(Ⅴ)-reducing bacteria,including Clostridium and Desulfitobacterium,in mediating SO42–reduction and the detoxification of As(Ⅴ).This research offers novel insights into the biomineralization mechanisms of As within landfills and lays a theoretical groundwork for the remediation of As pollution. 展开更多
关键词 Arsenic biomineralization Landfill SRB Metabolic pathways As2S3 As4S4
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Numerical Investigation of the Characteristics of Wind Loads on Offshore Photovoltaic(PV)Panels over Uneven Bottom Boundary 认领 引用
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作者 Yu Shen Yi Liu +3 位作者 Hanchen Zhang Liuyang Li Kaiming Pan Qinghe Fang 《Structural Durability & Health Monitoring》 EI 2026年第2期39-56,共18页
This study presents a systematic numerical analysis of wind loads on offshore photovoltaic(PV)panels.A computational fluid dynamics(CFD)model,incorporating a free-surface wave boundary condition,is developed and valid... This study presents a systematic numerical analysis of wind loads on offshore photovoltaic(PV)panels.A computational fluid dynamics(CFD)model,incorporating a free-surface wave boundary condition,is developed and validated against experimental data.Parametric investigations quantify the effects of wind speed,panel tilt angle,clearance,and wave characteristics on the aerodynamic coefficients(drag,lift,and moment).Results indicate that all force coefficients increase with wind speed,with the lift coefficient being most sensitive to wave action.While a larger tilt angle intensifies airflow disturbance and amplifies the coefficients,this effect is more pronounced over flat ground than above a wavy surface.As clearance increases,the drag coefficient fluctuates before rising,the lift coefficient exhibits a trough-shaped response,and the moment coefficient increases monotonically,with values consistently higher over waves.Furthermore,the aerodynamic coefficients generally decrease with greater wave height.The maximum wind load occurs directly above the wave trough,and the aerodynamic force coefficient varies non-monotonically with wave position,first decreasing and then increasing.These findings offer practical guidance for the structural design and safety assurance of offshore PV systems. 展开更多
关键词 Offshore PV numerical modelling wind load characteristics pressure coefficient aerodynamic forces
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A deep transfer learning model for the deformation of braced excavations with limited monitoring data 认领 引用 被引量：3
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作者 Yuanqin Tao Shaoxiang Zeng +3 位作者 Tiantian Ying Honglei Sun Sunjuexu Pan Yuanqiang Cai 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第3期1555-1568,共14页
The current deep learning models for braced excavation cannot predict deformation from the beginning of excavation due to the need for a substantial corpus of sufficient historical data for training purposes.To addres... The current deep learning models for braced excavation cannot predict deformation from the beginning of excavation due to the need for a substantial corpus of sufficient historical data for training purposes.To address this issue,this study proposes a transfer learning model based on a sequence-to-sequence twodimensional(2D)convolutional long short-term memory neural network(S2SCL2D).The model can use the existing data from other adjacent similar excavations to achieve wall deflection prediction once a limited amount of monitoring data from the target excavation has been recorded.In the absence of adjacent excavation data,numerical simulation data from the target project can be employed instead.A weight update strategy is proposed to improve the prediction accuracy by integrating the stochastic gradient masking with an early stopping mechanism.To illustrate the proposed methodology,an excavation project in Hangzhou,China is adopted.The proposed deep transfer learning model,which uses either adjacent excavation data or numerical simulation data as the source domain,shows a significant improvement in performance when compared to the non-transfer learning model.Using the simulation data from the target project even leads to better prediction performance than using the actual monitoring data from other adjacent excavations.The results demonstrate that the proposed model can reasonably predict the deformation with limited data from the target project. 展开更多
关键词 Braced excavation Wall deflections Transfer learning Deep learning Finite element simulation
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Investigation of Attention Mechanism-Enhanced Method for the Detection of Pavement Cracks 认领 引用 被引量：2
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作者 Tao Jin Siqi Gu +2 位作者 Zhekun Shou Hong Shi Min Zhang 《Structural Durability & Health Monitoring》 EI 2025年第4期903-918,共16页
The traditional You Only Look Once(YOLO)series network models often fail to extract satisfactory features for road detection,due to the limited number of defect images in the dataset.Additionally,most open-source road... The traditional You Only Look Once(YOLO)series network models often fail to extract satisfactory features for road detection,due to the limited number of defect images in the dataset.Additionally,most open-source road crack datasets contain idealized cracks that are not suitable for detecting early-stage pavement cracks with fine widths and subtle features.To address these issues,this study collected a large number of original road surface images using road detection vehicles.A large-capacity crack dataset was then constructed,with various shapes of cracks categorized as either cracks or fractures.To improve the training performance of the YOLOv5 algorithm,which showed unsatisfactory results on the original dataset,this study used median filtering to preprocess the crack images.The preprocessed images were combined to form the training set.Moreover,the Coordinate Attention(CA)attention module was integrated to further enhance the model’s training performance.The final detection model achieved a recognition accuracy of 88.9%and a recall rate of 86.1%for detecting cracks.These findings demonstrate that the use of image preprocessing technology and the introduction of the CA attention mechanism can effectively detect early-stage pavement cracks that have low contrast with the background. 展开更多
关键词 Road detection vehicle pavement crack detection deep learning attention mechanism
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Occurrence,characteristics and removal of microplastics in wastewater treatment plants with different treatment processes 认领 引用
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作者 Yiting Lian Xianwei Wang +2 位作者 Peng Sun Hua Wang Chengran Fang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第9期316-326,共11页
The abundance of microplastics(MPs)in wastewater from three wastewater treatment plants(WWTPs)were determined in Hangzhou,Zhejiang Province,China.The MPs abundance was 140-350 particles per litre in the influent and 1... The abundance of microplastics(MPs)in wastewater from three wastewater treatment plants(WWTPs)were determined in Hangzhou,Zhejiang Province,China.The MPs abundance was 140-350 particles per litre in the influent and 10-30 particles per litre in the effluent.Four shapes of MPs in the influent were observed,while mainly only debris was left in the effluent.The percentage of small(<100μm),medium(100-500μm),and large-sized(≥500μm)plastics in the raw leachate of the three WWTPs were 54.3%,8.6%,and 37.1%,28.6%,64.3%,and 7.1%,and 41.4%,24.1%,and 34.5%,respectively.Mainly only the size of≤100μm was left in the effluent of all.The removal efficiencies of MPs in a range of 78.6%to 96.6%were achieved.Polypropylene,polystyrene,polyethylene,polyethylene terephthalate and polyvinyl chloride were the main types and detected in all wastewater samples,accounting for over 75%of all types.The plastic components contained in different industrial wastewater were more complex.The distribution of MPs was significantly positively correlated with most conventional indicators such as chemical oxygen demead,ammonia nitrogen,and total phosphorus,but not with heavy metals.Similar wastewater,different treatment processes,or similar processes but different wastewater(industrial wastewater proportion varied)could all lead to differences in MPs removal.The MPs abundance measured in this experiment was similar to some previous studies,but relatively high.The three WWTPs can discharge up to 6.0×10-8-1.8×10-9 plastics of MPs per day,which poses potential ecological risks.This study indicates that the source control of MPs and optimizing the process design of existing WWTPs are crucial for preventing and controlling MPs pollution. 展开更多
关键词 Microplastics Abundance Removal efficiency Wastewater treatment plant Treatment process
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3D dynamic numerical modeling on vibration mitigation efficiency of open trench with horizontal hollow pipes 认领 引用
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作者 Hu Zhonghua Chen Qingsheng +2 位作者 Xu Changjie Sudip Basack Luo Wenjun 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2025年第3期795-809,共15页
Among different existing vibration isolation methods,open trenches is a technique that is commonly used for reducing the transfer of ground vibrations.Despite many benefits of such a technique for isolating ground vib... Among different existing vibration isolation methods,open trenches is a technique that is commonly used for reducing the transfer of ground vibrations.Despite many benefits of such a technique for isolating ground vibrations,its primary disadvantage is its instability and lack of vibration isolation effectiveness apart from the stability of the trenches.To address these concerns,a new technique has been developed by the authors,which includes filling up these trenches with a group of hollow pipes in a specific pattern.This is a novel method for reducing ground vibrations by burying hollow pipes horizontally.Through the use of three-dimensional(3D)finite-element modeling,the effectiveness of such hollow pipes in decreasing ground vibrations generated by harmonic stress excitation on the ground surface was investigated.Compared to open trench and rows of piles,these pipe assemblages have been shown to be very successful in reducing ground vibration transmission while also addressing issues of instability and enhancing vibration isolation efficiency.A 3D dynamic numerical model is constructed in PLAXIS3D,and the findings are validated against earlier publications.Next,a comparison research study is conducted,with its focus between horizontal hollow and vertical pipe piles.Finally,a detailed parametric study is carried out to establish the effect of each of the wave barrier’s architectural,material,and loading elements on its vibration isolation effectiveness.Critical parameters are discovered and tuned to maximize the efficiency of this new technique. 展开更多
关键词 ground vibrations hollow pipe vertical pipe pile vibration isolation
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Influence of the Buoyancy Section on the Mechanical Behavior of Deepwater Steel Lazy-Wave Risers 认领 引用
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作者 XU Pu HU Yi-ming +2 位作者 RUAN Wei-dong ZHENG Ji-xiang Ahad JAVANMARDI 《China Ocean Engineering》 SCIE EI CSCD 2025年第2期354-364,共11页
Steel lazy-wave riser(SLWR)is one of the key technical components of offshore oil-gas production systems and is widely utilized in deepwater areas.On the basis of the vector form intrinsic finite element(VFIFE)method,... Steel lazy-wave riser(SLWR)is one of the key technical components of offshore oil-gas production systems and is widely utilized in deepwater areas.On the basis of the vector form intrinsic finite element(VFIFE)method,this study develops a reasonable numerical model for the SLWR to investigate the effects of the buoyancy section on its mechanical characteristics.In the SLWR model,the buoyancy section is simulated using an equivalent riser segment with the same outer diameter and unit weight.The riser is considered to be composed of a series of space vector particles connected by elements,and virtual reverse motions are applied to establish the fundamental equations of forces and displacements.The explicit central difference technique is used to solve the governing equations for particle motion within the riser through programming implementation.To provide a detailed explanation of the process by which the SLWR achieves a stable lazy-wave configuration,a numerical model of a 2800-m-long riser is established at a water depth of 1600 m,and the feasibility of this model for riser behavior analysis is validated.The remarkable influences of the position,length,number and spacing of the buoyancy section on the mechanical behavior of the SLWR are observed,which provides a theoretical foundation for the optimal design of the SLWR in deepwaters. 展开更多
关键词 steel lazy-wave riser(SLWR) buoyancy section vector form intrinsic finite element(VFIFE) deepwater mechanical behavior
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High-efficient removal of tetracycline in water via porous magnetic Ce/Fe photocomposite under visible light 认领 引用 被引量：8
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作者 Weihang Han Jingxuan Shou +8 位作者 Yifan Yang Liangchen Chen Luping Zhang Yutong Chen Xuewei Tu Dan Jin Shijie Zhang Yurong Chang Hui Zheng 《Journal of Rare Earths》 SCIE EI CAS CSCD 2023年第10期1532-1540,I0003,共9页
Tetracycline is a typical antibiotic commonly used in various industries which is eco-toxic and quickly causes bacterial resistance.Therefo re,studying the efficient removal of tetracycline is necessary to protect the... Tetracycline is a typical antibiotic commonly used in various industries which is eco-toxic and quickly causes bacterial resistance.Therefo re,studying the efficient removal of tetracycline is necessary to protect the water environment.Herein,a novel Ce/Fe nanoparticle composite(1CCFO)was prepared by the sol-gel method and its removal effects of tetracycline under visible light were performed.The relationship between physicochemical properties of catalyst and photocatalytic degradation effects of tetracycline was analyzed based on a series of characterizations data such as X-ray diffraction(XRD),Raman spectro scopy,a vibrating sample magnetometer(VSM),scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET)method,X-ray photoelectron spectroscopy(XPS),and ultraviolet-visible(UV-Vis)spectroscopy.The results show that Ce/Fe photocatalyst possesses a large specific surface area,good visible light response,abundant oxygen vacancies and excellent redox performance,exhibiting good adsorption capacity,remarkable catalytic performance and stability.The optimal conditions for tetracycline removal were explored through orthogonal experiments.About 88%of tetracycline can be photodegraded in 1 h under optimal conditions.The possible decomposition pathways,main reactive oxygen species and suitable mechanism of the photocatalytic system were studied by liquid chromatography-mass spectro metry(LC-MS),an electron spin resonance(ESR)spectrometer and free radical quenching experiments.The results show that 1CCFO has an efficient degradation effect on tetracycline under visible light,which provides a feasible method to improve the performance of 1CCFO. 展开更多
关键词 Photocatalysis Degradation Tetracycline Fe-based photocatalyst Porous Rare earths
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Plasticity role in strength behavior of cement-phosphogypsum stabilized soils 认领 引用 被引量：8
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作者 Xia Bian Lingling Zeng +2 位作者 Feng Ji Ming Xie Zhenshun Hong 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第6期1977-1988,共12页
Dredged soil and phosphogypsum are frequently regarded as wasted materials,which require further treatment to control their environmental impact.Hence,phosphogypsum is proposed as a binder to stabilize dredged soil,ai... Dredged soil and phosphogypsum are frequently regarded as wasted materials,which require further treatment to control their environmental impact.Hence,phosphogypsum is proposed as a binder to stabilize dredged soil,aiming at efficiently reducing and reusing these waste materials.In this study,the engineering properties of cement-phosphogypsum stabilized dredged soils were investigated through a series of unconfined compression tests,and the effects of plasticity index of original soils on the strength improvement were identified.Then,the microstructure test and mineralogical test were performed to understand the mechanism of physical role of original soils in strength improvement.The results revealed that the unconfined compressive strength significantly decreased with the increase in plasticity index at the same binder content.The essential factor for strength improvement was found to be the formation of cementitious materials identified as calcium silicate hydrate(CSH),calcium aluminate hydrate(CAH),and ettringite(Aft).The normalized integrated intensity of cementitious materials(CSH+CAH+Aft)by pore volume decreased with the increase in plasticity index.Consequently,the density of cementitious materials filling the soil pores controlled the effectiveness of strength improvement.More cementitious materials per pore volume were observed for the original soils with lower values of plasticity index.That is,the higher strength of stabilized soils with lower values of plasticity index was attributed to a packed structure forming by integrated fabric through denser cementitious components.It can be anticipated from the above findings that the effectiveness of stabilization treatment will significantly reduce with the increase in plasticity of origin soil. 展开更多
关键词 Strength Stabilization Plasticity index Microstructure Mineralogical analysis
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Wetting-drying effect on the strength and microstructure of cementphosphogypsum stabilized soils 认领 引用 被引量：12
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作者 Lingling Zeng Xia Bian +1 位作者 Jiaxing Weng Tao Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第3期1049-1058,共10页
Phosphogypsum has often been used as an effective and environmentally friendly binder for partial replacement of cement,improving the engineering properties of slurries with high water content.However,the influence of... Phosphogypsum has often been used as an effective and environmentally friendly binder for partial replacement of cement,improving the engineering properties of slurries with high water content.However,the influence of phosphogypsum on the physicomechnical properties of stabilized soil subjected to wettingedrying cycles is not well understood to date.In this study,the effect of phosphogypsum on the durability of stabilized soil was studied by conducting a series of laboratory experiments,illustrating the changes in mass loss,pH value and unconfined compressive strength(qu)with wettingdrying cycles.The test results showed that the presence of phosphogypsum significantly restrained the mass loss in the early stage(lower than the 4th cycle),which in turn led to a higher qu of stabilized soil than that without phosphogypsum.After the 4th cycle,a sudden increase in mass loss was observed for stabilized soil with phosphogypsum,resulting in a significant drop in qu to a value lower than those without phosphogypsum at the 6th cycle.In addition,the qu of stabilized soils correlated well with the measured soil pH irrespective of phosphogypsum content for all wettingedrying tests.According to the microstructure observation via scanning electron microscope(SEM)and X-ray diffraction(XRD)tests,the mechanisms relating the sudden loss of qu for the stabilized soils with phosphogypsum after the 4th wetting-drying cycle are summarized as follows:(i)the disappearance of ettringite weakening the cementation bonding effect,(ii)the generation of a larger extent of microcrack,and(iii)a lower pH value,in comparison with the stabilized soil without phosphogypsum. 展开更多
关键词 Wetting-drying Phosphogypsum Microstructure Durability
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Monotonic uplift behavior of anchored pier foundations in soil overlying rock 认领 引用 被引量：6
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作者 Yizhou SUN Honglei SUN +2 位作者 Chong TANG Yuanqiang CAI Feng PAN 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2023年第7期569-583,共15页
Rock-embedded foundations with good uplift and bearing capacity are often used in mountains or hilly areas.However,there are soil layers with a certain thickness on the rocks in these mountainous areas,and the utiliza... Rock-embedded foundations with good uplift and bearing capacity are often used in mountains or hilly areas.However,there are soil layers with a certain thickness on the rocks in these mountainous areas,and the utilization of those soil layers is a problem worthy of attention in foundation construction.Considering construction-and cost-related factors,traditional single-form foundations built on such sites often cannot provide sufficient resistance against uplift.Therefore,an anchored pier foundation composed of anchors and belled piers,specifically constructed for such conditions,can be invaluable in practice.This paper introduces an experimental and analytical study to investigate the uplift capacity and the uplift mobilization coefficients(UMCs)of the anchored pier foundation.In this study,three in-situ monotonic pullout tests were carried out to analyze the load–displacement characteristics,axial force distribution,load transfer mechanism,and failure mechanism.A hyperbolic model is used to fit the load–displacement curves and to reveal the asynchrony of the ultimate limit states(ULSs)of the anchor group and the belled pier.Based on the results,the uplift capacity can be calculated by the UMCs and the anchor group and pier uplift capacities.Finally,combined with the estimation of the deformation modulus of the soil and rock,the verification calculation of the uplift capacity and UMC was carried out on the test results from different anchored pier foundations. 展开更多
关键词 Uplift capacity Anchored pier foundation Belled pier Rock anchor Uplift mobilization coefficient(UMC)
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An approach for determination of lateral limit angle in kinematic planar sliding analysis for rock slopes 认领 引用 被引量：2
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作者 Xiaojuan Yang Jie Hu +1 位作者 Honglei Sun Jun Zheng 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第4期1305-1314,共10页
Planar sliding is one of the frequently observed types of failure in rock slopes.Kinematic analysis is a classic and widely used method to examine the potential failure modes in rock masses.The accuracy of planar slid... Planar sliding is one of the frequently observed types of failure in rock slopes.Kinematic analysis is a classic and widely used method to examine the potential failure modes in rock masses.The accuracy of planar sliding kinematic analysis is significantly influenced by the value assigned to the lateral limit angleγlim.However,the assignment ofγlim is currently used generally based on an empirical criterion.This study aims to propose an approach for determining the value ofγlim in deterministic and probabilistic kinematic planar sliding analysis.A new perspective is presented to reveal thatγlim essentially influences the probability of forming a potential planar sliding block.The procedure to calculate this probability is introduced using the block theory method.It is found that the probability is correlated with the number of discontinuity sets presented in rock masses.Thus,different values ofγlim for rock masses with different sets of discontinuities are recommended in both probabilistic and deterministic planar sliding kinematic analyses;whereas a fixed value ofγlim is commonly assigned to different types of rock masses in traditional method.Finally,an engineering case was used to compare the proposed and traditional kinematic analysis methods.The error rates of the traditional method vary from 45%to 119%,while that of the proposed method ranges between 1%and 17%.Therefore,it is likely that the proposed method is superior to the traditional one. 展开更多
关键词 Kinematic analysis Block theory Planar sliding Lateral limit angle Rock slope
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On the seismic fortification intensity during succeeding use of the existing structure 认领 引用
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作者 丁伯阳 赵冬 +1 位作者 李通坤 曹亮 《Acta Seismologica Sinica(English Edition)》 2005年第6期727-731,共5页
In this paper, according to difference of the characteristics of the existing structure from design structure, the authors defined fortification intensity of the existing construction during succeeding use. It aims at... In this paper, according to difference of the characteristics of the existing structure from design structure, the authors defined fortification intensity of the existing construction during succeeding use. It aims at the enhancement of antiseismic administration in city reconstruction at present. Some decision methods (Method of equal intensity, method of equal probability of exceedance, method of equal occurrence ratio) for fortification intensity in succeeding use period of existing construction were provided to meet higher levels of seismic fortification criterion and changing use of buildings. With earthquake risk analysis, it is useful for discussion on antiseismic endurance of construction. 展开更多
关键词 existing structure succeeding use period intensity
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Comparison of UV and UV-LED activated sodium percarbonate for the degradation of O-desmethylvenlafaxine 认领 引用 被引量：1
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作者 Jing Deng Anhong Cai +5 位作者 Xiao Ling Qian Sun Tianxin Zhu Qingsong Li Xueyan Li Weizhu Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2023年第4期656-667,共12页
As an active metabolite of venlafaxine and emerging antidepressant,Odesmethylvenlafaxine(ODVEN) was widely detected in different water bodies,which caused potential harm to human health and environmental safety.In thi... As an active metabolite of venlafaxine and emerging antidepressant,Odesmethylvenlafaxine(ODVEN) was widely detected in different water bodies,which caused potential harm to human health and environmental safety.In this study,the comparative work on the ODVEN degradation by UV(254 nm) and UV-LED(275 nm) activated sodium percarbonate(SPC) systems was systematically performed.The higher removal rate of ODVEN can be achieved under UV-LED direct photolysis(14.99%) than UV direct photolysis(4.57%) due to the higher values of photolysis coefficient at the wavelength 275nm.Significant synergistic effects were observed in the UV/SPC(80.38%) and UV-LED/SPC(53.57%) systems and the former exhibited better performance for the elimination of ODVEN.The degradation of ODVEN all followed the pseudo-first-order kinetics well in these processes,and the pseudo-first-order rate constant(kobs) increased with increasing SPC concentration.Radicals quenching experiments demonstrated that both ·OH and CO3·-were involved in the degradation of ODVEN and the second-order rate constant of ODVEN with CO3·-(1.58 × 108(mol/L)-1sec-1) was reported for the first time based on competitive kinetic method.The introduction of HA,Cl-,NO3-and HCO3-inhibited the ODVEN degradation to varying degrees in the both processes.According to quantum chemical calculation,radical addition at the ortho-position of the phenolic hydroxyl group was confirmed to be the main reaction pathways for the oxidation of ODVEN by·OH.In addition,the oxidation of ODVEN may involve the demethylation,H-abstraction,OH-addition and C-N bond cleavage.Eventually,the UV-LED/SPC process was considered to be more cost-effective compared to the UV/SPC process,although the UV/SPC process possessed a higher removal rate of ODVEN. 展开更多
关键词 Advanced oxidation processes Sodium percarbonate Quantum chemical calculation Degradation pathways Electrical energy per order
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An Improved Approach for Interaction of Wave with Floating Spheres and Its Applications 认领 引用
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作者 LIU Can DONG Zhi-yong +2 位作者 PAN Yun TONG Huan-huan YANG li-jing 《China Ocean Engineering》 SCIE EI CSCD 2023年第1期115-130,共16页
To develop and utilize marine resources in the deep sea, the higher requirements for floating structures, which are operated in marine environment for a long term, have been put forward. Reasonable structure type and ... To develop and utilize marine resources in the deep sea, the higher requirements for floating structures, which are operated in marine environment for a long term, have been put forward. Reasonable structure type and accurate force analysis are favorable guarantees to improve the survival performance and working performance of the floating structures. Floating spheres fastened by mooring cable were widely used in floating structures. In this paper, the wave forces of the floating sphere are efficiently and accurately calculated by solving the geometric relationship between the non-submerged floating sphere and wave surface. Combined with the hydrodynamic calculation of mooring cables based on the lumped mass method, the coupled motion model of multi-floating spheres fastened by multi-mooring cable was established under wave action. Furthermore, according to the floating structures fastened by mooring cable in the actual ocean engineering, the topological method of multi-mooring cables fastening the multifloating spheres was expounded from simple to complex. Finally, the modeling method and preliminarily hydrodynamic characteristics of the fastened floating structures, including the mooring system of renewable energy devices, ocean buoy, and coral nursery, were presented and analyzed in detail. The obtained results showed that the method for calculating the wave force on the floating sphere developed in this paper can accurately describe the motion process of the floating mooring sphere and the force on the mooring cable. Also, the topological method of multiple buoys and multiple mooring cables could efficiently establish various numerical hydrodynamic models of fastened buoys in ocean engineering. 展开更多
关键词 floating sphere mooring cable wave forces hydrodynamic model ocean engineering
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