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Numerical Simulation and Experimental Study on Interlock Deformation for Roll Formed U-Section Steel Piling 认领 引用 被引量：2
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作者 FENG Guang-hong ZHANG Pei +2 位作者 ZHANG Hong-liang ZHOU Xu-chang ZHAO Yong 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2013年第11期41-45,共5页
The interlock of a roll formed U-section sheet steel piling under loading was analyzed by means of numeri- cal simulation, and meanwhile the tensile failure experiment was conducted. The results indicated that under t... The interlock of a roll formed U-section sheet steel piling under loading was analyzed by means of numeri- cal simulation, and meanwhile the tensile failure experiment was conducted. The results indicated that under the same load, the interlock corners of roll formed steel piling are not only the regions with the lowest safety factor, but also the regions with the highest stress; there are two slippages in the tensile instability process of interlock, Each slippage can be regarded as a failure, and different types of failure mode should be used to evaluate the performance of steel pilings according to different applications. Due to the work hardening effect during the roll forming process, the hardness of the interlock material increases by 16% compared with that of the original sheet steel. It was also found that the instability strength obtained in tensile failure test is only 15.6 % of the tensile strength of the original sheet steel. 展开更多
关键词 roll formed sheet steel piling interlock numerical simulation instability
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The Publication of the Piling Canon in the Late Qing 认领 引用
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作者 LIU Yi 《Cultural and Religious Studies》 2024年第9期566-574,共9页
Piling Canon refers to a woodblock-printed Chinese Buddhist Canon during the late Qing Dynasty.Despite its historical significance,it has received limited attention from the academia,as its discovery took place after ... Piling Canon refers to a woodblock-printed Chinese Buddhist Canon during the late Qing Dynasty.Despite its historical significance,it has received limited attention from the academia,as its discovery took place after the turn of the 21st century.This study explores the background,supervisor,proofreader,engravers,donors,and other factors that contributed to the publication of the Piling Canon.It was supervised by Buddhist monk Qingrong in Changzhou Tianning Monastery from 1908 to 1926,due to the commission of Yang Wenhui.By investigating the historical records in the colophons of Piling Canon,we found that engraving locations are distributed in Hubei,Yangzhou,and Danyang which engravers operated in groups;the majority of donors were found to be individuals and group forms,social fundraising was included as well.It is noteworthy that Sheng Xuanhuai made a significant contribution in terms of funding.Furthermore,the production of the Piling Canon confirms to the commence of Buddhism revival,as Buddhist scriptures in Jiangnan regions were almost destroyed after the Taiping Rebellion.The research shed light on extensive participation of cultural celebrities,diverse donation forms,and excellent engraving,offering a vivid depiction of Buddhist belief and social landscape in Jiangnan region. 展开更多
关键词 Piling Canon Buddhist scriptures Tianning Monastery donors Jiangnan
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Improvement of Technological Solutions for Sheet Piling Walls Made of U-Shape Piles 认领 引用
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《Journal of Civil Engineering and Architecture》 2017年第4期335-341,共7页
As it is evident from the practice of construction and maintenance of thin retaining walls, the degree of developing of frictional forces in interlock connections of steel sheet U-shape piles essentially influences th... As it is evident from the practice of construction and maintenance of thin retaining walls, the degree of developing of frictional forces in interlock connections of steel sheet U-shape piles essentially influences the realization of the values of geometric characteristics of the piles cross-section （the moment of inertia and the section modulus） reduced to the length unit of the construction. The article offers new and simple solutions for realization and economically effective technological approaches to provide joint work of the sheet piles being considered, which improve the adequacy of design and reliability of maintenance of thin retaining walls. 展开更多
关键词 Sheet piling walls steel U-shape piles interlock connections.
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Port and Marine Structures Made of Sheet Piling with Staggered Toe 认领 引用
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作者 Doubrovsky Michael Kaluzhnaya Valentina +3 位作者 Adamchuk Nikolay Khonelia Natela Kaluzhniy Aleksey Dubrovska Olga 《Journal of Shipping and Ocean Engineering》 2017年第4期168-173,共6页
Some new approaches to designing and calculation of maritime structures made of sheet piling with staggered toe are considered and discussed. Obtained results allow determination of piles spacing efficiency in stagger... Some new approaches to designing and calculation of maritime structures made of sheet piling with staggered toe are considered and discussed. Obtained results allow determination of piles spacing efficiency in staggered embedment wall. The specificity of interaction of piles in ＂comb＂ with the soil foundation Practical application is illustrated by example of calculation. regarding transition from continuous to ＂comb＂ wall is investigated. 展开更多
关键词 Sheet piling quay wall staggered toe driving depth.
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Optimal Piling Network Corrosion Protection System for Al-Zubair Harbor 认领 引用
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作者 Mohammed H. Hafiz Wisam K. Hamdan Ruaa Kaream Salman 《Journal of Surface Engineered Materials and Advanced Technology》 2012年第4期249-257,共9页
Cathodic protection is an effective electrochemical technique for preventing corrosion of metallic structures, for large structures like piles network impressed current cathodic protection (ICCP) system is usually pre... Cathodic protection is an effective electrochemical technique for preventing corrosion of metallic structures, for large structures like piles network impressed current cathodic protection (ICCP) system is usually preferred. The main aim of this study is to obtain the optimum protection potential that would provide a full cathodic protection for steel piles net-work immersed in sea water at Al-Zubair harbor. The effect of one immeasurable factor (path of anode (χ1)) and two measurable factors (position of anode (χ2) and voltage of power supply (χ3)) on protection potential are studied. Each factor has three different levels (high, medium, and low). Twenty-seven experiments were conducted based on a full factorial design of experiments. The results show that, a sufficient protection for three cathodes can be provided through the electrical circuit connecting them within the appropriate geometric shape.The protection potential is icreased with increasing the voltage of power supply and decreasing of distance between the anode and cathodes (piles network). 展开更多
关键词 Impressed Current Cathodic Protection Piles Network Path of Anode Position of Anode Optimal Combination
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Experimental study on the frost jacking characteristics of bamboo joint conical piles in seasonally frozen regions 认领 引用 被引量：1
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作者 YaoHui Zhang HaiHong Yang +1 位作者 TieCheng Sun Jiao Zhang 《Research in Cold and Arid Regions》 CAS CSCD 2026年第1期11-21,共11页
The variation in pile types can to some extent reduce frost jacking displacement of pile foundations in seasonal frost regions,yet further research is needed on the anti-jacking-up performance of different pile types ... The variation in pile types can to some extent reduce frost jacking displacement of pile foundations in seasonal frost regions,yet further research is needed on the anti-jacking-up performance of different pile types under freeze-thaw cycles.This study conducted freeze-thaw cycle model tests under open-system conditions based on the proposed design concept of bamboo joint conical piles,analyzing variations in test fill temperature,moisture content,surface displacement,and pile-top displacement.The main findings are:(1)Pile type variation significantly affects pile foundation frost jacking,with bamboo joint conical piles demonstrating superior anti-jacking-up performance compared to straight piles and inferior performance to 9°conical piles.Moreover,the anti-jacking-up performance of bamboo joint conical piles follows a pattern of initial enhancement followed by attenuation with increasing cone angle,where a 7°cone angle provides optimal anti-jacking-up performance.(2)The moisture content of the soil fill increases with the number of freeze-thaw cycles in an open system environment,with the rate of increase decreasing over time,while the initial frozen core volume within the fill material tends to increase during the thawing phase.(3)The mechanisms underlying the frost heave and settlement of the fill surface and the frost jacking displacement at the pile top were clarified.The frost heave and settlement of the fill surface result from volume changes in the frozen soil due to the water-ice phase transition and the compaction effect on unfrozen soil.The thermal melting evolution of the frozen core in the fill material is the key factor determining the cumulative displacement at the pile top.(4)Differences in the thermophysical properties between the pile foundation and the fill material induce the migration of free water toward the vicinity of the pile,where the higher moisture content of the fill material is detrimental to the mitigation of frost jacking damage to the pile foundation.These findings provide a foundation for further elucidation of the frost jacking mechanism of bamboo joint conical piles in seasonally frozen regions under freeze-thaw cycles. 展开更多
关键词 Freeze-thaw cycles Bamboo joint conical piles Frost jacking characteristics Model test Open system
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Study on the pullout bearing characteristics of bio-inspired root piles in coral sand foundation under different root buried depths 认领 引用
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作者 Xiangwei Fang Yaoyi Zhang +4 位作者 Zhiqiang Wang Peixi Xiong Fenghui Hu Ganggang Zhou Chunyan Wang 《Biogeotechnics》 2026年第2期75-84,共10页
Bio-inspired root pile(abbreviated as root pile)is a new type of bio-inspired foundation,which has a broad application prospect in the development and construction of China's South China Sea area due to its good b... Bio-inspired root pile(abbreviated as root pile)is a new type of bio-inspired foundation,which has a broad application prospect in the development and construction of China's South China Sea area due to its good bearing characteristics such as pullout bearing capacity.The effect of root buried depth on the uplift bearing characteristics of root piles is analyzed through the model test of uplift bearing of root piles with different root buried depths in coral sand foundation.The results show that increasing the root buried depth can improve the ability of the root pile to control the uplift displacement,and there exists an optimal buried depth or range of buried depths that can effectively improve the pile foundation's uplift bearing capacity and control the ultimate displacement.The attenuation of axial force at the root is in the form of a step;with the increase of root buried depth,the maximum value of lateral friction resistance develops from the lower part of the pile body without root to the upper part of the pile body without root.The range of the bearing ratio of the root section of the pile with root buried depth of 260 mm,340mm and 420mm is 12.33%–15.68%,9.98%–17.82%and 7.61%–21.65%,respectively;the smaller the root buried depth is,the higher is the ratio of the bearing ratio of the root section at the beginning of loading,and the bigger the root buried depth is,the bigger is the ratio of the root's final bearing ratio.The change of soil pressure around the pile increases and then decreases,and the densest point of soil compacting moves upward with the increase of root buried depth.The research results provide scientific basis for the design of root pile buried depth and root arrangement in actual projects. 展开更多
关键词 Bio-inspired root piles (Root pile) Coral sand Pullout resistance Root buried depth Bearing characteristic
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Field tests on compressive bearing capacity of cast-in-situ pile and pre-bored grouted PHC pile 认领 引用
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作者 Jiajin Zhou Rihong Zhang +2 位作者 Xiaonan Gong Jianlin Yu Tianlong Yan 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5759-5769,共11页
This paper presents a group of full-scale test results of cast-in-situ pile and pre-bored grouted prestressed high-strength concrete(PHC)pile(bored PHC pile)in deep soft soils.The pile shaft of castin-situ pile was ar... This paper presents a group of full-scale test results of cast-in-situ pile and pre-bored grouted prestressed high-strength concrete(PHC)pile(bored PHC pile)in deep soft soils.The pile shaft of castin-situ pile was arranged with strain sensors,and the bored PHC pile was arranged with both strain sensors and fiberoptic sensors.The side and base resistances of bored PHC pile and cast-in-situ pile were analyzed according to the fieldtest results.The research results showed that the 900 mmdiameter bored PHC pile revealed better compressive capacity compared to 1000 mm-diameter cast-insitu pile.The side resistance of bored PHC pile was also greater than that of cast-in-situ pile due to the existence of grout body.The expanding base grout body of bored PHC pile also improved its base resistance,as the base grouting process could increase base area and improve the properties of soil around pile base as well.The fieldtest results are valuable for the application of bored PHC pile and castin-situ pile in engineering practice. 展开更多
关键词 Cast-in-situ pile Bored pre-stressed high-strength concrete(PHC)pile Side resistance Base resistance Cone penetration test(CPT)method
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Kinematic analysis of pile in anisotropic poroelastic soil subjected to vertical incident S-waves 认领 引用
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作者 Zhiqing Zhang Xin Liu +2 位作者 Wenbing Wu Kaifu Liu Ernian Pan 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4895-4910,共16页
Anisotropic poroelastic media are comprehensively present in nature,exhibiting mechanical properties distinctly different from purely elastic media,primarily attributed to the coupled fluid–solid interactions within ... Anisotropic poroelastic media are comprehensively present in nature,exhibiting mechanical properties distinctly different from purely elastic media,primarily attributed to the coupled fluid–solid interactions within their porous microstructure.A novel model is developed for analyzing the kinematic characteristics of an end-bearing pile interacting with the surrounding anisotropic poroelastic soil under vertically incident shear waves.The surrounding soil is characterized as a transversely isotropic poroelastic medium following Biot's poroelastodynamic theory,while the embedded pile is assumed to comply with the Euler–Bernoulli beam theory.The problem is solved by combining the free-and scattered-field motions of the anisotropic poroelastic medium with the dynamic equilibrium equation of the pile.Model verification is conducted through comparison with existing results.Numerical examples unveil that soil anisotropy and pile slenderness ratio significantly influence the translational and rotational kinematic response factors of the pile,as well as the deformation distribution along the pile.Within a certain frequency range,the impact of the bulk modulus of pore fluid and soil permeability on the field quantities is also observed,along with the influencing mechanism of anisotropic parameters and pile slenderness ratio on the amplification/attenuation of the free-field lateral soil displacement in the r–z plane. 展开更多
关键词 Kinematic response Anisotropy Poroelastic soil End-bearing pile Vertically incident S-Wave
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Seismic behavior of pile group-supported bridges in liquefiable sloping ground covered with crusts:Insights from experimental observations 认领 引用
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作者 Kemin Jia Chengshun Xu +2 位作者 Junfeng Jia Chao Zhang Xiuli Du 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1781-1793,共13页
Pile group-supported bridges in liquefied sloping ground with crust are prone to severe damage.However,there remains a limited comprehension of the intricate interactions among pile group,soil,and superstructures,as w... Pile group-supported bridges in liquefied sloping ground with crust are prone to severe damage.However,there remains a limited comprehension of the intricate interactions among pile group,soil,and superstructures,as well as the associated failure mechanisms.To address this issue,this paper presents large-scale shaking table tests conducted on pile group-supported bridges in sloping liquefiable ground with crust to uncover the intricate interaction mechanisms.Firstly,the dynamic characteristics and interaction of the pile-soil-superstructure system were explored.Then,the lateral displacement and acceleration of the superstructure and pile were presented.Next,the curvature and damage characteristics of the pile group-supported bridge were discussed.Finally,through cross-correlation analysis,the study revealed the inertia and kinematic effects,focusing on how the effects influenced the seismic demands.Results indicate that significant differences are observed in pile-soil interactions during strong seismic events depending on the depth and liquefaction stage.As earthquake intensity increases,peak displacement in the superstructure rises linearly while residual displacement grows exponentially.Moreover,the pile group effect becomes more pronounced,especially at the pile head,with the trailing piles showing greater curvature than the leading ones.Due to significant soil lateral spreading and the shadowing effect within the pile group,the leading piles experience prominent kinematic effects from the surface down to the intermediate layer of saturated sand compared to the trailing piles.These findings contribute valuable insights for improving the seismic design approach for bridges with pile groups in sloping liquefied soils. 展开更多
关键词 Liquefiable soil Sloping ground Pile group Pile-soil-structure interaction Seismic behavior
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Pile installation effects in natural soft clays:A semi-analytical solution using strain path method 认领 引用
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作者 Liang Li Pan Zhou +3 位作者 Jingpei Li Seyedmohsen Miraei Peng Feng Mingdong Wei 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期728-744,共17页
This paper develops a semi-analytical solution for pile penetration in natural soft clays using the strain path method(SPM).The stress-strain behavior of soils is characterized by the S-CLAY1S model,which can capture ... This paper develops a semi-analytical solution for pile penetration in natural soft clays using the strain path method(SPM).The stress-strain behavior of soils is characterized by the S-CLAY1S model,which can capture the anisotropic evolution and destructuring nature of soft clays.By integrating the S-CLAY1S model into the theoretical framework of the SPM,a set of ordinary differential equations is formulated with respect to the vertical coordinate of soil particles.The distribution of excess pore water pressure(EPWP)following pile installation is approximated through one-dimensional(1D)radial integration around the pile shaft.The distribution of stresses and EPWP,along with the evolution of fabric anisotropy within the soil surrounding the pile,is presented to illustrate the response of pile penetration in natural soft clays.The proposed solution is validated against existing theoretical solutions using the SPM and cavity expansion method(CEM),along with experimental data.The findings demonstrate that the SPM reveals lower radial effective stresses and EPWP at the pile shaft than that of CEM.Pile penetration alters the soil's anisotropic properties,inducing rotational hardening and affecting post-installation stress distribution.Soil destructuration eliminates bonding among particles near the pile,resulting in a complete disruption of soil structure at the pile surface,which is particularly pronounced for higher initial soil structure ratios.Minimal variation was observed in the three principal stresses and shear stress on the cone side surface as the angle increased from 18°to 60°,except for a slight reduction in EPWP. 展开更多
关键词 Pile penetration Strain path method Natural soft clays Anisotropy evolution Destructuration
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Flow-pile interaction for landslides:Fluid simulation model 认领 引用
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作者 Yong Wu Zhangqing Wang +2 位作者 Yongjie Zhao Xinpo Li Yingpeng Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期2587-2603,共17页
Efficientsimulation of landslides and their interaction with piles is crucial for disaster reduction.Although the Savage-Hutter model is most prevalent in simulating landslides,it ignores viscosity when derived from f... Efficientsimulation of landslides and their interaction with piles is crucial for disaster reduction.Although the Savage-Hutter model is most prevalent in simulating landslides,it ignores viscosity when derived from fluidequations,which makes it deficientin dealing with landslides in different flowstates and their interactions with piles.Based on a detailed analysis of the Savage-Hutter model,this paper clarifiesthe model's limitations in simulating the interaction between landslides and solid piles.Then,a solid phase factor is introduced to characterize multiple flowstates to enhance the model's adaptability.Further,from the perspective of'flow-flow'coupling,the enhanced model describes the interaction between'flowstate'landslides and'solid state'piles while retaining the high computational efficiency of the depth-averaged method.Moreover,to deal with the cross-scale and large computations in the impact of landslides on piles,the discretization and solution of the model equations employ the finite volume method and localized mesh refinementtechnology to achieve both efficientcomputation and local high-precision simulation.Further combining the flumetest to calibrate the computational parameters,the research demonstrates through sets of cases the ability of the newly enhanced model to characterize the different'flowstates'of landslides and their interaction with'solid'piles,clarifying the baffleeffect of piles with different spatial layouts on landslide movement.Finally,by analyzing the Aidai landslide example in Sichuan,China,the study verifiedthe reliability of the improved"fluid-fluid"coupling model in addressing disaster and structural interaction issues at different scales,supporting disaster calculation and prevention technologies. 展开更多
关键词 Efficient simulation Different flow states landslides Fluid description of solid pile Depth averaged Fluid-fluid coupling
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Shaking table test for microbial coral sand pile composite foundations and coral sand foundations 认领 引用
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作者 Zhou Ganggang Fang Xiangwei +3 位作者 Shen Chunni Chen Zhixiong Bao Ting Yao Zhihua 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第2期379-391,共13页
Microbial induced calcium carbonate precipitation(MICP)is an eco-friendly technique that can effectively improve strength,stiffness,and liquefaction resistance.A microbial coral sand pile composite foundation is a nov... Microbial induced calcium carbonate precipitation(MICP)is an eco-friendly technique that can effectively improve strength,stiffness,and liquefaction resistance.A microbial coral sand pile composite foundation is a novel composite foundation technology that utilizes MICP technology to form local reinforcements in coral sand soil,resulting in the formation of microbial coral sand piles.Through a comparison of shaking table tests,the influence of microbial coral sand pile and acceleration amplitude on the dynamic characteristics of a coral sand foundation was discussed from four aspects:macroscopic liquefaction phenomenon,development of acceleration response,development of pore pressure and surface settlement.The test results showed that the peak acceleration amplification factor,excess pore water pressure ratio,and dynamic settlement of the composite foundation site were significantly reduced compared to those of the coral sand foundation.When the amplitude of the input sine wave was 0.2 g,the composite foundation did not liquefy but the coral sand foundation did.The acceleration amplitude of the composite foundation was greater than that of the coral sand foundation at the same depth.The dynamic liquefaction characteristics and strengthening effects of the microbial coral sand pile composite foundation and the MICP-treated coral sand foundation were analyzed and compared. 展开更多
关键词 coral sand microbial coral sand pile composite foundation shaking table test liquefaction
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Large-scale model tests on inclined steel pipe pile retaining structures upon excavation 认领 引用
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作者 Fei Gan Gang Zheng +8 位作者 Meilin Li Junhao Liu Haizuo Zhou Teng Cao Jing Bi Yuanyin Zhang Hongwei Liu Yigang Cen Hong Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4924-4939,共16页
The inclined alternating combination steel pipe pile retaining structure(IACSPPRS)is a cost-effective,environmentally friendly excavation-support system that offers advantages such as ease of construction and reusabil... The inclined alternating combination steel pipe pile retaining structure(IACSPPRS)is a cost-effective,environmentally friendly excavation-support system that offers advantages such as ease of construction and reusability.Despite its demonstrated performance in practice,research on its deformation and load-bearing mechanisms remains limited.This study presents large-scale model tests aimed at evaluating pile head displacements,bending moments,deformations,and axial force distributions during excavation.The findings indicate that,at equivalent excavation depths,IACSPPRS piles exhibit significantly reduced deformations compared to conventional cantilevered piles(CP),thereby demonstrating superior retaining performance.Furthermore,IACSPPRS benefits from the combined effects of tie-back action,gravity,and spatial structural interaction,leading to lower internal forces,reduced displacements,and improved overall stability.The system forms a spatially rigid frame,wherein the outer piles function as tensile anchors and the inner piles act as compressive struts,analogous to an internally braced support system in both load-bearing and deformation behavior.The combined effects of active friction on the outer piles,passive friction on the inner piles,and soil gravity contribute to enhanced anti-overturning capacity.Increasing the inclination angle between piles improves deformation resistance,with an optimal angle of about 20°under spatial constraints.The order of retaining performance effectiveness is as follows:vertical-inclined alternating composite piles(VICP),inclined-vertical alternating composite piles(IVCP),and inclined alternating composite piles(IICP). 展开更多
关键词 Excavations Inclined alternating combination steel pipe pile Braceless retaining structure Model tests
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Analysis and prediction on the long-term deformation of the tunnel foundation in diatomite stratum based on creep effect 认领 引用
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作者 ZHANG Huijian LIU Yongde +1 位作者 ZHENG Yuchao ZHANG Lela 《Journal of Mountain Science》 SCIE CSCD 2026年第5期2285-2303,共19页
Despite the unique properties of diatomite,relatively few studies have focused on its geotechnical engineering characteristics,especially those investigating the engineering performance of tunnel foundation pile treat... Despite the unique properties of diatomite,relatively few studies have focused on its geotechnical engineering characteristics,especially those investigating the engineering performance of tunnel foundation pile treatment technologies that account for the creep behavior of diatomite.This study is grounded on the Feifengshan Tunnel Project,a key component of the Hangzhou-Shaoxing-Taizhou High-Speed Railway.To address the geotechnical challenges of this project,the creep deformation behavior of diatomite under different saturation levels was investigated by combining laboratory creep tests and numerical simulations.Subsequently,a comparative analysis was conducted on the long-term deformation of tunnel foundations(LTDTF)in diatomite strata,with consideration of different reinforcement schemes.The findings reveal that under the same creep stress levels,the creep deformation of diatomite first decreases and then increases as saturation rises.Creep parameters obtained through the inversion of field monitoring and laboratory test data are more consistent with practical engineering conditions.The miniature steel pipe pile(MSPP)reinforcement technique improves the load-bearing capacity of tunnel foundations in diatomite strata.For tunnel foundations treated with MSPP,the LTDTF decreases by 70.6%in the 100th year after the completion of the secondary support construction.Furthermore,increasing the length(0-8 m)or diameter(0-150 mm)of MSPP can effectively control the magnitude and range of surrounding rock deformation at three key locations:the tunnel foundation(Point A),the horizontal observation line(Line B-C),and the vertical observation line(Line A-D).The findings provide crucial insights and a practical methodology for predicting and controlling long-term deformation in tunnel projects in diatomite strata. 展开更多
关键词 Diatomite strata Laboratory creep test Tunnel foundation Long-term deformation Steel pipe pile reinforcement Numerical simulation
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Effectiveness of large-diameter combined tip-and-side post-grouted piles in deep fine sand layers:A field test study 认领 引用
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作者 Zhihui Wan Zilong Guo +1 位作者 Guoliang Dai Feng Zhou 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3819-3831,共13页
This study investigates the effectiveness of combined tip-and-side post-grouting on large-diameter bored piles in deep fine sand layers.Field tests were conducted on nine piles for the Shishou Yangtze River Highway Br... This study investigates the effectiveness of combined tip-and-side post-grouting on large-diameter bored piles in deep fine sand layers.Field tests were conducted on nine piles for the Shishou Yangtze River Highway Bridge project.A detailed comparison of pile performance pre-and post-grouting assessed the technique's influence on ultimate bearing capacity and side resistance.The distribution and effectiveness of the cement grout were analysed using core drilling and the standard penetration test(SPT).An equation correlating post-grouting side resistance with the pre-grouting SPT index(NSPT)was established.Results demonstrate a substantial improvement in pile bearing capacity after grouting.Ultimate bearing capacity increased by 76%–152%after grouting.Longer piles on the main bridge exhibited more pronounced enhancement,achieving ultimate capacities 145%–206%higher than those of the shorter approach bridge piles.This is attributed to the greater total cement volume applied along their sides.Critically,combined grouting outperformed side-only grouting,enhancing both side and tip resistance.Core drilling confirmed the spread of cement grout around the piles,confirming the method's effectiveness.SPT results indicated significant increases in the soil NSPT adjacent to the piles following grouting.These findings provide directly applicable data for designing the bridge pile foundations and offer essential guidance for comparable projects in deep fine sand layers. 展开更多
关键词 Bored pile Combined post-grouting Static load test Core drilling test Standard penetration test(SPT) Deep fine sand layer
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Bearing behavior of six-pile thick pile caps under different reinforcement configurations 认领 引用
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作者 DAI Guoliang SHI Xiangyuan +1 位作者 GONG Zhiyu GONG Weiming 《Journal of Southeast University(English Edition)》 EI CAS 2026年第2期173-186,共14页
To investigate the bearing behavior and failure modes of six-pile thick pile caps under different reinforcement configurations and explore the optimal reinforcement scheme,this study examined four scaled specimens(S1-... To investigate the bearing behavior and failure modes of six-pile thick pile caps under different reinforcement configurations and explore the optimal reinforcement scheme,this study examined four scaled specimens(S1-S4)with distinct reinforcement designs.The bearing capacity of each pile cap was first calculated using various methods,and laboratory tests were then conducted to determine cracking and ultimate loads.Reinforcement stresses and key strain measurements in the pile caps were monitored,and the crack propagation process was documented in detail.The results demonstrate that the spatial truss model yielded calculations closest to experimental values.Specimen S3 with mesh reinforcement exhibited the highest bearing capacity but required greater steel consumption.The truss-reinforced S4 showed enhanced ductility at failure but posed constructability challenges.Uniformly reinforced S1 delivered the lowest bearing capacity and developed more uneven cracks.Furthermore,a comprehensive analysis of reinforcement stress distribution,internal force flow transfer,and the validity of the plane-section assumption at the pile-cap sides revealed that the mechanical behavior of the six-pile thick pile cap is more closely aligned with the spatial truss model.The concentrated reinforcement scheme at the pile head,as suggested by this model,proves to be an efficient and practical design solution. 展开更多
关键词 thick pile cap space truss model scale model
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Frost jacking behavior of photovoltaic support pile foundations under freeze-thaw cycles 认领 引用
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作者 ZHENG Chuanjie WANG Zilong +2 位作者 XIE Guangcai JIANG Songyu XING Shuang 《Journal of Mountain Science》 SCIE CSCD 2026年第5期2304-2322,共19页
During the operational period,frequent occurrences of frost heave and thaw settlement in pile foundations induced by frost heave forces have severely undermined the stability of the pile foundations.Current designs fo... During the operational period,frequent occurrences of frost heave and thaw settlement in pile foundations induced by frost heave forces have severely undermined the stability of the pile foundations.Current designs for PV pile foundations in cold regions often rely on experience from non-frost-susceptible areas or adopt excessively conservative solutions.Over the past three decades,due to discrepancies in experimental methods or insufficient fundamental test data,related research still faces numerous unresolved challenges,lacking mature,reliable,economical,and practical design solutions as well as a standard system for PV foundations in cold regions.To address this issue,this study developed a self-designed freeze-thaw cycling system based on laboratory model tests and numerical analysis,combined with practical engineering conditions.Frost heave model tests and numerical simulations were conducted on specially shaped pile foundations under multiple freeze-thaw cycles.By analyzing the evolution patterns of temperature,stress,and displacement fields in the frozen soil-pile foundation system,the influence of temperature,pile type,and number of freeze-thaw cycles on the frost heave-thaw settlement characteristics of pile foundations was investigated.Research findings indicate that:(1)Under the same freezing duration,temperature shows positive correlations with freezing depth and rate.Freezing temperature significantly affects pile uplift,with lower temperatures accelerating the uplift process.(2)Throughout the freeze-thaw cycles,tapered concrete piles demonstrate optimal frost resistance,reducing residual displacements by 40.98%and 55.98%compared to belled and uniform-diameter piles,respectively.After three freeze-thaw cycles,both cumulative frost jacking displacement and cumulative residual displacement tend to stabilize.(3)When the soil reaches the maximum ice front,the pile's side friction resistance also peaks.As the freezing temperature drops from-20℃ to-30℃,the absolute maximum side friction resistance increases by 21.3%.The depth range for maximum side friction resistance is 17-21 cm.Furthermore,side friction resistance shows an increasing trend with more freeze-thaw cycles.(4)Frost heave displacement under groundwater conditions is greater than without groundwater,with a 0.5-meter water level producing greater displacement than a 1-meter level.Therefore,in the design and construction of PV support pile foundations in seasonal frost regions,it is essential to consider cumulative frost heave displacement from multiple freeze-thaw cycles leading to uplift and tilting failures,and to minimize soil water content while cutting off water sources to achieve effective frost heave mitigation. 展开更多
关键词 Photovoltaic pile foundation Frost heave Repeated freeze-thaw cycles Model test Numerical simulations
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Effect of inertial and kinematic interaction on seismic behavior of cement-soil reinforced pile in liquefiable sites 认领 引用
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作者 YANG Song-song ZHANG Ding-wen +1 位作者 LI Hong-jiang WANG An-hui 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第1期202-223,共22页
A shaking table test was performed to investigate the different responses of piles with and without cement-soil reinforcement,considering both inertial and kinematic interactions.A comparison of the dynamic shear stre... A shaking table test was performed to investigate the different responses of piles with and without cement-soil reinforcement,considering both inertial and kinematic interactions.A comparison of the dynamic shear stress−strain hysteresis curves of soil profiles on the pile side with and without cement-soil reinforced piles indicates that cement-soil reinforced piles not only bear more tremendous shear stress but also have smaller strains under the action of cyclic shear stress.Furthermore,the cement-soil on the pile side not only shares part of the shear stress and modifies the bending moment distribution but also significantly enhances the resistance of the pile-side soil,reducing the lateral displacement of the superstructure.Cement-soil reinforcement reduced shear strains,inhibited sand liquefaction,and reduced superstructure displacements by 27%−47%(instantaneous)and 40%−65%(permanent).The proportion of horizontal load sharing between cement-soil reinforcement and saturated sand is considered,along with the change pattern of the subgrade reaction after sand liquefaction.An equivalent subgrade reaction calculation method is proposed,which accounts for the horizontal load-sharing ratios of soils with two different strengths.The test results indicate that the pile stress and displacement,estimated using the equivalent subgrade reaction,are in good agreement with the observed results. 展开更多
关键词 liquefaction cement-soil reinforced piles inertial force kinematic force equivalent subgrade reaction pseudo-static analysis
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Dynamic Behavior of Offshore Wind Turbines Considering Monopile Flexibility under Combined Wind,Wave and Soil 认领 引用
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作者 Shengya Liu Wei Bian +2 位作者 Linan Li Yang Xue Jingxun Yin 《Energy Engineering》 EI 2026年第9期25-45,共21页
Offshore wind energy plays a critical role in achieving global decarbonization goals,while the dynamic response mechanisms of megawatt-scale turbines under complex environmental conditions remain insufficiently charac... Offshore wind energy plays a critical role in achieving global decarbonization goals,while the dynamic response mechanisms of megawatt-scale turbines under complex environmental conditions remain insufficiently characterized.Current research often oversimplifies the effects of monopile flexibility and its interaction with soil dynamics,leading to gaps in dynamic predictions.To address this limitation,this study develops a comprehensive 15-degree-of-freedom dynamic model for a 22 MW monopile offshore wind turbine(OWT)that incorporates nonlinear pile flexibility and soil-structure interaction through p-y and Q-z curves.The integrated analytical framework,established using Euler-Lagrange equations,enables coupled analysis of aero-hydro-soil-structure interactions through systematic energy formulations.The simulation incorporates wind loads calculated via Blade Element Momentum theory and wave loads computed using Morison's equation based on linear Airy wave theory.The dynamic responses of the OWT system,including displacements and natural frequencies,are then systematically evaluated under combined wind,wave and soil loadings.Comparative analysis of dynamic responses under rigid,semi-rigid and flexible pile configurations reveals distinct behavioral mechanisms,highlighting the crucial role of pile flexibility in soil-structure interaction.The proposed methodology establishes a scalable framework for integrating soil models and control strategies in future research.These findings offer valuable insights for optimizing foundation designs through site-specific stiffness and damping considerations in megawatt-scale OWT engineering applications. 展开更多
关键词 Offshore wind turbine soil-structure interactions dynamic behavior pile flexibility
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