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Horizontal Bearing Capacity of Monocolumn Composite Bucket Foundations for Offshore Wind Turbines 认领 引用
1
作者 Hongyan Ding Renhao Wang +1 位作者 Puyang Zhang Conghuan Le 《哈尔滨工程大学学报（英文版）》 CSCD 2026年第1期162-174,共13页
Monocolumn composite bucket foundation is a new type of offshore wind energy foundation.Its bearing characteristics under shallow bedrock conditions and complex geological conditions have not been extensively studied.... Monocolumn composite bucket foundation is a new type of offshore wind energy foundation.Its bearing characteristics under shallow bedrock conditions and complex geological conditions have not been extensively studied.Therefore,to analyze its bearing characteristics under complex conditions-such as silty soil,chalky soil,and shallow bedrock-this paper employs finite element software to establish various soil combination scenarios.The load-displacement curves of the foundations under these scenarios are calculated to subsequently evaluate the horizontal ultimate bearing capacity.This study investigates the effects of shallow bedrock depth,the type of soil above the bedrock,the thickness of layered soil,and the quality of layered soil on the bearing characteristics of the monocolumn composite bucket foundation.Based on the principle of single-variable control,the ultimate bearing capacity characteristics of the foundation under different conditions are compared.The distribution of soil pressure inside and outside the bucket wall on the compressed side of the foundation,along with the plastic strain of the soil at the base of the foundation,is also analyzed.In conclusion,shallow bedrock somewhat reduces foundation bearing capacity.Under shallow bedrock conditions,the degree of influence on foundation bearing capacity characteristics can considerably vary on different upper soils.The thickness of each soil layer and the depth to bedrock in stratified soils also affect the bearing capacity of the foundation.The findings of this paper provide a theoretical reference for related foundation design and construction.In practice,the bearing performance of the foundation can be enhanced by improvingthe soil quality in the bucket,adjusting the penetration depth,adjusting the percentage of different types of soil layers in the bucket,and applying other technical construction methods. 展开更多
关键词 Monocolumn composite bucket foundations Shallow bedrock Bearing characteristics Offshore wind power Silty soil Chalky soil
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An up-to-Date Review on Structural Design and Optimization of Offshore Jacket Foundations 认领 引用
2
作者 HAN Mu-xuan DU Zun-feng +3 位作者 ZHU Hai-ming YUAN Qiu-yu ZHU Hai-tao LI Yancang 《China Ocean Engineering》 SCIE EI CSCD 2026年第2期231-249,共19页
The utilization of marine resources has become a strategic priority of global significance.Offshore platforms and offshore wind turbines are critical components of offshore energy development systems.To address the co... The utilization of marine resources has become a strategic priority of global significance.Offshore platforms and offshore wind turbines are critical components of offshore energy development systems.To address the complexity,randomness,and uncertainty inherent in the marine environment and to ensure the safety of offshore installations during service,structural analysis and optimization of their foundations are essential.Jacket foundations,which provide high rigidity and stability,are suitable for shallow water and have emerged as the preferred foundation type for deepwater offshore installations.This study systematically reviews recent advances in theoretical modeling,numerical simulation,and experimental validation of structural response analyses and optimization methodologies for jacket foundations under complex marine conditions.Driven by diverse engineering requirements,researchers have proposed various structural optimization strategies.Existing efforts have primarily focused on structural topology,lightweight design,and performance-based optimization.Furthermore,this review identifies key technical challenges and outlines future research directions for optimizing offshore jacket foundations in ocean engineering. 展开更多
关键词 ocean engineering offshore installations jacket foundation performance analysis design optimization
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Experimental Study on Local Scour Around Suction Bucket Foundations in Silty Clay Induced by Unidirectional Currents 认领 引用
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作者 GUAN You-hai YANG Zhao-hui +4 位作者 LIANG Kai-xin LYU Huan-yu HU Jin-cheng WANG Bo ZHAO Meng 《China Ocean Engineering》 SCIE EI CSCD 2026年第2期428-442,共15页
Motivated by a real-world engineering project,this study explores the temporal development of scour depth and the morphology of scour pits around suction bucket foundations in silty clay subjected to unidirectional cu... Motivated by a real-world engineering project,this study explores the temporal development of scour depth and the morphology of scour pits around suction bucket foundations in silty clay subjected to unidirectional currents,through controlled laboratory flume experiments.The findings indicate that:(1)the maximum scour depth of the triple suction bucket foundation demonstrates substantial variation around the threshold flow velocity for silty clay Uc=0:4 m/s.Within a specific range,scour depth exhibits inverse relationship with bucket spacing and aspect ratio,while showing direct proportionality to flow velocity and exposed soil height.A robust functional relationship exists between scour depth and time under various conditions.The scour pit depth varies between the front and rear buckets,as well as between the inner and outer sides of the rear bucket.The disparity in scour depth between the rear and front buckets increases with rising flow velocity.(3)Analysis of field survey data from the engineering site reveals that the experimental results deviate smaller than 12%from the observed average scour pit depth,demonstrating strong correlation with actual conditions.Additionally,a proportional relationship between scour pit depth and width is derived from the field data,offering guidance for scour assessment and protection of triple suction bucket foundations in deep-sea silty clay environments. 展开更多
关键词 flume experiment local scour suction bucket foundation on-site survey validation
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Experience-guided optimization of jacket foundations for offshore wind turbines in varying water depths based on finite element analysis and the genetic algorithm 认领 引用
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作者 Jiajia HUANG Tao JIN +6 位作者 Jianwu HUANG Shasha SONG Wei DAI Chaoqun ZUO Lizhong WANG Lilin WANG Zhen GUO 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2026年第3期183-199,共17页
Structural optimization plays a crucial role in reducing the cost of offshore wind power,particularly in deep-water regions where the weight of jacket foundations increases substantially.However,there is ongoing debat... Structural optimization plays a crucial role in reducing the cost of offshore wind power,particularly in deep-water regions where the weight of jacket foundations increases substantially.However,there is ongoing debate regarding the water-depth range that is suitable for jacket foundations,and the threshold where floating foundations become more viable.Existing studies have not quantitatively analyzed how water depth affects jacket foundation mass,and have often struggled to handle the high dimensionality and stringent constraints inherent in jacket foundation optimization problems.In this study,we propose an optimization framework that couples parametric finite element analysis with a genetic algorithm to minimize the mass of jacket foundations based on three actual engineering projects at varying water depths.A novel population initialization strategy incorporating engineering experience-based solutions is introduced to improve convergence efficiency and solution quality.Comparative analysis against preliminary designs and existing offshore wind projects demonstrates the model’s ability to achieve cost-effective solutions,specifically reducing required jacket masses by 18.66%,20.98%,and 17.22%at depths of 30.06,60.23,and 89.81 m,respectively.The results reveal a 122.94%increase in jacket mass—from 1431.28 to 3190.90 t—as water depth increases from 30.06 to 89.81 m.The jacket foundation demonstrates superior cost effectiveness in shallow to moderate water depths,as the unit weight per megawatt(MW)of floating foundations is 97.51%and 35.74%higher at water depths of 60.23 and 89.81 m,respectively.Accordingly,the applicable water-depth threshold between the jacket and floating foundations is estimated to be approximately 100 m.The proposed optimization model offers a novel methodology and practical insights for the optimal design of offshore wind turbine support structures in varying marine environments. 展开更多
关键词 Structural optimization Jacket foundation Genetic algorithm Offshore wind power Population initialization Parametric modeling
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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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Foundations and Extensions of Logic—An Interview with Timothy Williamson 认领 引用
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作者 Hu Liu Xuefeng Wen Yuan Ren 《逻辑学研究》 CSSCI 2026年第3期127-155,共29页
Timothy Williamson is one of the most influential contemporary analytic philosophers.He serves as the Wykeham Professor of Logic at the University of Oxford and is a fellow of New College,Oxford.His research has deepl... Timothy Williamson is one of the most influential contemporary analytic philosophers.He serves as the Wykeham Professor of Logic at the University of Oxford and is a fellow of New College,Oxford.His research has deeply shaped several core areas of philosophy,including philosophical logic,epistemology,metaphysics,and the philosophy of language.He is particularly renowned for three major contributions. 展开更多
关键词 extensions williamson philosopher foundations logic wykeham interview timothy
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The Historical Foundations and Inevitable Choice of the Peaceful Liberation of Xizang 认领 引用
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作者 Zhang Yongpan Ye Ziwei 《China's Tibet》 2026年第3期12-17,共6页
Xizang has,since ancient times,been an inseparable part of China's territory.The peaceful liberation of Xizang is one of the important events in Chinese history.In 1951,the signing of the"Agreement of the Cen... Xizang has,since ancient times,been an inseparable part of China's territory.The peaceful liberation of Xizang is one of the important events in Chinese history.In 1951,the signing of the"Agreement of the Central People's Government and the Local Government of Xizang on Measures for the Peaceful Liberation of Xizang"(hereinafter referred to as the"Seventeen-Article Agreement")marked a symbolic event of Xizang's formal return to the big family of the motherland. 展开更多
关键词 historical foundations Chinese history peaceful liberation seventeen article agreement Xizang
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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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Research on Several Issues of Pile Foundations for Dynamic Machinery in Soft Soil Areas 认领 引用
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作者 Qing Chen 《Journal of World Architecture》 2026年第1期56-64,共9页
The selection of foundation dynamic characteristic parameters is one of the difficulties in the design of dynamic machinery foundations,and the pile foundations for dynamic machinery in soft soil areas have certain pa... The selection of foundation dynamic characteristic parameters is one of the difficulties in the design of dynamic machinery foundations,and the pile foundations for dynamic machinery in soft soil areas have certain particularities.Taking the research on the vibration problem of a dryer foundation in Shanghai as an example,this paper discusses several key issues in the design of pile foundations for dynamic machinery in soft soil areas.Suggestions are put forward for the selection of key parameters,such as vertical compressive stiffness and shear stiffness of pile foundations,as well as for the design of such pile foundations in soft soil areas,which can provide reference for similar engineering designs and research. 展开更多
关键词 Foundation dynamic characteristic parameters Soft soil areas Foundation vibration
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AlphaEarth Foundations:遥感基础大模型的潜力与挑战 认领 引用 被引量：3
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作者 秦其明 《地球信息科学学报》 EI CSCD 北大核心 2025年第10期2283-2290,共8页
【目的】随着全球在轨地球观测卫星数量的快速增长,遥感数据呈现爆炸式积累,为地球系统科学研究提供了动态认知全球变化的前所未有机遇;与此同时,也伴生多源异构、标注稀缺、任务泛化不足与数据过载等一系列挑战。【方法】为应对这些瓶... 【目的】随着全球在轨地球观测卫星数量的快速增长,遥感数据呈现爆炸式积累,为地球系统科学研究提供了动态认知全球变化的前所未有机遇;与此同时,也伴生多源异构、标注稀缺、任务泛化不足与数据过载等一系列挑战。【方法】为应对这些瓶颈问题,Google DeepMind提出了AlphaEarth Foundations(AEF),通过整合光学、SAR、LiDAR、气候模拟及文本等多模态数据,构建统一的64维嵌入表征场,实现了跨模态、跨时空的语义一致性的数据融合,并在Google Earth Engine等平台开放。【结果】AEF的主要贡献体现在:①缓解了长期存在的“数据孤岛”问题,建立了全球一致的嵌入层;②通过vMF球面嵌入机制提升了语义相似性度量能力,支持高效的检索与变化检测;③将复杂的预处理与特征工程前置于预训练阶段,使下游应用进入“分析就绪”状态,大幅降低了应用成本。论文指出,AEF的应用潜力释放可分为3个阶段:首先是地表覆盖分类与变化检测;其次是嵌入向量与物理模型深度耦合,推动科学发现;最后有望演化为空间智能基座,成为全球地理空间智能服务的一种基础设施。尽管如此,AEF仍面临若干挑战:①嵌入向量可解释性不足,限制了科学归因和因果分析;②域迁移与跨场景适应性存在不确定性,极端环境下的鲁棒性有待验证;③性能优势需要更多跨区域、独立实验的实证支撑。【结论】AEF以其在数据效率和跨任务泛化方面的突破,代表了遥感与地理空间人工智能研究的新方向,为未来地学研究提供了坚实支撑,但其进一步发展依据可解释性、鲁棒性及真实性验证的持续提升,并将64维嵌入向量通过不同途径转化为可广泛使用的数据资源。 展开更多
关键词 AlphaEarth Foundations 遥感基础大模型 多模态融合 嵌入表征 时空建模
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Traditional Solution for Foundations in a Lake Environment:Case of the Village Ganviéin the Republic of Benin 认领 引用
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作者 Babilas Hountondji Lambert KAyitchéhou +1 位作者 François de Paule Codo Martin PAina 《Journal of Environmental & Earth Sciences》 CAS 2025年第3期316-328,共13页
The problems noted in the structures built on wooden foundation piles in a lake environment required various works to strengthen over time.This work mainly consists of the recovery of the foundation mass by micropiles... The problems noted in the structures built on wooden foundation piles in a lake environment required various works to strengthen over time.This work mainly consists of the recovery of the foundation mass by micropiles due to the increase in loads on the structures,or the recovery of the foundation mass by injection,which is carried out when voids form between the ground and the wooden foundation elements.The high cost of foundation reinforcement methods led the National Agency for the Development of Tourist Heritage in Benin(ANPT)to replace the wooden foundation piles with reinforced concrete piles in the implementation of the project“reinventing the lakeside city of Ganvié”.This article presents an artisanal technology for the creation of reinforced concrete foundation piles in a lake environment.On-site examples made it possible to evaluate the performance of this artisanal implementation technique.The installation of these piles is carried out following manual drilling,followed by the installation of reinforcement and the pouring of concrete on site.The implementation of reinforced concrete foundation piles in place of the wooden ones studied in this article only impacted the infrastructure of the homes of the lakeside town of Ganviébut not the superstructure,which preserved the old traditional wooden architecture and thatched roofs.Thus,the ambition to move this city of Ganviéfrom the stage of a lake village to that of a floating city is very successful.This will contribute to improving the environment and living conditions of the populations and will promote economic development through tourism. 展开更多
关键词 Wooden Foundation Piles Disorder of Foundations Reinforcement of Foundations Manual Drilling Reinforced
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Horizontal bearing capacity of post-expanded arm grouting pile foundations 认领 引用
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作者 Wenbo Zhu Guoliang Dai +3 位作者 Huiyuan Deng Bo Liu Liji Huang Yingying Zhao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第6期3845-3860,共16页
In order to effectively improve the horizontal bearing capacity of pile foundations,this study proposes post-expanded arm grouting technology and associated pile foundations.The horizontal bearing characteristic of th... In order to effectively improve the horizontal bearing capacity of pile foundations,this study proposes post-expanded arm grouting technology and associated pile foundations.The horizontal bearing characteristic of the post-expanded arm grouting pile was explored through model tests.The test results indicate that the post-expanded arm grouting pile can increase the contact area between the pile and soil,and can improve the strength of the soil.The horizontal bearing capacity of the post-expanded arm grouting pile was approximately 3 times that of the conventional pile.It also shows that the larger the plate diameter ratio or grouting volume,the higher the horizontal bearing capacity of the post-expanded arm grouting pile.The maximum bending moment of the post-expanded arm grouting pile was located at the pile plate,and the displacement zero point of the new pile was higher than that of the conventional pile.The soil resistance at the pile plate was significantly higher than that of conventional piles,indicating that the pile plate effectively enhances the soil resistance.The improved p-y curve model and horizontal bearing capacity calculation method for the post-expanded arm grouting pile were proposed by considering the pile plate diameter factor.This method was finally verified by experimental results.The results of this study can provide a reference for calculating the horizontal bearing capacity of the post-expanded arm grouting pile. 展开更多
关键词 Pile foundations Post-grouting Expanded arm pile Improvement of bearing capacity p-y curve model
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Dynamic Response of Bridge Pile Foundations under Pile-Soil-Fault Interaction in Seismic Areas 认领 引用
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作者 Yujie Li Zhongju Feng +2 位作者 Fuchun Wang Jiang Guan Xiaoqian Ma 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第5期1549-1573,共25页
To study the dynamic response rules of pile foundations of mega-bridges over faults in strong seismic areas,a finite element model of the pile foundation-soil-fault interaction of the Haiwen Bridge is established.The ... To study the dynamic response rules of pile foundations of mega-bridges over faults in strong seismic areas,a finite element model of the pile foundation-soil-fault interaction of the Haiwen Bridge is established.The 0.2-0.6 g peak acceleration of the 5010 seismic waves is input to study the effect of the seismic wave of different intensities and the distance changes between the fault and the pile foundation on the dynamic response of the pile body.The results show that the soil layer covering the bedrock amplifies the peak pile acceleration,and the amplifying effect decreases with increasing seismic wave intensity.However,bedrock has less of an effect on peak acceleration.The relative pile displacement shows the mechanical properties of elastic long piles.The pile foundation generates a large bending moment at the bedrock face and the upper soil layer interface,and a large shear force at the pile top and the soft-hard soil body interface.The relative displacement,bending,and shear bearing characteristics of the pile foundations on the upper and lower plates of the fault are significantly different.The deformation characteristics are affected by faults in a region ten times the pile diameter.Analysis of the dynamic p-y curves shows that the soil resistance on the pile side of the lower plate at the same depth is greater than that of the upper plate.Sensitivity of the dynamic response of pile foundations on either side of the fault to the effects of seismic intensity and distance between the pile foundation and the fault:distance l seismic intensity q. 展开更多
关键词 Bridge pile foundation seismic response fault upper plate effect mechanical behavior numerical simulate
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Combined recovery technology of pile foundations for offshore wind turbines 认领 引用
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作者 DING Hongyan TIAN Xiaoxuan +2 位作者 ZHANG Puyang XIN Lianshuo LE Conghuan 《Journal of Southeast University(English Edition)》 EI CAS 2025年第4期465-472,共8页
In recent years,offshore wind turbines have rap-idly developed,and many pile foundations installed earlier are now approaching decommissioning.Thus,the efficient removal of pile foundations has become a critical issue... In recent years,offshore wind turbines have rap-idly developed,and many pile foundations installed earlier are now approaching decommissioning.Thus,the efficient removal of pile foundations has become a critical issue for the sustainable development of offshore wind energy.To ad-dress this issue,this paper systematically investigates three methods for the recovery of pile foundations using physical model experiments:water injection+lifting,air injection+lifting,and air retention+water injection.The experimental results show that the water injection+lifting method exhibits remarkable advantages in recovering large-diameter and in-clined pile foundations;however,realigning inclined piles during recovery remains challenging,and a risk of pile over-turning exists.The air injection+lifting method proves ef-fective for realigning inclined piles but presents a risk of air expulsion failure,which may affect the continuity and stabil-ity of the recovery process.By contrast,the air retention+water injection method combines the characteristics of water injection and air injection techniques,effectively avoiding air expulsion failure and exhibiting pronounced displacement jumps during pile uplift.These findings provide a valuable reference for future decommissioning practices of offshore wind pile foundations,offer important engineering applica-tion value,and contribute positively to the sustainable devel-opment of the offshore wind industry. 展开更多
关键词 offshore wind turbine pile foundation recov-ery physical model experiment
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Study on band gaps and defect bands in tunable phononic crystal plates with elastic foundations 认领 引用
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作者 HONG Jun GAO Xingyu +1 位作者 LI Ke WANG Shaopeng 《Journal of Southeast University(English Edition)》 EI CAS 2025年第2期164-170,共7页
To analyze the band gap characteristics of phononic crystals,a two-dimensional phononic crystal plate model with an elastic foundation was first established.The plane wave expansion method was used to compute the disp... To analyze the band gap characteristics of phononic crystals,a two-dimensional phononic crystal plate model with an elastic foundation was first established.The plane wave expansion method was used to compute the dispersion curves of this phononic crystal model,and the results were compared with those from the finite element method to verify their accuracy.Subsequently,a parameter study explored the effects of the elastic foundation coeffi-cient and coverage ratio on the band gap.The results indicate that as the coverage ratio of the elastic foundation increases,the band gap significantly expands,reaching its maximum value at 100%coverage.Additionally,as the elastic foundation stiffness increases,the band gap gradually widens and converges toward fixed boundary conditions.The study also investigated the band gap of phononic crystal plates with defects,finding that the vibrational energy concentrates at the defect unit cell.Furthermore,the defect band frequency can be effectively modulated by adjusting the coefficient of the elastic foundation,providing a theoretical basis for achieving efficient energy conversion. 展开更多
关键词 phononic crystals elastic foundation band gap plane wave expansion method defect band
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Seismic response of existing stone masonry structures on soft soil foundations 认领 引用
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作者 Xin Zhao Haojiang Shang Yingxiong Wu 《Earthquake Research Advances》 CSCD 2025年第3期88-99,共12页
The coastal region of Fujian contains numerous existing stone masonry structures,many of which are constructed on soft soil sites.Previous studies have shown that the soil-structure interaction(SSI)effect on soft soil... The coastal region of Fujian contains numerous existing stone masonry structures,many of which are constructed on soft soil sites.Previous studies have shown that the soil-structure interaction(SSI)effect on soft soil foundations can prolong the structure's natural vibration period and enhance its seismic response.We develops a soilstructure interaction system model and a comparative rigid foundation model using the finite element software LS-DYNA to investigate the impact of SSI on the dynamic characteristics and seismic response of stone structures.The results indicate that the SSI effect alters stone structures'dynamic properties and seismic response.This alteration is evident in the extended natural vibration period,which reduces overall stiffness,increases interstory displacement angles,and slightly decreases the acceleration response.Under both SSI and FIX systems,the structural failure mode is characterized by the external collapse of the second-story stone walls,which causes the roof stone slabs to lose support and fall,leading to overall collapse.The FIX system demonstrates better structural integrity and stability with slower crack development.In contrast,the SSI system exhibits cracks that appear earlier and develop more rapidly,causing more severe damage.The research findings provide a theoretical basis for the seismic reinforcement of existing stone structures on soft soil foundations. 展开更多
关键词 Stone structure Soft soil foundation Soil-structure interaction Seismic response LS-DYNA
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Strengthening the Judicial Foundations of Shared Values of Mankind 认领 引用
17
《International Understanding》 2025年第2期20-21,共2页
On the afternoon of May 3Oth,the parallel forum"Strengthening the Judicial Foundations of Shared Values of Mankind,"as a component of the 4th Dialogue on Exchanges and Mutual Learning among Civilisations,was... On the afternoon of May 3Oth,the parallel forum"Strengthening the Judicial Foundations of Shared Values of Mankind,"as a component of the 4th Dialogue on Exchanges and Mutual Learning among Civilisations,was held in Dunhuang.More than 50 experts and scholars from nine countries,including China,Germany and the United Kingdom,engaged in in-depth discussions on the topic. 展开更多
关键词 mutual learning parallel forumstrengthening judicial foundations shared values shared values parallel forum exchanges exchanges mutual learning th dialogue mankind
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Experimental and Numerical Study on Local Scour of Pile Group Foundations for Offshore Wind Turbines Under Wave-Current Interactions 认领 引用 被引量：3
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作者 YU Heng ZHANG Yu-hang +1 位作者 JIA Jia-yu ZHANG Jin-feng 《China Ocean Engineering》 SCIE EI CSCD 2025年第3期493-503,共11页
Under the combination of currents and waves, seabed scour occurs around offshore wind turbine foundations, which affects the stability and safe operation of offshore wind turbines. In this study, physical model experi... Under the combination of currents and waves, seabed scour occurs around offshore wind turbine foundations, which affects the stability and safe operation of offshore wind turbines. In this study, physical model experiments under unidirectional flow, bidirectional flow, and wave-current interactions with different flow directions around the pile group foundation were first conducted to investigate the development of scour around the pile group foundation.Additionally, a three-dimensional scour numerical model was established via the open-source software REEF3D to simulate the flow field and scour around the prototype-scale foundation. The impact of flow on scour was discussed.Under unidirectional flow, scour equilibrium was reached more quickly, with the maximum scour depth reaching approximately 1.2 times the pile diameter and the extent of the scour hole spanning about 4.9 times the pile diameter.Compared with those under unidirectional flow, the scour depths under combinations of currents and waves, as well as bidirectional flow, were slightly smaller. However, the morphology of scour holes was more uniform and symmetrical. The numerical simulation results show good agreement with the experimental data, demonstrating the impact of varying flow directions on the velocity distribution around the foundation, the morphology of scour holes, and the location of the maximum scour depth. 展开更多
关键词 offshore wind turbines pile group foundation local scour wave-current interaction numerical simulation
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Undrained bearing capacity of obliquely-eccentrically loaded shallow foundations overlying a heterogeneous and inherently anisotropic clay deposit 认领 引用 被引量：1
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作者 Maedeh Nasiri Pishvari Hessam Fathipour +3 位作者 Suraparb Keawsawasvong Boonchai Ukritchon Meghdad Payan Reza Jamshidi Chenari 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第1期586-613,共28页
Clay deposits typically exhibit significant degrees of heterogeneity and anisotropy in their strength and stiffness properties.Such non-monotonic responses can significantly impact the stability analysis and design of... Clay deposits typically exhibit significant degrees of heterogeneity and anisotropy in their strength and stiffness properties.Such non-monotonic responses can significantly impact the stability analysis and design of overlying shallow foundations.In this study,the undrained bearing capacity of shallow foundations resting on inhomogeneous and anisotropic clay layers subjected to oblique-eccentric combined loading is investigated through a comprehensive series of finite element limit analysis(FELA)based on the well-established lower-bound theorem and second-order cone programming(SOCP).The heterogeneity of normally consolidated(NC)clays is simulated by adopting a well-known general model of undrained shear strength increasing linearly with depth.In contrast,for overconsolidated(OC)clays,the variation of undrained shear strength with depth is considered to follow a bilinear trend.Furthermore,the inherent anisotropy is accounted for by adopting different values of undrained shear strength along different directions within the soil medium,employing an iterative-based algorithm.The results of numerical simulations are utilized to investigate the influences of natural soil heterogeneity and inherent anisotropy on the ultimate bearing capacity,failure envelope,and failure mechanism of shallow foundations subjected to the various combinations of vertical-horizontal(V-H)and vertical-moment(V-M)loads. 展开更多
关键词 Shallow foundation Bearing capacity Combined loading Undrained shear strength Inherent anisotropy Heterogeneity
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A thermoelastic model with two relaxations for the vibration of a microbeam resting on elastic foundations 认领 引用 被引量：1
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作者 Z.S.HAFED A.M.ZENKOUR 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第4期711-722,共12页
The Euler-Bernoulli(E-B)beam theory is combined with Green-Lindsay's(G-L)generalized thermoelasticity theory to analyze the vibration of microbeams.The frequency control equation,based on the two-parameter Winkler... The Euler-Bernoulli(E-B)beam theory is combined with Green-Lindsay's(G-L)generalized thermoelasticity theory to analyze the vibration of microbeams.The frequency control equation,based on the two-parameter Winkler-Pasternak elastic foundation for simply-supported microbeams,is presented.This study investigates the effects of the side-to-thickness ratio and relaxation time parameters on the vibrational natural frequency of thermoelastic microbeam resonators.The frequencies derived from the present model are compared with those from Lord and Shulman's(L-S)theory.The fourthorder solutions for natural vibration frequencies are graphically displayed for comparison.Therefore,attention should be paid to the use of effective foundations to prevent microbeam damage caused by contraction and expansion problems caused by high temperatures. 展开更多
关键词 Green-Lindsay's(G-L)model thermoelastic vibration Euler-Bernoulli(E-B)theory elastic foundation
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