Ultimate lateral bearing capacity of rigid pile in clay considering soil stress history and scour-hole dimension

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Mingke Lin , Changbing Qin , Siyu Li , Jiangtao Yi
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Abstract

Rigid monopiles in a marine environment are frequently subjected to severe lateral loads and scour effects, which complicates the stability assessment of monopiles. This paper proposes a ‘double failure mechanism’ that integrates the meniscus-conical failure wedge and rotational failure model to evaluate the ultimate lateral bearing capacity of a rigid pile in clay under scour conditions. Considering the influence of scour-hole, three distinct failure modes are introduced based on the possible ranges of failure. The critical ‘double failure mechanism’ can satisfy both the force balance and the moment balance of the pile-soil system. Based on this framework, an analytical solution for the ultimate lateral bearing capacity of a rigid monopile with considerations of these three failure modes is derived using the limit equilibrium method. Additionally, the combined effects of additional stress and stress history on soil properties are accurately analyzed. The FEM results and existing theoretical solutions are employed to validate the derived limit equilibrium solution. Finally, the effects of scour-hole dimensions and load eccentricity on the ultimate lateral bearing capacity of a rigid monopile, wedge failure and rotational failure are investigated.
考虑土壤应力历史和冲孔尺寸的粘土中刚性桩的极限侧向承载力
海洋环境中的刚性单桩经常受到严重的侧向荷载和冲刷影响,这使得单桩的稳定性评估变得复杂。本文提出了一种 "双重破坏机制",综合了半月板-锥形破坏楔和旋转破坏模型,用于评估冲刷条件下粘土中刚性桩的极限侧向承载力。考虑到冲刷孔的影响,根据可能的破坏范围引入了三种不同的破坏模式。临界 "双重破坏机制 "可同时满足桩-土系统的力平衡和力矩平衡。在此框架基础上,使用极限平衡法得出了考虑这三种破坏模式的刚性单桩最终侧向承载力的分析解决方案。此外,还精确分析了附加应力和应力历史对土壤性质的综合影响。利用有限元结果和现有的理论解决方案来验证推导出的极限平衡解决方案。最后,研究了冲孔尺寸和荷载偏心对刚性单桩极限侧向承载力、楔形破坏和旋转破坏的影响。
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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