上覆土层对倾斜液化场地-桩基-结构地震反应的影响研究  

Effect of overlying crust on seismic response of inclined liquefiable site-pile foundation-structure system

作　　者：张小玲[1,2] 房丽净 许成顺[1,2] 贾科敏 ZHANG Xiao‑ling;FANG Li‑jing;XU Cheng‑shun;JIA Ke‑min(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《振动工程学报》2024年第12期2055-2065,共11页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(52078016)。

摘　　要：倾斜液化场地桩基的地震动力响应是岩土抗震工程领域关注的重要问题。本文依据振动台模型试验,基于OpenSees软件平台建立了倾斜液化场地-群桩-结构相互作用二维整体化数值模型,模型中考虑了桩-土接触的非线性以及土层的剪切局部化,并通过与振动台试验结果进行对比,验证了本文数值模拟方法的合理性和有效性。在此基础上,建立了针对实际场地的典型倾斜液化场地-群桩-结构相互作用有限元模型,讨论了不同上覆土层参数对场地及结构体系地震反应的影响。计算结果表明:随着上覆土层厚度的增大,饱和砂土层中的孔压比减小,土体的水平残余位移减小,同时桩身位移以及桩基曲率均有所减小;上覆土层强度对桩基动力反应的影响更加显著;上覆土层厚度的增加可以降低土层的液化程度并提高桩基的受力性能。The seismic dynamic response of pile foundation in inclined liquefaction site is an important issue in the field of geotechnical seismic engineering.Based on the shaking table model test carried out by our research group and the OpenSees software plaform,a two-dimensional integrated numerical model of inclined liquefied soil-pile group-structure interaction is established in this paper.The nonlinearity of pile-soil contact and the shear localization of soil layer are considered in the model.The rationality and effectiveness of the numerical simulation method are verified by comparing with the shaking table test results.On this basis,a typical inclined liquefied site-pile group-structure interaction finite element model is established to discuss the influence of different overlying crust on the seismic response of site and structure system.The calculation results show that with the increase of the thickness of overlying crust,the pore pressure ratio in the saturated sand decreases,the horizontal residual displacement of soil decreases,and the displacement of pile body and the pile curvature decrease.The effect of the strength of overlying crust on the dynamic response of pile foundation is more obvious.The increase of the thickness of overlying crust can reduce the liquefaction degree of sand and improve the mechanical performance of pile foundation.

关 键 词：地震响应 桩-土相互作用 上覆土层 倾斜液化场地 数值模拟 

分 类 号：TU435[建筑科学—岩土工程] TU473.1[建筑科学—土工工程]