液化微倾场地群桩地震反应分析拟静力方法

doi:10.13229/j.cnki.jdxbgxb20200899

摘要/Abstract

摘要：

采用水?土动力耦合四节点等参单元，结合可准确描述砂土液化特性和累积剪切变形特性的多屈服面弹塑性本构模型，建立了液化微倾场地群桩?土动力相互作用有限元模型。随后，利用此模型计算获得正弦荷载作用下桩?土动力p?y曲线，以场地倾斜角度和埋深作为主控因素，对API规范计算公式中极限土阻力参数进行修正，提出修正系数。最后，基于非线性文克尔地基梁模型，提出液化微倾场地群桩?土相互作用拟静力方法，并通过有限元分析结果验证，拟静力方法的正确性和可靠性，据此研究桩模量、桩底连接刚度和桩径对桩基地震响应的影响规律。研究表明：随着桩基模量和桩底连接刚度的增加，桩侧向位移减小；保持桩基抗弯刚度不变，桩的弯矩和位移随着桩径增大而显著增加。

关键词: 岩土工程, 液化微倾场地, 动力p?y曲线, 拟静力方法, 参数分析

Abstract:

First， using quadUP element with water-soil dynamic coupling and a multi-yield plastic constitutive model that can accurately describe the liquefaction characteristics of sand and the accumulation of shear deformation， a two-dimensional finite element numerical model of pile-soil dynamic interaction in liquefying mild inclined sloping ground is established. Then， this model is used to obtain the dynamic p-y curve under sinusoidal load. The slope angles and the depth are selected as the control indexes to establish the formula of dynamic p-y curve of saturated sand. Third， combined with the nonlinear Winkler foundation beam model， the pseudo-static analysis model of pile-soil interaction in liquefiable mild inclined ground was established. Based on the finite element analysis results， the validation of the pseudo-static analysis method was achieved before presentation of a detailed parametric study on the pile dynamic response. The results show that the displacement of pile decreases with the increase of the modulus of pile foundation and the rigidity of pile bottom connection. When the bending stiffness of pile foundation is constant， the bending moment and displacement of pile increase significantly with the increase of pile diameter.

Key words: geotechnical engineering, liquefying inclined ground, dynamic p-y curve, pseudo-static analysis, parameter analysis

中图分类号:

TU473

唐亮,司盼,崔杰,凌贤长,满孝峰. 液化微倾场地群桩地震反应分析拟静力方法[J]. 吉林大学学报(工学版), 2022, 52(4): 847-855.

Liang TANG,Pan SI,Jie CUI,Xian-zhang LING,Xiao-feng MAN. Pseudo-static analysis method of pile group earthquake response in liquefying mild inclined sloping ground[J]. Journal of Jilin University(Engineering and Technology Edition), 2022, 52(4): 847-855.

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参数	松砂	参数	松砂
密度ρ/（kg·m^-3）	1900	剪缩系数c₁	0.2
参考剪切模量G_r /kPa	64000	剪胀系数d₁	0.4
参考体积模量B_r /kPa	200000	剪胀系数d₂	0.2
摩擦角?/（o）	32	液化系数l₁	10
峰值剪应变γ_max	0.1	液化系数l₂	0.2
参考围压P_r /kPa	100	液化系数l₃	1.0
围压系数n_p	0.5	屈服面数量n	11
相位转换角?_PT /（o）	27

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