液化微倾场地群桩地震反应分析拟静力方法  

Pseudo-static analysis method of pile group earthquake response in liquefying mild inclined sloping ground

作　　者：唐亮[1,2] 司盼 崔杰[1,2] 凌贤长[1,3] 满孝峰 TANG Liang;SI Pan;CUI Jie;LING Xian-zhang;MAN Xiao-feng(School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;Heilongjiang Research Center for Rail Transit Engineering in Cold Regions,Harbin Institute of Technology,Harbin 150090,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]哈尔滨工业大学黑龙江省寒区轨道交通工程技术研究中心,哈尔滨150090 [3]青岛理工大学土木工程学院,山东青岛266033

出　　处：《吉林大学学报（工学版）》2022年第4期847-855,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家重点研发计划项目(2016YFE0205100);国家自然科学基金项目(51578195,51608533);黑龙江省应用技术研究与开发计划项目(GA19A501)。

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。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.

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 

分 类 号：TU473[建筑科学—结构工程]