液化微倾场地群桩-土动力相互作用p-y曲线特性  

p-y curve characteristics of pile group soil dynamic interaction in mildly inclined liquefiable ground

作　　者：崔杰[1] 张征 唐亮[1,2] 凌贤长 满孝峰[1,2] 司盼 CUI Jie;ZHANG Zheng;TANG Liang;LING Xianzhang;MAN Xiaofeng;SI Pan(School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;Heilongjiang Research Center for Rail Transit Engineering in Cold Regions, 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,黑龙江哈尔滨150090 [2]黑龙江省寒区轨道交通工程技术研究中心,黑龙江哈尔滨150090 [3]青岛理工大学土木工程学院,山东青岛266033

出　　处：《地震工程与工程振动》2021年第5期154-164,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点研发计划(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(GA19A501)。

摘　　要：基于OpenSees计算软件建立液化微倾场地群桩-土动力相互作用有限元模型,分析液化微倾场地饱和砂土p-y曲线特性,系统研究了场地倾斜角度、桩径、地震作用幅值和基桩位置对饱和砂土动力p-y曲线特性影响。研究表明:土体即将液化时,桩基土反力达到峰值;土体液化后,土体表现出了流体特性;土反力峰值、桩土相对位移峰值和初始刚度随场地倾斜角度增加而增大;桩径越大,液化砂土的耗能效应越明显;随着地震作用幅值的增加,桩土相对位移峰值和土反力峰值也随之增加;液化微倾场地上坡桩受到的土体侧向流动力大于下坡桩。Based on the OPENSEES software,a finite element model of pile group soil dynamic interaction is established,and the p-y curve characteristics of saturated sand in the liquefiable ground are analyzed.The effects of site inclination angle,pile diameter,seismic amplitude and pile position on the dynamic p-y curve characteristics of saturated sand are systematically studied.The results show that:when the soil is about to liquefy,the pile-soil reaction reaches the peak value;after the soil liquefaction,the soil shows fluid characteristics;the peak value of soil reaction,the peak value of pile-soil relative displacement and the initial stiffness increase with the increase of site inclination angle;the larger the pile diameter,the more obvious the energy consumption of liquefied sand;with the increase of seismic amplitude,the peak value of pile-soil relative displacement and the peak value of soil reaction increase.The lateral flow force of soil on the upper slope pile is greater than that on the lower slope pile.With the increase of seismic amplitude,the peak value of pile-soil relative displacement and the peak value of soil reaction force also increase;the lateral flow force of soil on the slope pile is greater than that on the slope pile.

关 键 词：液化微倾场地 动力p-y曲线 群桩-土动力相互作用 数值模拟 

分 类 号：TU473.1[建筑科学—结构工程]