地震作用下可液化土层水平受荷桩基力学响应分析  

Mechanical response of horizontal loaded pile in liquefiable soil under earthquake load

作　　者：高新文[1] 

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《地震工程与工程振动》2016年第3期102-110,共9页Earthquake Engineering and Engineering Dynamics

基　　金：山西省基础研究计划项目(2014021033-1)~~

摘　　要：地震作用下可液化场地桩土相互作用研究是解决可液化场地桩基抗震问题的有效途径。本文基于p-y曲线方法,通过Cu因子法建立地震过程中可液化地层的典型p-y曲线模型。结合有限差分原理,建立了水平受荷单桩在地震作用下的水平附加响应计算方法,通过实例验证了该计算方法的合理性。最后控制变量,利用该方法进行了一系列的参数分析。研究结果表明:可液化地层厚度、桩基受荷水平和液化程度对于地震液化引起的受荷桩基水平附加响应的影响都较为显著;桩身附加挠度和附加弯矩均随着受荷载水平或液化程度的增大而呈非线性形式增大,且受荷水平或液化程度越高,增长速率越大。The pile-soil interaction under earthquake load is the key problem of seismic resistance in liquefiable soil. Based on the p-y curve method,the p-y curve is modeled by the Cufactor method after the soil liquefies. In combination with the finite difference algorithm,a calculated method is proposed to calculate the liquefaction-induced additional response of a pile bearing external horizontal load,and the reasonable of this method is justified by a case study. Finally,this proposed method is used to perform a series of parametric analysis. Results show that the liquefaction-induced additional response is significantly influenced by the depth of liquefiable soil layer,the applied load on the pile head,and the liquefaction degree. With the increase in the applied load on the pile head（ or the liquefaction degree）,the liquefaction-induced additional pile deflection and bending moment increase nonlinearly,and the higher the applied load（ or the liquefaction degree）,the greater the increasing rate.

关 键 词：地震 可液化地层 桩土互相作用 P-Y曲线 附加响应 

分 类 号：TU4[建筑科学—土工工程] P315.93[天文地球—地震学]