基于改进拟动力法的主动土压力分析研究  

Active earth pressure of retaining wall based on modified pseudo-dynamic method

作　　者：张磊[1] 孙树林[1,2] 储浩 丁伟[1] ZHANG Lei;SUN Shulin;CHU Hao;DING Wei(College of Earth Sciences and Engineering,Hohai University,Nanjing 210098 China;State Key Of Hydrology-Water resources And Hydraulic Engineering,Hohai University,Nanjing 210098 China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《河北工程大学学报（自然科学版）》2017年第3期32-37,共6页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家重点实验室开放研究基金资助项目(2005408911);留学回国人员科研启动基金资助项目(20071108)

摘　　要：地震条件下土压力的获取在目前的研究中通常采用拟动力方法,此方法往往忽略了后填土介质的粘弹特性及自由表面零应力这个边界条件。为了弥补现有拟动力方法的不足,考虑地震波传播介质的粘弹特性,改进原有的拟动力法;进而推求含有超载角的倾斜挡墙的主动土压力及其临界破坏时的破裂角计算公式,分析了超载角、地震力系数等参数对临界破裂角及主动土压力系数的影响。结果表明:临界破裂角随竖直地震力系数的增大而增大;水平地震力系数、超载角、内摩擦角以及挡土墙倾角对挡土墙设计影响大。The pseudo dynamic method is one of the most common methods to obtain the earth pressureunder seismic conditions.However,this method often ignores the viscoelastic characteristics of thebackfi ll medium and boundary condition with the zero stress on the free surface.In order to remedy thedeficiency of the existing pseudo dynamic method,in this paper,the viscoelastic properties of seismicwave propagating medium are considered to improve original pseudo-dynamic methods;Then thecalculation formula of the active earth pressure of the inclined retaining wall with overload angle and thefracture angle under the critical failure are derived,and the infl uences of overloading angle,seismic forcecoeffi cient and other parameters on the critical rupture angle and the coeffi cient of active earth pressureare analyzed.The results show that the critical rupture angle increases with the increase of vertical seismicforce coeffi cient;the horizontal earthquake force coeffi cient,overloading angle,internal friction angle andretaining wall inclination have great infl uence on the design of retaining wall.

关 键 词：地震 挡土墙 主动土压力 临界破裂角 改进拟动力法 

分 类 号：TU4[建筑科学—土工工程]