考虑土体强度非线性的地震主动土压力分析  

Seismic Active Earth Pressure Analysis Considering Nonlinear Soil Strength

作　　者：彭晓钢 王寰宇 李有志 PENG Xiaogang;WANG Huanyu;LI Youzhi(Shenzhen Tagen Group Co.,Ltd.,Shenzhen,Guangdong 518034,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China)

机构地区：[1]深圳市天健(集团)股份有限公司,广东深圳518034 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《建筑施工》2021年第6期1135-1140,共6页Building Construction

摘　　要：大量试验研究和工程实践表明岩土体强度通常是非线性的。在极限分析上限理论的基础上,采用广义切线技术和拟动力法,对挡土墙的地震主动土压力上限进行分析。同时,采用离散法生成破坏机构来满足惯性力随空间位置变化的要求。对比和研究表明,水平地震系数、周期、波速、土体放大系数、垂直地震系数的增大均导致主动土压力的增大。此外,初始黏聚力的增大有利于墙后填土的稳定,而非线性系数和单轴抗拉强度的增大均不利于墙后填土的稳定。研究结果可为工程设计与施工提供参考。A large number of experimental studies and engineering practice show that the strength of rock-soil is usually nonlinear.Based on the upper bound theory of limit analysis,the upper bound of seismic active earth pressure of retaining wall is analyzed using generalized tangent technique and pseudo-dynamic method.At the same time,the discrete method is used to generate the failure mechanism to meet the requirements of the inertial force changing with the spatial position.The comparison and research show that the increase of horizontal seismic coefficient,period,wave velocity,soil amplification coefficient and vertical seismic coefficient all lead to the increase of active earth pressure.In addition,the increase of initial cohesion is conducive to the stability of the filling behind the wall,while the increase of nonlinear coefficient and uniaxial tensile strength are not conducive to the stability of the filling behind the wall.The research results can provide reference for engineering design and construction.

关 键 词：主动土压力 挡土墙 极限分析 拟动力法 

分 类 号：TU753[建筑科学—建筑技术科学]