挡土墙地震土压力的拟动力分析  

Pseudo-dynamic analysis on seismic earth pressure of retaining wall

作　　者：王浩[1,2] 董建华[1,2] 王永胜[1,2] 张媛[1,2] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《振动与冲击》2016年第18期128-133,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51268037;51108221);甘肃省杰出青年基金项目(145RJDA330);陇原青年创新人才扶持计划(LYRC2014002);兰州理工大学红柳杰青基金项目(J201403);国家留学基金资助项目(2011862535)

摘　　要：基于均匀土层剪切梁理论建立了边坡水平地震动力运动方程,得到了边坡坡后土体的水平位移和加速度响应。将水平加速度应用到挡土墙地震土压力拟动力分析中,对坡体刚性假定和加速度沿坡高恒定的不足进行了改进,推导出主动、被动土压力的计算公式。结合实际工程分析了墙后填土面倾角、填土内摩擦角、挡墙与填土界面摩擦角对于总土压力大小的影响,并与传统的拟静力法和拟动力法进行了比较,结果表明:地震土压力随着时间呈一种类似正弦或者余弦状波动;随着墙后填土面倾角增大挡土墙地震总主、被土压力的也呈逐渐上升趋势;随填土内摩擦角、以及挡土墙与填土界面摩擦角的增大挡土墙地震总主动土压力逐渐减小,而被动土压力则随之增大;传统的计算方法由于计算值偏小而不安全。Based on the shear beam theory of homogeneous soil layer,the motion equation of the soil slope was established under the horizontal earthquake,and the horizontal displacement and acceleration response of the slope were solved. The defects of the assumptions of rigid slope and constant acceleration along the slope hight were improved by using the pseudo-dynamic method in the analysis and the horizontal acceleration solved in the calculation of seismic earth pressure. Then the formulas for calculating the active and passive earth pressure were derived. Considering the situations in practical engineering,the influences of the angle of filling soil behind retaining wall,the internal friction angle,and the interfacce friction angle between retaining wall and filling soil on the total earth pressure were analyzed and the improved method was compared with the traditional ones. The results show that the seismic earth pressure is like a sine or cosine wave in time domain. The seismic active and passive earth pressures increase with the increase of the angle of filling soil behind retaining wall. The total seismic active earth pressure decreases with the increase of internal friction angle and filling interface friction angle gradually,while the total passive earth pressure increases. The traditional methods are not safe due to that their results are usually inclined to the small side.

关 键 词：剪切梁理论 拟动力分析 挡土墙 地震土压力 地震系数 

分 类 号：TU476[建筑科学—结构工程]