考虑墙背倾角的挡土墙地震主动土压力研究  

Research on earthquake active earth pressure of inclined retaining wall

作　　者：周勇[1,2,3] 都浩男 王正振[1,2,3] ZHOU Yong;DU Hao-nan;WANG Zheng-zhen(Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Western Center of Disaster Mitigation in Civil Engineering,Ministry of Education,Lanzhou Univ.of Tech.,Lanzhou 730050,China;School of Civil Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

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,甘肃兰州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,甘肃兰州730050 [3]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2023年第2期110-116,共7页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51568042)。

摘　　要：根据前人提出的土体内外摩擦角随土体位移逐渐发挥的理论,综合考虑绕墙趾转动的位移模式与地震力对土压力的影响,利用水平层分析法推导了挡土墙地震主动土压力沿墙高分布、合力及合力作用点高度的理论公式,分析了墙体位移量与地震加速度系数对土压力分布、最危险滑裂面倾角、合力作用点高度及主动侧土压力系数的影响.分析结果表明,土压力强度呈非线性分布,所得主动土压力合力经简化之后与Mononobe-Okabe理论相同,滑裂面倾角随地震系数增加而减小,合力随地震系数增大而减小,主动侧土压力系数随墙背倾角和地震系数的增大而增大.经有限元软件模拟验证,本文计算所得结果与模拟所得土压力分布曲线变化趋势基本吻合.According to the theory that the internal and external friction angles of the soil are gradually exerted with the displacement of the soil,the displacement mode around the bottom of the wall,and the influence of the seismic force on the earth pressure are comprehensively considered.The horizontal layer analysis method is used to derive the theoretical formula of wall seismic active earth pressure along the wall height distribution,resultant force and joint force height.The effects of the displacement of the wall and the seismic acceleration coefficient on the earth pressure distribution,the most dangerous slip surface inclination angle,the combined force point height and the active side soil are analyzed.The analysis results show that the soil pressure intensity is nonlinearly distributed.After simplifying,the obtained combined force of active earth pressure is the same as the result of the Mononobe-Okabe theory.The slip angle of the slip surface decreases with the increase of the seismic coefficient,as does the combined force of active earth pressure,while the active lateral earth pressure coefficient increases with the wall back inclination angle and seismic coefficient.The finite element simulation proves that the variation trend of the soil pressure distribution curve obtained by the simulation is basically consistent with the calculated results.

关 键 词：挡土墙 地震 水平层分析法 主动土压力 

分 类 号：TU476[建筑科学—结构工程]