地震条件下黏性土挡土墙土压力分析  

Analysis of earth pressure of cohesive soil behind a retaining wall under seismic condition

作　　者：陈奕柏[1] 谢洪波[1] 柯才桐[1] 高洪波[1] 

机构地区：[1]海南大学土木建筑工程学院,海口570228

出　　处：《岩土力学》2014年第12期3396-3402,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.51268010);海南省自然科学基金资助项目(No.512116)

摘　　要：Mononobe-Okabe理论是现阶段计算地震土压力的常用方法,但Mononobe-Okabe理论的诸多假设使其具有一定的局限性。针对Mononobe-Okabe理论的不足,考虑到地震作用下挡土墙偏转对土压力的影响,采用斜向条分法推导了复杂条件下黏性土地震土压力强度分布、土压力合力及其作用点位置公式,并利用图解法给出了临界破裂角的解析解。研究表明:填土黏聚力和地震系数对土压力影响显著;忽略黏性填土表面开裂与地震作用对均布超载及开裂填土等效超载的影响将使主动土压力计算结果偏小,其误差随着填土黏聚力和均布超载的增大而增大;在不同水平地震系数下土压力沿墙高呈非线性分布;所提公式适用范围更广,有效完善了Mononobe-Okabe理论。Mononobe-Okabe theory is a widely used method to calculate seismic earth pressure at present; but some hypotheses of which have certain limitations. In light of the deficiency of Mononobe-Okabe theory, and considering the effect of retaining wall deflection on earth pressure, the diagonal slice method is used to deduce the strength distribution of seismic cohesive earth pressure under complex states; earth pressure resultant and its action point. The analytical solution of critical rupture angle is given with graphical method. Research results show that fill cohesion and seismic coefficient influence earth pressure signally; ignoring the surface cracking of cohesive fill and the impact of the earthquake on the uniform overload and the crack fill equivalent overload would make the result of active earth pressure turn small, whose deviation would turn big as fill cohesion and uniform overload goes up; earth pressure is in linear distribution along the height of wall in different horizontal seismic coefficients; the given formula fits wider situations, and effectively improves the Mononobe-Okabe theory.

关 键 词：挡土墙 黏性土 地震土压力 斜向条分法 非线性分布 

分 类 号：TU432[建筑科学—岩土工程]