挡土墙后黏性土的地震主动土压力分析

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摘要在Mononobe-Okabe平面滑裂面假设的基础上，考虑地震加速度的放大效应，运用拟动力学的分析方法，得到考虑时间和相位变化的刚性挡土墙后黏性土地震主动土压力系数、地震主动土压力合力和主动土压力分布强度的理论公式。在此基础上，利用优化算法得到地震卓越周期中的最不利工况，分析水平和竖向地震加速度系数、内摩擦角、墙面摩擦角、挡土墙倾角和地震放大系数对最不利工况下滑动面倾角、主动土压力系数、临界深度、合力作用点和土压力分布的影响。研究表明：地震主动土压力分布为非线性；地震加速度的存在大大增加黏性土的主动土压力；挡土墙倾角和地震放大效应对临界深度、合力作用点和土压力分布都有着明显影响。

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	夏唐代1
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	孔祥冰1
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	王志凯1
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	陈炜昀1
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关键词 ：土力学, 刚性挡土墙, 地震主动土压力, 黏性土, 拟动力学方法, 放大效应

Abstract：Based on the planar rupture surfaces hypothesis of Mononobe-Okabe theory，considering the effect of amplification of seismic accelerations and using the pseudo-dynamics method，the seismic active earth pressure coefficient，the resultant force of seismic active earth pressure and the distribution of active earth pressure on a rigid retaining wall supporting cohesive backfill are obtained respectively. Time and phase changes within the backfill are also considered. On this basis，the most unfavorable conditions are investigated by an optimization algorithm. Then the effects of horizontal and vertical seismic accelerations，internal fiction angle，wall friction angle，retaining wall angle and amplification on the inclination of the slip surface on active earth pressure coefficient，critical depth，the location of resultant force and the distribution of active earth pressure are discussed. The results show that the distribution of seismic active earth pressure is nonlinear. The existence of seismic acceleration induces a considerable increase in the active earth pressure of cohesive soil. The retaining wall angle and amplification effect of seismic accelerations have obvious influences on the critical depth，location of resultant force and distribution of passive earth pressure.

Key words： soil mechanics rigid retaining wall seismic active earth pressure cohesive soil pseudo-dynamics method amplification effect

引用本文:

夏唐代1，2，孔祥冰1，2，王志凯1，2，陈炜昀1，2. 挡土墙后黏性土的地震主动土压力分析[J]. 岩石力学与工程学报, 2012, 31(S1): 3188-3195.
XIA Tangdai1，2，KONG Xiangbing1，2，WANG Zhikai1，2，CHEN Weiyun1，2. ANALYSIS OF SEISMIC ACTIVE EARTH PRESSURE OF COHESIVE SOIL BEHIND RETAINING WALL. , 2012, 31(S1): 3188-3195.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2012/V31/IS1/3188

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