地震动力作用下有限元土石坝边坡稳定性分析

第23卷 第8期

岩石力学与工程学报 23(8)：1318～1324

2004年4月 Chinese Journal of Rock Mechanics and Engineering April ，2004

2002年6月11日收到初稿，2002年8月23日收到修改稿。

作者 唐洪祥 简介：男，28岁，1998年毕业于大连理工大学土木工程系岩土工程专业，现为在职博士研究生，主要从事岩土工程方面的科研与教学工作。

地震动力作用下有限元土石坝边坡稳定性分析

唐洪祥1 邵龙潭2

(1大连理工大学海岸与近海工程国家重点实验室 大连 116023) (2大连理工大学工程力学系 大连 116023)

摘要 基于地震动力时程反应和随机地震反应，用有限元边坡稳定性分析方法，分析了正弦波作用下模型坝边坡的稳定性，以此作为该方法的数值验证；而后，通过对地震动力作用下土石坝边坡稳定性的分析，对地震动力作用下影响坝体边坡最危险滑裂面位置及稳定性的动力影响因素进行了有益的探讨，并指出，地震动力作用下土石坝边坡与正弦波作用下模型坝边坡的最危险滑动面位置有所不同。

关键词 边坡工程，有限元边坡稳定性分析，地震动力时程反应，确定性随机地震反应，土石坝 分类号 O 241.82 文献标识码 A 文章编号 1000-6915(2004)08-1318-07

FINITE ELEMENT ANALYSIS ON SLOPE STABILITY OF EARTH-ROCK

DAM UNDER EARTHQUAKE

Tang Hongxiang 1

，Shao Longtan 2

(1State Key Laboratory of Coastal and Offshore Engineering ，Dalian University of Technology ，Dalian 116023 China )

(2Department of Engineering Mechanics ，Dalian University of Technology ，Dalian 116023 China

)

Abstract The problem of slope stability under earthquake is not yet solved because of complexity and nonlinear properties of soil and rock. The earthquake ground motion is of the stochastic nature ，and the failure of earth rock dam under earthquake greatly depends on the details of ground motion. Based on definite stochastic seismic response and time-history seismic response analysis ，the slope stability of earth-rock dam is studied by finite element method combining with Hook-Jevees searching method. First ，based on time-history response analysis of a sand dam model excited by sine wave ，the time-history of the limit sliding surface and the minimum safety coefficient of slope are obtained. Then ，with input of equivalent power spectrum of the sine wave ，the dam model is analyzed with the definite stochastic seismic response method ，and the properties of slope stability and the location of sliding surface are determined. The results of the two analyses agree well with those of the dam model test. It can be concluded that the location and the stability of sliding surface are effected by the factors ，such as the maximum value of acceleration ，the predominant periods and the types of earthquake records. It should be noted that ，the location of limit sliding surface of the dam model excited by sine wave is different from that of earth-rock dam under earthquake. Key words slope engineering ，finite element analysis on slope stability ，time-history seismic response ，definite stochastic seismic response ，earth-rock dam 1 前 言

虽然地震动力作用下土石坝的动力反应计算方

法有了很大的发展，但计算地震动力作用下坝体边

坡的稳定性问题一直没有得到很好地解决。直到现在，土石坝边坡的地震动力稳定性分析方法主要还是以条分法思想为基础的拟静力法。该方法将地震