地震动力作用下有限元土石坝边坡稳定性分析
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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。
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.
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.
引文
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2邵龙潭,唐洪祥,韩国城.有限元边坡稳定分析方法及其应用[J].计算力学学报,2001,18(1):81～87
3唐焕文,秦学志.最优化方法[M].大连:大连理工大学出版社,1994
4林家浩.随机地震响应的确定性算法[J].地震工程与工程振动,1985,5(1):89～94
5吴再光.地基土石坝随机地震反应及动力稳定性的概率分析[博士学位论文][D].大连:大连工学院,1987
6刘文廷.土石坝地基随机地震反应分析[博士学位论文][D].大连:大连理工大学,1993
7D on gJun.St udyon dynamicsl op estabilit yof fill-typedam models[Ph.D.thesis][D].Tokyo:CivilEngineeri ngUniversityofTokyo,1990
8邵龙潭,唐洪祥,孔宪京等.随机地震作用下土石坝边坡的稳定性分析[J].水利学报,1999,(11):66～71
9宋修广,谢能刚.高拱坝的地震能量响应分析[J].岩石力学与工程学报,2002,21(增1):2009～2011
10夏元友,李梅.边坡稳定性评价方法研究及发展趋势[J].岩石力学与工程学报,2002,21(7):1087～1091
11韩国城,孔宪京,李俊杰.面板堆石坝动力破坏性态及抗震措施试验研究[J].水利学报,1990,(12):61～67
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