摘要
本文在“嘉峪关市地震危险性分析”工作的基础上，以大草滩水库土石坝为例，研究了坝体震害预测的方法。用动力非线性有限元法计算并分析了坝体的非线性动力特性，给出了５０年超越概率为１０％和２％两种风险水平下，坝体表面可能出现的拉裂区域和坝体内可能出现的塑性破坏区域，并给出了有代表性的一些地点的加速度时程和动剪应力时程。本文还用拟静力法对坝体的整体稳定性进行了分析计算，给出上述两种风险水平下，在可能遇到的各种情况下，坝体的整体安全可靠性能。
Based on“The Seismic Risk Analysis of Jiayuguan City”,this paper anticipates the seismic disas-ter of Dacaotan earth dam. We calculate and analyse the dam’s nonlinear dynamic characteristics usingdynamic nonlinear finite element method,and give the possible pull-open regions on the dam' s surfaceand the possible plastic failure regions in the dam under l0%and 2%of exceedance probability duringaperiod of 50 years,andgive the acceleration time history and shear stress time history of several rep-resentative points. We also calculate and analyse the whole stability of the dam. Under the two ex-ceedance probabilities,this paper gives the whole safe reliability during a period of 50 years.
出处
《西北地震学报》
CSCD
1994年第1期70-77,共8页
Northwestern Seismological Journal
关键词
地震
震害
预测
坝体
土石坝
Earth dam
Seismic disaster prediction
Dynamic nonlinear finite element method
