基于邓肯-张模型的黏土心墙堆石坝有限元数值模拟分析

Finite Element Numerical Simulation of Rock-fill Dam with a Clay Core Based on the Duncan-Chang Model

基于邓肯-张非线性弹性材料模型,对云南省某在建黏土心墙堆石坝逐层填筑施工和正常蓄水+9度地震作用两种工况情况下的坝体应力和变形进行了有限元数值模拟与分析。结果表明:由于存在"内部拱效应",过渡层出现应力集中,心墙出现应力迅速降低;填筑竣工后的大坝应力分布和位移符合一般规律,但9度地震作用下可能会引起大坝失稳,建议采取一定的工程措施,提高坝坡的抗震稳定性。

Based on Duncan-Chang nonlinear elastic material model,this paper carries out a numerical analysis of rock-fill dam with a clay core, under the construction in Yunnan Province, by using finite element method to obtain the stress and deformation of the dam in two conditions, filling construction of the dam step by step and the normal water storage plus 9-degree seismism. The results show that： because of the ＂arch effect＂ , stress concentration occurs in transition layers, but stress drops sharply in the clay core; the distribution of stress and displacement accords with the general rules, but the action of 9-degree seismism may cause the instability of the dam. For the purpose of improving the seismic stability of the dam, some engineering measures should be taken.