基于渗流与应力耦合的防渗墙与坝体相互作用的数值模拟

封闭式坝体防渗墙在土石坝除险加固工程中得到广泛应用.然而，目前针对土石坝加固工程中增建的封闭式坝体防渗墙的研究相对较少，特别是关于墙-坝体相互作用的研究中很少考虑渗流与应力的耦合作用.为探讨土石坝加固工程中墙-坝体相互作用的数值模拟方法及作用机理，在分析实际工程条件的基础上，利用ABAQUS有限元软件建立渗流与应力耦合数值模型，实现了同时考虑墙-土接触、渗流-应力耦合共同作用的模拟.分析结果表明，所采用的耦合数值模型能较好模拟防渗墙与坝体的相互作用；土石坝加固工程中的封闭式坝体防渗墙墙体的应力主要由水平荷载引起，简单忽略渗流与应力的耦合作用会导致墙体应力的计算结果偏于不安全.

Numerical simulation of interaction between cut-off wall and earth-rock dam based on coupling of seepage and stress

The closed cut-off wall is widely used in the reinforcement projects of earth-rock dams. However， there are few studies of the closed cut-off wall. Further more， there are few studies of the interaction between the cut-off wall and the earth-rock dam， which consider the coupling effect of seepage and stress. In order to discuss the numerical simulation method and the principle of the wall-dam interaction in the reinforcement project， on the basis of analyzing the actual engineering conditions， a seepage and stress coupled numerical model is established by using ABAQUS. The contact of wall-dam together with the coupling of seepage-stress are taken into account in the model. The research results show that the model is feasible to simulate the interaction between the cut-off wall and the earth-rock dam， that the stress of the closed cut-off wall which is built in the earth-rock dam is mainly caused by horizontal load， and that simply ignoring the coupling effect may lead to unsafe calculation.