软基黏土心墙堆石坝三维有限元沉降变形计算

Three Dimensional Finite Element Settlement Deformation Calculation of Soft Foundation Clay Core Rockfill Dam

团结水库大坝是位于软基的黏土心墙堆石坝,所面临变形控制难等设计难点,结合黏土心墙堆石坝坝体结构、坝壳料设计,借鉴已建工程经验提出软基抗变形工程措施。采用三维有限元软件建立了坝体、坝基的有限元计算模型,坝壳料的静力学本构采用了邓肯张非线性弹性E-B模型,计算分析了坝体竣工期与正常蓄水位时的变形量。结果表明:坝体在竣工期、正常运行期变形规律合理,黏土心墙不会发生水力劈裂。

Dam of Tuanjie teservoir is a clay core rockfill dam located on soft foundation,which faces design difficulties such as difficult deformation control.In this paper,based on the structure and shell material design of the rockfill dam with clay core wall,the anti-deformation engineering measures for soft foundation are put forward by referring to the experience of existing projects.Finite element calculation models of dam body and foundation are established by using three-dimensional finite element software.Duncan-Zhang nonlinear elastic E-B model is used to calculate and analyze the deformation of dam body during completion period and normal water level.The results show that the deformation regularity of dam body during completion period and normal operation period is reasonable and hydraulic splitting of clay core wall will not occur.