张峰斜心墙堆石坝应力应变静动力有限元分析

Stress and Deformation Analysis of Zhangfeng Sloping Core Rock-fill Dam with Static-dynamic FEM

针对张峰水库地质条件复杂、覆盖层含有软弱夹层的问题,采用三维静动力有限元法,基于邓肯—张非线性弹性模型和修正的哈定—德涅维奇模型,模拟了张峰水库粘土斜心墙堆石坝在竣工期、运行期的应力应变情况,得出了应力应变的分布规律。结果表明,各工况下的坝坡安全系数均大于规范允许值,坝基软弱夹层不影响大坝的稳定安全性;竣工期坝体最大沉降位移为33 cm(约为最大坝高的0.46%),运行期最大水平向位移为31.6 cm;竣工期和运行期坝体内部应力水平均小于1。

According to the actual geological and topographical conditions of Zhangfeng reservoir pivot project,3-D static and dynamic finite element method is adopted to obtain the stress and strain distribution laws of clay sloping core rock-fill dam at the time of completion period and operation period by using Duncan-Chang nonlinear elastic model and modified Hardin-Drnevich model.The results show that the safety factors of dam slope is large than allowable value of specification at all operating conditions;dam foundation with soft interlayer has not impact on the dam stability;the maximum dam settlement in completion period is 33 cm or 0.46% of the dam height,and the maximum level displacement in operation period is 31.6 cm;the dam internal stress level values are less than 1.