基于不同地基条件下Hardfill坝的破坏模式及稳定性研究

Research on Failure Mode and Stability on Hardfill Dam Based on Different Foundations

采用地质力学破坏模型试验和有限元计算,针对外荷载作用下Hardfill坝在均质地基及含有复杂结构面地基上的破坏模式及其稳定性开展研究。结果显示:在均质地基上Hardfill坝由坝踵首先开裂,并沿着建基面一直贯通直至坝趾处发生整体失稳,超载安全系数较大;在含有软弱结构面的复杂地基上的坝与地基主要在软弱结构面出现塑性破坏,最终沿软弱结构面发生滑动失稳,稳定安全度相对于均质地基较弱。

Geologic mechanics failure model test and FEM calculation were adopted to study the failure mode and stability of Hardfill Dam on homogeneous foundation and foundation with complex structural plane under the action of external load.The result showed that the Hardfill dam heel first cracked on homogeneous foundation and the crack was going upwards to the dam toe till overall instability occurs,with an obvious overload safety coefficient.On the foundation with complex structural plane,plastic failure first appeared mainly at weak structural surface,leading to an overall sliding failure,and the stability safety was relatively weaker than that on homogeneous foundation.