基于不同地基条件下Hardfill坝的破坏模式及稳定性研究 (研究生论坛）

Hardfill坝是一种介于重力坝与土石坝之间的新坝型，坝体结构特性较好，整体应力水平较低，应力集中不明显，但是Hardfill坝对于地基的适应能力如何还有待了解，所以对其在不同地基条件上的结构破坏模式与稳定性的研究很有必要。本文采用地质力学破坏模型试验和有限元计算，针对在外荷载作用下Hardfill坝在均质地基以及含有复杂结构面的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。

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

Hardfill dam is a new type of dam whose structural feature is between that of gravity dam and earth-rock dam. It has a relatively low overall stress level and unclear stress concentration, but the adaptability of Hardfill to foundation is still to be discovered, so it is very necessary to carry on researches on the structural failure mode and stability of Hardfill to different foundations. The paper adopts geologic mechanics failure model test and FEM calculation, and has made researches and analysis on 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 shows, the Hardfill dam heel first cracks on homogeneous foundation and the crack goes upwards to the dam toe till overall instability occurs, with an obvious overload safety coefficient; on foundation with complex structural plane, plastic failure first appears mainly at weak structural surface, which leads to an overall sliding failure, and the stability safety is relatively weaker than that on homogeneous foundation. Keywords: Hardfill Dam; homogeneous foundation; complex foundation; failure mode; geologic mechanics model test; FEM (Finite Element Method) calculation