基于非线性抗剪强度指标的面板堆石坝坝坡稳定有限元分析

面板堆石坝坝坡稳定分析的关键是如何合理选择堆石材料的抗剪强度指标,以及如何选用能合理反映坝坡失稳破坏机理的抗滑稳定分析方法.本文结合工程实例,以面板堆石坝坝坡稳定安全系数为研究对象,通过与按线性抗剪强度指标计算结果的比较,研究论证了采用非线性抗剪强度指标的合理性.在采用非线性抗剪强度指标的前提下,通过与传统的刚体极限平衡法计算结果的比较,分析说明了有限元法计算结果的准确性与合理性.结果表明,对于面板堆石坝的坝坡稳定问题,采用基于非线性抗剪强度指标的有限元方法可以获得更为合理的结果.

Finite Element Analysis for the Slope Stability of the Concrete Face Rockfill Dam Based on Non-linear Shear Strength Indicators

The key of slope stability analysis of concrete face rockfill dam is how to reasonably choose the shear strength indicators of the rockfill materials, and how to choose the anti-slide stability analysis method reasonably reflected the failure mechanism of slope instability. Taking the face rockfill dam slope stability and safety factor as research subjects, through compared linear shear strength indicators, the paper demonstrated the reasonableness of non-linear shear strength index and explained the accuracy and reasonableness of the finite element method by comparing finite element method with the traditional rigid body limit equilibrium method. The results shown that by using the non-linear shear strength of the finite element method to resolve the problem of slope stability of the concrete face rockfill dam can obtain more reasonable results.