强度折减系数法在学堂湾滑坡稳定性评价中的应用

基于强度折减系数的有限单元法不但满足力的平衡条件,而且考虑了材料的应力应变关系,使得计算结果更加精确合理.本文采用非线性有限元强度折减法对三峡库区三期地质灾害防治工程应急抢险紧急实施项目--学堂湾滑坡进行稳定性评价研究.研究结果表明,与传统刚体极限平衡法相比,该方法能够更有效地描述边坡破坏模式,而且通过研究边坡稳定分析所计算的安全系数以及通过最大剪切变形率的相关等值线可以查看破坏形态,更有助于理解滑体破坏机制.有限元强度折减系数法为滑坡稳定性评价提供了一条更为有效的途径.

Application of strength-reducing factor method to stability analysis of Xuetangwan Land-slide

The present paper is aimed at introducing the authors' application of the strength-reducing factor method to the Xuetangwan Land-slide in the Three Gorges Reservoir Area (Yangtze). As is known, FEM (Factor Evaluation Method) has been developed based on the method which can help to secure the force equilibrium balance while considering the relationship between the stress and the strain of materials. It helps to make the computation results much more precise and justifiable. The authors had been trying to use the nonlinear nature of the method for analyzing the stability on the above said area. Our application results show that it comes into perfect conformity to the traditional grid limit equilibrium method and can reflect the destruction pattern of the land-slide efficiently. The destruction mode can also be demonstrated by safety factor and the maximum shear strain, so that it can contribute to our comprehensive understanding of the land-sliding destruction mechanism. Therefore, to some extent, strength reduction FEM offers a new approach to better evaluation of the land-sliding stability.