顺层岩体路堑边坡稳定性的弹塑性有限元模拟分析

基于理想弹塑性本构模型和Drucker-Prager准则，运用岩体力学理论、有限元数值模拟技术和强度折减原理，对顺层岩体路堑边坡在开挖过程中不同阶段的应力、变形、结构面上的摩擦力和边坡的稳定性等问题进行了模拟分析。分析表明，顺层岩体路堑边坡的应力场、位移场、结构面的接触状况以及边坡的稳定性明显受开挖效应的影响；在每一阶段的开挖面上，坡脚附近的水平位移量最大，最危险接触面也都集中在开挖形成的坡脚处，此处岩石最先脱落破坏；边坡的稳定性安全系数也随着开挖阶段的深入而逐渐降低。

Simulation analysis of elastoplastic FEM for stability of bedding rock cutting slope

Based on perfectly elastoplastic constitutive model and Drucker-Prager yield criterion, the rock mechanics theory, the numerical simulation technique of FEM and the strength reduction principle are used to simulate and analyze the stress, displacement, friction on contact surface and the stability of bedding rock cutting slope in different excavated stages. The analysis indicates that the stress field, displacement field, contact status and stability of the bedding rock cutting slope are obviously influenced by excavating effect. On each excavated face, the horizontal displacement near the slope toe is the biggest; the most dangerous contact surface focuses on the excavated slope toe where the abscission destruction firstly occurs. Also, the safety factor of the slope gets lower gradually as the slope is excavated deeper.