基于有限元水平地震荷载作用下土坡稳定性分析

摘要

Based on GeoStudio finite element software, the influence of horizontal earthquake load on slope stability is analyzed. Depending on quasi-static method and the stress and deformation of Mohr-Coulomb ideal elastic-plastic model under horizontal earthquake load, the stability of a soil slope is analyzed using slope/w rigid body ultimate equilibrium program combined with sigma/w finite element program, where the serrated sliding surface composed by rectangular finite element mesh boundary substituted for traditional arc sliding surface. It is shown that the calculation results are close using these two methods. Under the same conditions, safety factor calculated using finite element method is slightly more than that using rigid body ultimate equilibrium method.%基于GeoStudio有限元软件，分析水平向地震荷载对边坡稳定的影响，借助拟静力法和莫尔一库伦理想弹塑性模型在水平向地震荷载作用下的应力、变形，应用slope／w刚体极限平衡稳定分析程序与sigma／w有限元程序相结合的方法，以有限元矩形单元网格边界组成的锯齿状滑裂面替代传统的圆弧滑动面，对一土坡的稳定性进行了分析。计算结果表明，二者的计算结果相近，且在相同工况下有限元计算安全系数略大于刚体极限平衡法计算安全系数。