耦合场作用下泥岩填料路基边坡稳定性分析

Stability analysis of mudstone filling roadbed slope under the action of coupled field

基于COMSOL Multiphysics有限元软件分析不同降雨条件对泥岩路基边坡稳定性的影响。研究表明:在降雨时长为48 h时,降雨强度由20 mm/d增加至210 mm/d的过程中,泥岩填料路基边坡安全稳定系数由3.10降低至2.93;在降雨强度为200 mm/d,降雨时长由8 h增加至48 h过程中,边坡安全稳定系数由3.03降至2.93,满足路用性能指标要求。通过对应力场作用下泥岩填料路基边坡处于基本稳定状态、欠稳定状态、不稳定状态时的极限水平位移量进行模拟研究,获得了耦合场作用下泥岩填料路用性能阈值,为泥岩路用预警体系建立奠定了基础。

Based on COMSOL Multiphysics finite element software,the influence of different rainfall conditions on the stability of mudstone subgrade slope is analyzed.The study shows that when the rainfall duration is 48 h and the rainfall intensity increases from 20 mm/d to 210 mm/d,the safety and stability coefficient of mudstone filling roadbed slope decreases from 3.10 to 2.93.When the rainfall intensity is 200 mm/d and the rainfall duration increases from 8 h to 48 h,the slope safety and stability coefficient decreases from 3.03 to 2.93,meeting the requirements of road performance indicators.Through the simulation study of the limit horizontal displacement of the mudstone filling roadbed slope under the action of the stress field in the basically stable state,the unstable state and the unstable state,the road performance threshold of the mudstone filling under the action of the coupling field is obtained,which lays the foundation for the establishment of the mudstone road use early warning system.