土质路堤高边坡稳定性及力学参数分析

Analysis of Stability and Mechanical Parameters of High Slope for Soil Embankment

为确定某道路工程土质路堤高边坡的稳定性状态,采用Midas有限元分析软件对该填土高边坡在天然状况下的边坡内应力及位移分布进行了数值分析,并结合极限平衡方法,计算出天然工况下该路堤边坡每个土条在最危险滑动面上的安全系数与土条力学参数的变化关系。研究结果表明:该边坡很可能在中部产生坡面凸出和坡面剥落破坏,且具有沿着圆弧面产生滑移破坏的特征。靠近坡顶位置土体的安全系数最大,土条底部的法向应力、抗剪应力、剪应力、内摩擦角从坡顶到坡脚均表现为先增大后减小的变化趋势,土条底部的黏聚力则变化不大。该路堤边坡的稳定性安全系数较小,不符合规范中的安全设计要求,需采取工程加固措施。研究成果为该边坡工程提供了良好的施工指导。

in order to determine the stability of the high slope of the soil embankment in a road project,the soil slope under natural condition of slope stress and displacement distribution were numerically analyzed by finite element analysis software Midas,combined with the limit equilibrium method,the safety factor of the embankment slope of each soil strip and soil mechanics parameter were calculated. The study showed that the slope was likely to produce convex in the middle of slope surface and slope surface spalling and damage,and have the characteristics of slip failure along the arc surface. The safety coefficient of slope near the location of soil was the largest,soil bars at the bottom of the normal stress,shear force,shear force,internal friction angle of the slope presented the change trend that they increased at the top and then decreased at the foot,the cohesion of soil strip bottom had little change. The stability of the embankment slope safety coefficient was small,which can not meet the requirements of safety design specifications and the engineering reinforcement measures should be taken. The research results provided good construction guidance for the slope engineering.