某铁路路堑边坡支护效果数值模拟研究

本文利用有限元强度折减法与ABAQUS中的Mohr-Coulomb准则相结合分析边坡稳定问题,对内蒙古某一铁路工程K22+600、DK22+640.00、DK+368.810、DK19+789.78处边坡的稳定性进行了分析,研究了在降雨强度为22 mm/h、降雨时间为72 h下边坡的安全性。结果表明,边坡在未支护条件下的的稳定系数分别为1.85、1.96、1.87、2.45,边坡在挡土墙支护下各边坡的安全系数分别为1.96、2.25、1.94、2.55,在挡土墙和骨架共同支护下边坡的稳定性系数分别为1.96、2.20、1.90、2.50,设置挡土墙可以提高边坡的安全系数,拱形骨架一定程度上削弱了挡土墙支护下边坡的稳定性。同时,在降雨时间为1h时各边坡达到了最大位移(分别为1.30、1.18、1.00、0.95 mm),1~72 h中各边坡的位移在最大位移处小幅波动、即边坡处于安全状态。本文成果对于边坡稳定性评价和边坡开挖施工具有一定的指导意义。

Simulation of Stability of a Railway Cutting Slope With Supporting Structure

Using the software ABAQUS, the finite element strength reduction method was combined with Mohr- Coulomb criterion to analyze the stability of a cutting slope with supporting structure. The segments K22 ＋ 600, DK22 ＋ 640.00, DK ＋ 368. 810, and DKI9 ＋ 789. 78 were utilized as examples to in- vestigate the stabilities of the slopes and their changes with the raining intensity of 22mm/h and the raining duration of 72h. It shows that the factors of safety of the cutting slopes without sup- porting structures were 1.85, 1.96, 1.87, and 2. 45, respec- tively; the factors of safety of the slopes using supporting struc- tures were 1.96, 2. 20, 1.90, and 2. 50, respectively; the retaining wall may increase the stability of the slopes; the arc skeleton may weaken the stability with supporting structures ; the slopes have the maximum displacements of 1.30, 1.18, 1.00, and 0. 95 mm when it was 1 h after raining, whereas the dis- placements fluctuated slightly around the maximum ones （or,the slopes was in a safe state） when it was 1 to 72 h after rai- ning. The methods presented herein may be referable both in e- valuating the stability of cutting slopes and in construction in practice.