高速公路隧道进洞口边坡稳定性分析

Stability Analysis of the Slope at the Expressway Tunnel Entrance

隧道进洞口处的边坡稳定性直接关系行驶在高速公路上的车辆和行人安全。如果边坡不稳定,存在滑坡、坍塌等风险,可能导致洞口区域的交通道路受阻,甚至发生事故。文章以老鹰岩隧道为背景依托,通过数值模拟对高速公路隧道进洞口边坡稳定性展开分析。结果表明,沿着坡脚到坡顶的方向,边坡各点位的水平位移和竖向位移逐渐增加,且随着埋深的增加,坡面各点位的水平位移逐渐减小,而坡面各点位的竖向位移逐渐增大。随着埋深的增加边坡的安全系数逐渐增加,相比开挖后未支护,开挖后支护增加更明显。

The stability of the slope at the tunnel entrance is directly related to the safety of vehicles and pedestrians on the expressway.If the slope is unstable and there are risks such as landslides and collapses,which may cause traffic obstruction and even accidents in the entrance area.Based on the background of the Eagle Rock Tunnel,this paper analyzes the stability of the slope at the expressway tunnel entrance through numerical simulation.The results show that the horizontal displacement and vertical displacement of each point on the slope gradually increase along the direction from the foot of the slope to the top of the slope,and with the increase of buried depth,the horizontal displacement of each point on the slope gradually decreases,while the vertical displacement of each point on the slope gradually increases.With the increase of buried depth,the safety factor of the slope gradually increases.Compared with no support after excavation,the increase is more obvious with support after excavation.