路堑高边坡静力荷载下支护前后数值模拟分析

Numerical Simulation Analysis of Supporting of High Cutting Slope under Static Load

为研究边坡开挖及支护后的稳定性,对开挖及支护后边坡进行FLAC3D数值模拟分析,从水平位移、应力和垂直位移、应力云图等方面对其稳定性进行分析。结果表明:(1)边坡开挖后其稳定性系数较低,不能达到规范要求,其潜在破坏模式为沿岩层分界面滑移破坏,坡脚部位为受应力最大区域。(2)进行锚杆支护后,边坡位移量明显降低,水平方向较之于垂直方向更为明显,且稳定性系数达到规范要求。(3)从应力云图中可得,锚杆锚固段明显受到剪应力作用,锚杆将不同风化程度的岩层连接在一起,使其处于相对稳定状态。

In order to study the stability of the slope after excavation and support,FLAC3D numerical simulation analysis was carried out on the slope after excavation and support,and its stability was analyzed from the aspects of horizontal displacement,stress and vertical displacement,stress cloud map and so on.The results show that:(1)The stability coefficient of the slope after excavation is low,which fails to meet the standard requirements.The potential failure mode is sliding failure along the boundary surface of the rock layer,and the foot part of the slope is the area subject to maximum stress.(2)After bolting,the displacement of the slope is significantly reduced,the horizontal direction is more obvious than the vertical direction,and the stability coefficient meets the standard requirements.(3)It can be seen from the stress cloud map that the anchorage segment of the bolt is obviously subject to shear stress,and the bolt connects the rock strata with different degrees of weathering to make it in a relatively stable state.