层状岩体边坡锚杆加固效应的数值分析

Numerical analysis for stratified rock slope stability reinforced by bolts

利用数值计算软件FLAC3D建立层状岩体边坡的稳定性分析模型,采用锚杆单元对岩体边坡进行加固模拟,得到加固后岩体的变形情况以及锚杆的受力情况。研究结果表明:边坡的破坏形式为明显的直线型滑动破坏,滑块的位移从上到下逐渐增大,水平位移最大处位于剪出口位置;层状边坡锚杆加固后,沿节理面发生一定的变形;各监测点位移沿自然坡倾向位置逐渐减小,越往岩体内部受到的开挖扰动越小;由于节理的存在,全长黏结式锚杆的轴力分布为多峰值曲线,峰值均出现在节理面位置;锚杆轴力最大位置可表征滑动面位置。

The stability analysis model was founded for the stratified rock slope by the numerical calculation software FLAC3D.The tri-spring bolt element was used to simulate the reinforcement of bolt in rock slope,to obtain the deformation of rock mass and stress distribution of bolt.The results show that the failure mode of the slope is the linear slippage,displacement of the slip block increases from the top to the bottom of slope,and the maximum horizontal displacement is located at the shear place of slope rock mass.After reinforced by the bolts,on the stratified rock slope,there will occur some certain deformation along the joint plane.The displacement of the monitoring points decreases along the slope natural surface,and the disturbance for the rock mass is decreased from the surface of slope to the internal of slope.There exist several peak values for the bolt axial stress along the bolt shaft due to the existence of the joint plane.Locations of the peak values are all at the place of joint plane,which indicates that the location of the maximum bolt axial stress can represent the slip surface location.