不同倾角和层厚的层状围岩隧道稳定性数值分析

摘要

为了研究层状围岩隧道开挖后围岩稳定性与层状岩体的层厚、倾角之间的关系,采用离散元分析软件UDEC,在不同倾角和层厚条件下,分析了层状围岩隧道开挖后围岩的变形规律和受力特征,研究了不同倾角、不同层厚对层状围岩隧道稳定性的影响.结果表明:当层厚和开挖跨度相同时,隧道围岩的竖向位移、水平位移和最大主应力随着结构面倾角的增大表现出先增大后减小的规律.当倾角和开挖跨度相同时,随着层厚的增加,隧道围岩竖向位移、水平位移和最大主应力均出现逐渐减小的趋势.%The relationship between the stability of layered surrounding rock tunnel and the thickness and inclination of the layered rock is studied.With the discrete element analysis software UDEC,the deformation and stress characteristics of layered surrounding rock tunnel are analyzed at different inclination and with different thickness after the tunnel excavation.The stability of the layered surrounding rock tunnel is also studied.The results show that when the thickness and excavation span are fixed,the vertical displacement,horizontal displacement and maximum principal stress of layered surrounding rock tunnel increase first and then decrease with the increase in the inclination of the structural plane and when the inclination and excavation span are fixed,the vertical displacement, horizontal displacement and maximum principal stress tend to decrease with the increase in the layer thickness.