层状岩体不同倾角对高地应力隧道稳定性影响分析

摘要

Based on the high geostress layered rocks tunnel,the impact on high geostress tunnels stability with layered-rock dips have been analyzed by the numerical simulation method.The results are shown as follows:Compared with the normal geostress tunnel, high geostress tunnel’s support structure was under bigger load,the tunnel’s stability issues will be more prominent;with the rock dip’s rise in 25°~65°scope,the anchors’ axial force was increased obviously.Combined with the analysis results,the anchor is in-tersected with layered rocks in large angle,which can be linked up with more layers,the resistance between layers of rock mass will be increased,and the possibility of the inter-laminar shear rupture is reduced,the role of pin bolt was fully played,the supporting structure’s load is reduced and the stability of the surrounding rock is enhanced.%以层状岩体高地应力隧道为工程背景，采用数值模拟的方法，分析层状岩体的不同倾角对高地应力隧道稳定性的影响。研究结果表明：高地应力隧道相对于普通地应力隧道，其支护结构承受的荷载更大，隧道的稳定性问题更加突出；在25°~65°范围内，锚杆轴力随岩层倾角增大而增大的趋势明显。结合分析结果，通过将锚杆与岩层大角度相交，使多层岩体串联，从而增大了岩体层间阻力，减小了层间剪切错动的可能性，使锚杆充分发挥销钉的作用，减小了支护结构受力，增强了隧道围岩的稳定性。