层状岩体不同倾角对高地应力隧道稳定性影响分析  

Analysis of impact on the stability of high-geostress tunnels with layered rocks dips

作　　者：柳厚祥[1] 郑智雄[1] 胡勇军[1] 赵明纲[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410004

出　　处：《交通科学与工程》2014年第2期46-50,共5页Journal of Transport Science and Engineering

基　　金：湖南省教育厅科研基金资助重点项目(10A007)

摘　　要：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。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 intersected 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 interlaminar 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.

关 键 词：岩层倾角 高地应力隧道 数值模拟 锚杆优化 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]