摘要
针对深部软岩巷道的支护问题,通过相似模拟和数值模拟对比分析了巷道分别在无支护、锚网索+钢棚支护以及置孔释压支护下的巷道变形情况。研究结果表明:无支护措施时的巷道变形在所受应力达到10 MPa时最大,巷道围岩的破坏状态也最为严重,顶板及两帮围岩的裂缝发生了贯穿,围岩局部甚至出现了坍塌现象;而在锚网索+刚棚支护作用下的巷道围岩抵抗高压的能力得到了明显提升,其在受力达到20 MPa才开始在巷道周围出现压缩破坏现象;而置孔释压支护下巷道围岩的承压能力得到了大大增强,其在所受应力达到30 MPa时依然可以保证巷道围岩表面的完整,不至于出现明显的裂缝和破坏。因此,置孔释压支护在改善高应力软岩巷道变形方面效果更优。
Aiming at the support problem of deep soft rock tunnels,compare and analyzes the deformation of tunnels under unsupported,anchor mesh cable+steel shed support,and hole pressure relief support conditions through similarity simulation and numerical simulation.The research results indicate that the deformation of the roadway without support measures is maximum when the stress reaches 10 MPa,and the failure state of the surrounding rock of the roadway is also the most severe.Cracks in the roof and two sides of the surrounding rock have penetrated,and local collapse phenomena have even occurred in the surrounding rock;under the action of anchor mesh cable and rigid shed support,the ability of the surrounding rock of the tunnel to resist high pressure has been significantly improved.It only begins to show compression failure around the tunnel when the force reaches 20 MPa,and the failure trend is splitting;The pressure bearing capacity of the surrounding rock of the tunnel under the pressure relief support with holes has been greatly enhanced.When the stress reaches 30 MPa,it can still ensure the integrity of the surface of the surrounding rock of the tunnel,without obvious cracks and damage.This is because the pressure relief material with holes will release the pressure before reaching the support limit through its own displacement and contraction when under pressure,it is precisely because of its ability to release pressure and absorb energy that the stress state of the surrounding rock of the tunnel has been improved.Therefore,the effect of setting holes to release pressure support is better in improving the deformation of high stress soft rock tunnels.
作者
陈晓轩
李彦斌
李立功
CHEN Xiaoxuan;LI Yanbin;LI Ligong(School of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Economics and Management,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《煤炭技术》
CAS
2024年第3期36-41,共6页
Coal Technology
基金
山西省应用基础研究计划(20210302124440)。
关键词
深部巷道
置孔释压支护
相似模拟
数值模拟
deep tunnel
placing holes for pressure relief support
similar simulation
numerical simulation
