剪应力对巷道破坏影响的研究

根据岩石破坏的库仑-莫尔强度准则,分析了巷道围岩的剪应力分布规律及其导致岩体破坏的机理.研究表明:在巷道围岩内存在一个应力剪切带,剪切带内具有较大的主应力差值,该区域岩体有发生破坏的趋势.剪切带是围岩应力状态的过渡区域,它使围岩从单向、双向应力状态过渡到稳定的三向应力状态.巷道支护的原则就是控制剪切带的发展.在锚杆支护设计中,若锚杆主要起悬吊作用,而锚杆的锚固区若处于剪切带内,那么对围岩的支护将是不可靠的.

Influence of Shear Stress on The Failure of Laneway

Based on the Coulomb-Mohr strength criterion of rock failure,analyzed the distribution rule of the shear stress of laneway surrounding rock mass and the failure mechanism of rock mass.The research results show that:there is a obvious stress shear band in laneway surrounding rock mass,and the surrounding rock mass has failure tendency.The shear band is a transition area of the stress state of surrounding rock mass,it make the stress state of surrounding rock mass transfer to three-dimensional stress state fr...