摘要
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。
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 from one or two-dimensional stress state. The primary aim of laneway support is how to control the development of shear band. When we design bolt support, if bolt＇s function is suspension, and the anchorage zone is in shear band, so this kind of bolt support is unstable.
出处
《山西煤炭》
2010年第3期49-51,共3页
Shanxi Coal
关键词
岩石破坏
剪切应力
破坏准则
巷道
rock failure
shear stress
failure criterion
laneway
