岩爆应力状态研究

ON THE STRESS STATE IN ROCK BURST

通过地下洞室围岩的应力状态分析和真三轴压缩试验，研究了岩爆应力状态及其在围岩中的极限深度问题。研究结果表明，片状劈裂岩爆是在双轴压缩应力状态作用下在洞壁面上产生；剪切错动型岩爆是在真三轴应力状态下在围岩内部产生；围岩内部存在着产生岩爆的极限深度区，极限深度的深浅取决于地应力场中的垂直和水平主应力的比值大小。

By means of the stress state analyses on the rockmass surrounding underground openings and truely triaxial compressive testing,the stress state of rock burst and the limiting deprh of rock burst in rocks are studied. The research results show that the rock burst of flake-splitting patern takes place around the opening's surface under the biaxial compressive stress state whereas that of shearing-dislocation patern takes place inside the rockmass. There exists a rock burst zone with a limitins depth dependent upon the ratio of the vertical principl stress to the horizontal one of the geostress field.