Monitoring analysis of fissure development evolution and height of overburden failure of high tension fully-mechanized caving mining

Taking Wangpo mine as the experimental mining, by borehole flushing fluid leakage and drilling colour television system, the height of overburden failure caving and fissure development evolution are monitoring. And then, the digital analysis and similarity simulation experiment of fissure development evolution are carried out. The research results show as followings: (1) The overburden failure height of high tension fully mechanized caving mining Wangpo mining is from 94.00 m to 104.92 m. (2) The main distribution characteristic of rock fissure is that the evolution of fissure is mainly with the high angle even vertical to the rock strata; the fissure evolution amount is square increasing with the buried depth; and the fissure width is normal distribution approximately with the fissure amount. (3) The fissure cluster region focus on before and after the coal wall; and the fissure density distribution curves of overlying strata are high at both ends, low of the middle, such as saddle-shaped.