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| MONITORING ANALYSIS OF FISSURE DEVELOPMENT EVOLUTION AND HEIGHT OF OVERBURDEN FAILURE OF HIGH TENSION FULLY-MECHANIZED CAVING MINING |
| ZHANG Yujun1，2，LI Fengming3 |
| (1. Coal Mininng and Designing Department，Tiandi Science and Technology Co.，Ltd.，Beijing 100013，China；2. Mining and Designing Branch，China Coal Research Institute，Beijing 100013，China；3. Tangshan Research Institute，China Coal Research Institute，Tangshan，Hebei 063012，China) |
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Abstract 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.
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Received: 25 February 2010
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2011, Vol. 30 
