Thick Loose Aquifer Of Stope Structure On The Overburden Failure Law Affects Mechanism Research

This article dose an in-depth study in coal mine mining under a thick loosened aquifer with different structures on the overburden failure and migration law in Zhuxianzhuang. The article based on mastering the fourth aquifer rich water and sedimentary features, and through the laboratory analysis and theoretical analysis and similar material simulation test and numerical simulation and many other research tools. Main work:1. According to the on-site investigation, laboratory test results and the full study of the thick alluvium aquifer water abundance and sedimentary characteristics, the results show that the loose layer aquifer as weak to very weak aquifer, gravel containing cohesive soil covered the top of the coal-bearing strata with characteristics of low sand and high argillaceous. Played a good barrier effect of sand proof coal pillar.2. Based on similar material simulation and FLAC3D numerical simulation study and the analysis into the specific bedrock thickness the864face disposable caving mining, the intermittent stratification mining on overburden of fully mechanized slicing movement and failure effect. The results show that the maximum growth height of thick loose aquifers the one-time mining caving zone is27m, touched to the aquifer, the threat of water inrush; intermittent slice mining caving with a height of19.2m, The working face can be safe.3. Based on similar material simulation and FLAC3D numerical simulation study and the analysis into the specific bedrock thickness864face disposable caving mining, the different face length mining on overburden of fully mechanized slicing movement and failure effect. The results show that With the increase in the length of the face, the two with highly non-linear growth trend. Face length in the110m when layered caving with height increasing trend slowly; the face length greater than110m, the overlying strata failure serious condition, caving zone height increasing trend larger; Face length in the120m when under caving with height increasing trend slowly; the face length greater than120m, the overlying strata failure serious condition, caving zone height increasing trend larger. On the basis of the above study, mining the864face intermittent layered. Upper slice is3m, under stratified is6m and face length of upper slice is110m and face length of under strarifier is120m. While establishing the the specific the bedrock thickness conditions under bracket wall rock mechanics prediction model, reasonable working resistance of face, determined to provide a basis for stent selection and working resistance parameters.The research of exploitation on the thick loose aquifer seam with similar conditions has some significance on this mine, Huainan mine and Huaibei mine.