新集煤矿1号煤层开采可行性分析

Mining Feasibility Analysis of No.1 Coal Seam in Xinji Coalmine

淮南地区的山西组煤层是埋藏最深的一组可采煤层,1号煤层是山西组最下一层,煤层平均埋藏深度达到-600m。由于下伏石炭系太原统灰岩在区域上是承压含水层,压力达6.5MPa,1号煤层与太灰岩之间的砂质泥岩平均厚度为16m,存在极大的底板突水可能性,一直未能开采。因此,合理分析1号煤及下伏太灰岩的水文地质条件,是判断其开采可行性的最主要依据。通过对已有矿井地质资料分析,认为在查明各含水层之间的水力联系,矿井充水途径,下伏太灰岩富水水平分布规律的基础上,可以采用疏水减压、注浆加固含水层等手段开采1号煤层。

The coal-seam group in Shanxi Formation is the deepest mineable group in the Huainan area, No.1 coal seam in the Xinji coalmine is the nethermost with average buried depth of -600m. Since the underlying Taiyuan Formation limestone is high pressure confined aquifer, moreover, only average 16m sandy mudstone between the coal seam and limestone as confining bed, while head pressure can be 6.SMPa as high, thus very large floor water bursting possibility existed, the coal seam cannot be mined all along. Thus, to analyze hydrogeological condition of No.1 coal seam and underlying Taiyuan Formation limestone is essential to estimate mining feasibility. After analyzed available eoalmine geological data, considered that on the basis of ascertained hydraulic connection between aquifers, coalmine water filling path, underlying limestone water yield property horizontal distribution pattern, the No. 1 coal seam can be mined after to adopt measures of depressurizing through drainage, aquifer consolidating through grouting etc.