论文部分内容阅读
在浅埋煤层砂土基型矿区实现保水开采,关键在于煤层开采后含水层和导水裂隙带之间有达到厚度要求的隔水保护层.采用开采损害学中的地表移动变形和采动岩体内部移动变形预计的方法,考虑覆岩中隔水黏土层的膨胀性计算浅埋煤层砂土基型矿区开采后隔水土层中裂隙的破坏深度,同时借鉴相似模拟实验确定导水裂隙带的发育高度,最后计算采高不同时2种裂隙之间的隔水保护层厚度,如果隔水保护层厚度满足规定要求就可以实现保水开采,从而确定砂土基型矿区保水开采的合理开采方法.以榆树湾煤矿20102上工作面开采为例,计算结果表明:5m分层开采可以实现保水开采,放顶煤一次采全高不能实现保水开采.现场开采实践和相似模拟实验验证了该方法的正确性.
The key point lies in the water-bearing protective layer which meets the requirement of thickness between the aquifer and the water-conducting fractured zone after the coal seam is mined.The surface movement deformation and the mining rock The method of predicting the internal deformation of the body and considering the expansibility of the water-bearing clay layer in the overburden rock are adopted to calculate the depth of the fractures in the water-retaining layer after excavation in the shallow coal seam sand mining area. Simultaneously, And then calculate the thickness of waterproofing protective layer between the two kinds of fractures when the mining height is not high. If the thickness of the waterproofing protective layer meets the stipulated requirements, the water-saving mining can be realized, so as to determine the reasonable mining method for water-holding mining in sand-based mining area. Taking the mining of face in 20102 at Yushuwan Coal Mine as an example, the calculation results show that 5m stratified mining can realize water-conserving mining, and the one-time full-height caving can not achieve water-saving mining.The field mining practice and similar simulation results verify the correctness of the method .