1706-1工作面砂砾含水层下安全煤岩柱的留设
Safety Coal and Rock Pillar Design Under the Gravel Aquifer of 1706-1 Working Face
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摘要: 为了实现多伦协鑫煤矿1706-1工作面在水体下安全回采，通过“两带”高度经验公式预计、“两带”高度实测、相似模拟试验以及FLAC3D数值模拟确定工作面的垮采比和裂采比；根据安全煤岩柱的留设要求及基岩厚度，反算出工作面安全回采厚度。结果表明：选取实测值垮采比5.61、裂采比12.21预计工作面覆岩破坏“两带”高度较合理；工作面安全回采厚度分开切眼到分界线区域采放厚度为8.9 m和距停采线480 m的“底砾区”采放厚度为4.7 m 2个区域；预计1706－1工作面最大涌水量27.75 m3/h，正常涌水量25.66 m3/h远小于矿井排水设备的正常排水量，因此，不会造成淹矿井事故，工作面可正常回采。Abstract: In order to realize safe mining under the water of 1706-1 working face in Duolunxiexin Coal Mine,the collapse-production ratio and crack-production ratio of working face were determined by "two zones" height empirical formula expectation, "two zones" height measurement, similar simulation test and FLAC3D numerical simulation. Based on the coal pillar design security requirements and bedrock, the safety mining thickness of working was calculated. The results showed that "two zones" height estimation of working face overburden rock failure was more reasonable by the measured values of collapse production ratio 5.61 and crack production ratio 12.21. The working face safety mining thickness could be divided into two pieces, including the thickness 8.9 m which was from cut open to the boundary area and 4.7 m which was 480 m away from the stopping line "bottom gravel area". The maximum water estimation amount of 1706-1 working face was 27.75 m3/h, normal water amount was 25.66 m3/h which was far more less than the normal water amount of coal mine water drainage device. Therefore, it would not cause coal mine flooded accidents, the normal mining could be carried out in working face.
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