采矿与安全工程学报Issue(3)：363-368,375,7.DOI:10.13545/j.cnki.jmse.2015.03.003
新集二矿下组煤底板石灰岩层隔水性及应用研究
The impermeability of limestone aquifuge in bottom coal seam floor and its application in Xinji Second Coal Mine
摘要
Abstract
Limestone layer is often regarded as the main cause of coal mine water damage and water inrush events, which actually happened more than once in old mining area in Huainan. A conception has been put forward that reconstruction or direct utility of relative impermeability of floor limestone layer can solve the problem of high water pressure and thin aquiclude and ensure safety during mining under pressure. Xinji Second coal mine has been selected as the research field which is located in the southern edge of the midwest coalfields and comprehensive methods have been used to research including the index test of rock composition, chemical action of compositions of groundwater, and rock mechanic, micro-pore structure, the laboratory experiment about permeability and the field test about hydrogeolog-ic drilling, geophysical prospecting. The research results show that:1) Xinji Second Coal Mine is cut by faults all around, with the top covered by quaternary system and metamorphic nappe. The in-situ stress changes from tensile in the shallow part to compressive at a depth under 500 m. The crack of deep rock layer is not easy to open up. 2) The hydrochemical type is Cl-Na. Salinity is greater than 1.5 g/L and rock voids is filled by the precipitation. 3) The permeability and water rich property of limestone floor is poor, so it can be regarded as aquiclude. It is confirmed that inrush boreholes mostly close to the large faults and water yield is small and disappear quickly through boreholes in the coal mine. Safe mining of the first coal mining face and safety tunneling of the second working face testify the result that the floor limestone layer is aquiclude and the water-resisting key strata after reconstruct is correct.关键词
下组煤/石灰岩/隔水层/承压水Key words
bottom coal seam/limestone/aquifuge/pressed water分类
矿业与冶金引用本文复制引用
白海波,戎虎仁,杨城,韦晓琪,王延蒙,陈耀杰..新集二矿下组煤底板石灰岩层隔水性及应用研究[J].采矿与安全工程学报,2015,(3):363-368,375,7.基金项目
国家重点基础研究发展计划(973)项目(2013CB227900)；国家自然科学基金项目(50974115，50974107) （973）
