厚土层区煤层开采红土隔水稳定性评价  

Evaluation of Water Separation Stability of Red Soil Coal Seam Mining in Thick Soil Layer Area

作　　者：许南南 荆秀艳[1] 马雄德[2,3] 王鹏翔 XU Nannan;JING Xiuyan;MA Xiongde;WANG Pengxiang(College of Geology and Environment,Xi′an University of Science and Technology,Xi′an 710054,China;College of Water and Environment,Chang′an University,Xi′an 710054,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region,Ministry of Education,Xi′an 710054,China)

机构地区：[1]西安科技大学地质与环境学院,西安710054 [2]长安大学水利与环境学院,西安710054 [3]旱区地下水文与生态效应教育部重点实验室,西安710054

出　　处：《煤炭技术》2023年第11期87-92,共6页Coal Technology

摘　　要：为评价薄基岩厚土层地质结构下煤层开采后红土层隔水稳定性,以某综采工作面为研究对象,通过钻探法和物理相似模拟研究了导水裂隙带高度,采用孔组抽水和水化学分析法评价了上覆红土层隔水稳定性。结果表明,综采放顶煤采煤条件下采厚9.57 m时,实测导水裂隙带高度为92.01~101.17 m,裂采比9.61~10.57,与临近矿区实测值相比,明显偏小。物理相似模拟预测结果为136.61 m,导水裂隙带高度位于红土层顶界,与实测值相比结果偏大。抽水试验和水质评价表明,采空区第四系松散含水层和直罗组风化基岩之间水力联系较弱,煤层开采对红土层的隔水稳定性影响较小。红土层对导水裂隙发育存在抑制作用,是薄基岩区保水开采的重要保障。In order to evaluate the water-isolation stability of the red soil layer after coal seam mining under the geological structure of thin bedrock and thick soil layer,taking a fully mechanized mining face as the research object,the height of the water-conducting fracture zone was studied by drilling method and physical similarity simulation,and the water-isolation stability of the overlying red soil layer was evaluated by the method of hole group pumping and hydrochemical analysis.The results show that when the mining thickness of fully mechanized caving mining is 9.57 m,the measured height of the water-conducting fracture zone is 92.01-101.17 m,and the fracture ratio is 9.61-10.57,which is obviously smaller than the measured value in the adjacent mining area.The predicted result of physical similarity simulation is 136.61 m,and the height of the water-conducting fracture zone is located at the top limit of the red soil layer,which is larger than the measured value.The pumping test and water quality evaluation show that the hydraulic connection between the quaternary loose aquifer and the weathered bedrock is weakin the goaf,and the coal seam mining has less impact on the water separation stability of the red soil layer.Red soil layer has some inhibitory effect on the development of the waterconducting fracture zone,which is an important guarantee for water conservation mining in thin bedrock areas.

关 键 词：隔水稳定性 导水裂隙带 物理相似模拟 抽水试验 保水采煤 

分 类 号：TD821[矿业工程—煤矿开采]