地表水体下大采高工作面重复采动安全性评价  

Safety evaluation of repeated mining in large mining height working face under surface water body

作　　者：续亚利 赵宝峰 Xu Yali;Zhao Baofeng(Guoneng Ningxia Coal Industry Hongshiwan Coal Mine Co.,Ltd.,Yinchuan 750409,China;China Coal Technology And Engineering Group Xi'an Research Institute Co.,Ltd.,Xi'an 710054,China)

机构地区：[1]国能宁夏煤业红石湾煤矿有限责任公司,宁夏银川750409 [2]中煤科工西安研究院(集团)有限公司,陕西西安710054

出　　处：《煤炭与化工》2024年第8期67-71,76,86,共7页Coal and Chemical Industry

基　　金：国家自然科学基金(41807221);陕西省自然科学基础研究计划(2018JQ5150)

摘　　要：为了确定地表水体下大采高工作面重复采动的可行性和安全性,采用FLAC3D数值模型,对宁东煤田红石湾煤矿五煤和八煤重复采动后的覆岩破坏规律进行研究,五煤和八煤工作面均为大采高工作面,采高分别为4.6 m和4.8 m,根据数值模拟结果,五煤和八煤工作面回采后的冒落带高度分别为13.8 m和15.0 m,八煤工作面的导水裂隙带高度为242.0 m,保护带厚度为56.4 m,八煤工作面最浅处距离地表水体353.0 m,大于需要留设的防隔水煤(岩)柱高度(298.4 m),结合研究区的构造发育条件和隔水层隔水性能特征,确定地表水体下五煤和八煤的大采高工作面重复开采的安全性较高。结果表明,可以采用数值模型对大采高工作面重复开采后的覆岩破坏规律进行分析,通过实例分析,地表水体下大采高工作面重复采动安全性评价符合实际情况,可以作为井田未来评价工作面受地表水体威胁程度的依据。In order to determine the feasibility and safety of repeated mining in working face with large mining height under surface water body,FLAC3D numerical model was used to study the failure law of overlying strata after repeated mining of No.5 coal and No.8 coal in Hongshiwan Coal Mine of Ningdong Coalfield.The working faces of No.5 coal and No.8 coal were both large mining height working faces,and the mining heights were 4.6 m and 4.8 m,respectively.According to the numerical simulation results,the heights of caving zones after mining of No.5 coal and No.8 coal working faces were 13.8 m and 15.0 m,respectively.The height of water conduction fracture zone of No.8 coal working face was 242.0 m,and the thickness of protective zone was 56.4 m.The shallowest part of No.8 coal working face was 353.0 m away from the surface water body,which was greater than the height of the waterproof coal(rock)pillar(298.4 m).Combined with the structural development conditions of the study area and the water-resisting performance characteristics of the aquifuge,it was determined that the safety of repeated mining of the large mining height working face of No.5 coal and No.8 coal under the surface water body was high.The results showed that the numerical model could be used to analyze the failure law of overburden rock after repeated mining of large mining height working face.Through case analysis,the safety evaluation of repeated mining of large mining height working face under surface water body was in line with the actual situation,which could be used by field as the basis for evaluating the threat degree of working face by surface water body in the future.

关 键 词：地表水体 大采高工作面 导水裂隙带 数值模拟 重复采动 

分 类 号：TD74[矿业工程—矿井通风与安全]