浅埋采空区大采高条件下覆岩破坏规律  

Failure of overburden rock under large mining height in shallow buried goaf area

作　　者：张纪星 师修昌 ZHANG Jixing;SHI Xiuchang(Geological Survey of Jiangsu Province,Nanjing,Jiangsu 210018,China;BIM Technology and Intelligence Construction in Henan Engineering Laboratory,Henan University of Economics and Law,Zhengzhou,Henan 450046,China)

机构地区：[1]江苏省地质调查研究院,江苏南京210018 [2]河南财经政法大学BIM技术与智慧建造河南省工程实验室,河南郑州450046

出　　处：《中国地质灾害与防治学报》2019年第5期92-97,共6页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金项目(41372163);河南高等学校重点科研项目(19B170003)

摘　　要：浅埋采空区下远距离煤层开采覆岩破坏直接影响本煤层工作面安全开采和上覆采空区稳定性。针对神东矿区大柳塔煤矿开采实际,采用相似模拟试验、数值计算和现场实测方法研究了2^-2煤采空区下伏的5^-2煤层开采覆岩运动及裂隙发育规律。研究结果表明,大柳塔煤矿5^-2煤层一次采全高开采,覆岩裂隙带贯穿层间岩层导通2^-2煤采空区,层间岩层的破断会诱发上覆岩层大面积垮落,工作面出现强烈的矿压显现,同时加剧了上覆采空区围岩结构失稳及地表沉陷。现场实测也表明大柳塔煤矿5^-2煤层大采高开采覆岩破坏高度137.32 m,裂采比20.2,与模拟结果一致。这些成果可以为大柳塔矿5^-2煤层工作面安全开采提供理论依据。Overburden failure of longdistance coal seam mining under shallowburied goaf directly affects the safety of mining and the stability of overlying goaf.In view of the actual coal mining situation of Daliuta Coal Mine in Shendong Mining Area,the overburden movement and fracture development law of No.5^-2 coal seam mining under No.2^-2 coal goaf are studied by physical simulation and numerical calculation method.The results show that when the No.5^-2 seam of Daliuta Coal Mine is fully exploited at one time,the overburden fracture zone penetrates the interlayer strata and leads to the No.2^-2 coal goaf.The breakage of the interlayer strata will induce the large-scale collapse of the overburden strata,and the strong strata pressure appearing in the working face will aggravate the structural instability of the surrounding rock and surface subsidence of the overburden goaf.Field measurements also show that the failure height of overburden is 137.32 m and the fracturing-mining ratio is 20.2 in 5^-2 seam of Daliuta coal mine,which is consistent with the simulation results.These results can provide theoretical basis for safe mining of No.5^-2 coal seam at Daliuta coal mine.

关 键 词：上覆采空区 远距离 大采高 覆岩破坏 裂隙演化 

分 类 号：TP82[自动化与计算机技术—检测技术与自动化装置]