近距离煤层群上行式开采悬空结构稳定性研究  

Study on stability of dangling structure in ascending mining contiguous coal seams

作　　者：王寅 付兴玉 孔令海 赵阳 张宁博 WANG Yin;FU Xingyu;KONG Linghai;ZHAO Yang;ZHANG Ningbo(School of Energy and Mining Engineering,China University of Mining and Technology-Beijing 100083,China;China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization,Beijing 100013,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]煤炭科学技术研究院有限公司,北京100013 [3]煤炭资源高效开采与洁净利用国家重点实验室,北京100013

出　　处：《煤炭科学技术》2020年第12期95-100,共6页Coal Science and Technology

基　　金：国家重点研发计划资助项目(2017YFC0804205);国家自然科学基金资助项目(51874176);天地科技股份有限公司科技创新创业资金专项资助项目(2019-TD-QN018)。

摘　　要：为解决上行式开采工作面推进至下部煤层采空区开切眼附近的底板下沉风险问题,选取新疆龟兹矿业西井A6-103典型上行式开采工作面,采用理论分析和相似模拟方法,通过研究上行式开采重复采动下顶底板结构形态,得到覆岩破断机制,并提出了"上行式开采三铰拱式结构"。结果表明:近距离煤层群上行式开采工作面通过下部煤层采空区开切眼上方前会逐渐形成特殊块体结构,该结构以下部煤层开采而产生的预定裂隙位置为中间铰接点,且只能靠层间岩层关键层形成的悬空结构提供支撑才能保持稳定,并得到了该模型稳定条件判据及计算方程。另通过相似模拟结果,证明了该结构在上述条件回采过程中无法保持稳定,下部煤层采空开区切眼边界处的悬空结构会发生二次失稳,使得上行式开采工作面顶底板突然垮断。最后提出了针对性的防治措施,保证了工作面的安全回采。In order to solve the problem of floor subsidence risk when the ascending mining face is pushed into the goaf ope-off cut hole of the lower coal seam,a typical ascending mining face A6-103 in the west well of Guici Mine in Xinjiang Uygur Autonomous Region was selected,and the overburden fracture mechanism was obtained by studying the structure form of the lower roof and floor of the ascending mining with Repeated mining by theoretical analysis and similarity simulation method,and the ascending mining with three-hinged arch structure was proposed.The results show that a special block structure is gradually formed in the up-mining working face of the close coal seam group through the upper cutting hole of the goaf in the lower coal seam,and the predetermined fracture position generated by the mining of the coal seam below the structure is the intermediate hinge point.The structure can only maintain stability by relying on the support of the dangling structure formed by the key stratum in the inter-layer strata,and the stability criterion and calculation equation of the model are obtained.Through similar simulation results,it is proved that the structure cannot maintain stability in the process of stoping under the above conditions,and the suspended structure at the goaf cut boundary of the lower coal seam will suffer secondary instability,resulting in the sudden collapse of the roof and floor of the upstream mining face.At the same time,the corresponding prevention and control measures are put forward to ensure the safety of mining.

关 键 词：近距离煤层群 上行式开采 关键层 悬空结构 三铰拱式结构 

分 类 号：TD323[矿业工程—矿井建设]