近距离煤层下行开采条件下覆岩运移规律研究  

Study on law of in movement and deformation under downward mining in contiguous coal seams

作　　者：吕兆海[1,2] 赵长红[2] 岳晓军[2] 李立波[1,2] 靳华[1,2] 朱海鱼 

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]神华宁夏煤业集团有限责任公司,宁夏银川750004

出　　处：《煤炭科学技术》2017年第7期18-22,32,共6页Coal Science and Technology

基　　金：国家重点基础发展计划(973计划)资助项目(2015CB251602);国家自然科学基金项目(U1361206)

摘　　要：为得到清水营煤矿近距离煤层开采过程中,破断顶板层结构的形成、运动规律及能量演化特征,结合矿井地质资料,构建二维物理相似模型试验平台,基于全站仪、千分表、热红外成像等技术进行综合监测,并对破断顶板层结构形成的诱因及其扩展发育特征进行理论分析,得出近距离煤层下行开采过程中,二煤开采对其底板的破坏深度达10.05 m;三煤开采对上覆破断岩层造成二次扰动,覆岩整体下沉量为0.39 m,破断顶板层发育高度达到21.9 m;提出破断顶板层结构扰动下支架载荷由静态载荷与动态载荷构成,为保证工作面支护强度,需提高支架的工作阻力和初撑力;针对松散破断顶板层可采取工作面挂网作人工假顶、预注水泥砂浆固化顶板等方式提高顶板结构的完整性和承载力。In order to study the formation,movement,and energy exchange of the broken roof in the process of mining contiguous seams,a two-dimensional physical simulation model was built. Based on integrated monitoring of total station instrument,dial gauge and thermal infrared imagine,as well as theoretical analysis the causes of broken roof structure and its characteristics of rock mass development. The results show that during downward mining in close-distance seams,the damage depth to the secondary seam is 10.05 m; mining the third coal seam will caused induced disturbance on the stability of the strata,and subsidence amount is 0.39 m; the height of broken roof seam is 21.9 m. The conclusion is made that the load of support is composed of static load and dynamic load when disturbance from broken roof structure is at present. To ensure the support strength at the working face,the support resistance of the hydraulic support and setting load should be increased. To improve the integrity and bearing capacity of broken loose layer,an artificial roof can be made by applying steelwire reinforcement,or pre-grouting to stabilize and solidify the roof.

关 键 词：上覆煤层 下行开采 近距离煤层 破断顶板层 

分 类 号：TD323[矿业工程—矿井建设]