断层影响下无煤柱自成巷围岩运动及矿压规律  

Surrounding rock movement and pressure distribution laws of non-pillar mining with entry automatically retained by roof cutting influenced by faults

作　　者：杨军[1] 付强 高玉兵 高海南 乔博文 YANG Jun;FU Qiang;GAO Yubing;GAO Hainan;QIAO Bowen(State Key Laboratory for Geomechanics and Deep Underground Engineering,School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室力学与建筑工程学院

出　　处：《中国矿业大学学报》2019年第6期1238-1247,共10页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51674265);中国博士后科学基金项目(2019M650896);国家重点研发计划项目(2018YFC0603705)

摘　　要：为了探究断层构造对切顶卸压无煤柱自成巷技术的影响,采用力学分析、数值模拟和现场工程试验相结合的研究方法,对切顶卸压自动成巷工作面过正断层过程中的应力演化特征及围岩运动规律进行了深入研究.研究表明:在正断层作用下,工作面于上盘开采并靠近断层时,上覆岩层呈倒楔状,工作面前方应力及留巷实体煤帮侧应力逐渐增大,留巷围岩变形剧烈.在断层处时,上覆倒楔状覆岩应力传递至下盘和工作面端头留巷煤帮侧,断层带易活化、破碎及易滑移的特性导致断层处留巷围岩变形最大.工作面过断层后,上覆岩层呈正楔状,此时工作面前方和留巷实体煤帮侧应力变小,但由于此时留巷位于断层破碎带下方,上盘倒楔状岩层应力向下盘传递,导致留巷变形依然较大.断层带影响范围约为其前后70 m,该范围内成巷围岩需重点控制.To explore the influence of faults on the non-pillar mining technology with entry automatically retained by roof cuttingand pressure release, mechanical analysis, numerical simulation and field engineering test methods were adopted to study the stress evolution characteristics and surrounding rock movement laws around the working face. The results show that under the influence of normal faults, the overlying strata was inverted wedge-shaped when the upper wall face approached to the fault.The stress in front of the working face and in the solid coal side of the retained entry gradually increased, causing the surrounding rock of the retained roadway to be intensively deformed.As the upper wall face reached the fault, the overburden stress of the overlying strata was transmitted to the lower wall and the side of the retained roadway at the end of the working face.The fault zone, which was easily activated, breakable and slip by its nature, caused the deformation of the roadway surroundings to be maximum.When the working face arrived at the footwall of the fault, the overlying strata was wedge-shaped. At this time, although the stress in the front of the mining face and the solid side of the retained roadway was smaller,the deformation of the entry surrounding rock was still large owing to the fractured fault zone and the stress transfer from the inverted wedge strata in the upper wall to the down wall.The influenced range of the fault zone was about 70 m before and after the fault, and in the influenced range, development of the control techniques for the entry surrounding rock should be placed emphasis on.

关 键 词：断层 无煤柱开采 切顶卸压 围岩运动 巷道控制 

分 类 号：TD353[矿业工程—矿井建设]