Mine pressure distribution and surrounding rock control of gob-side entry formed by roof cutting and pressure release under the influence of faults#br#
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology (Beijing)，Beijing 100083，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China)
Abstract：In this study，a field engineering experiment was conducted in a fault-affected roadway of 9101 mining face in Xiashanmao coal mine，and the distribution laws of mine pressure and control techniques of the roadway surroundings were studied by numerical simulation and field monitoring. The results indicate that the entry retaining process shows obvious staged characteristics when crossing a fault. When the mining face is in the transition region of the hanging wall and footwall，the stability of the roadway and distribution laws of the mine pressure are quite different from those under a conventional geological condition. The abutment pressure of the mining face near the fault is appropriately 55.1% higher than that of the conventional geological condition. When the mining face crosses the fault，the abutment pressure experiences a sudden drop owing to the decrease of the stress transmission between the hanging wall and the footwall. In the fault-affected area，the average load of hydraulic supports，the pressure of the temporary support and the stabilized distance of the retained entry respectively increase appropriately 47%，20.5% and 13 m compared with those in the fault-unaffected area. To address the strong pressure and large deformation problems in fault-affected roadways，a “roof cutting and rib control support + door-type support + single prop” support strategy was proposed to control the roof deformation，a “W-type steel band and NPR cable” support strategy was used to control the coal rib deformation，and connective U-type steels were used to control the gangue rib deformation. Field test shows that，after using the new support system，the roof，coal rib and gangue rib deformations decrease by 74%，72% and 71%，respectively. The deformations of the entry surroundings were effectively controlled in the fault-affected area after using the new techniques.
高玉兵1，2，王 炯1，2，高海南1，2，杨 军1，2，张 勇1，2，何满潮1. 断层构造影响下切顶卸压自动成巷矿压规律及围岩控制[J]. 岩石力学与工程学报, 2019, 38(11): 2182-2193.
GAO Yubing1，2，WANG Jiong1，2，GAO Hainan1，2，YANG Jun1，2，ZHANG Yong1，2，HE Manchao1. Mine pressure distribution and surrounding rock control of gob-side entry formed by roof cutting and pressure release under the influence of faults#br#. , 2019, 38(11): 2182-2193.
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2019, Vol. 38 
