断层构造影响下切顶卸压自动成巷矿压规律及围岩控制

doi:10.13722/j.cnki.jrme.2019.0617

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摘要以下山峁煤矿9101工作面回风顺槽过断层留巷为工程背景，开展断层构造影响下切顶成巷现场工程试验，并重点研究该条件下的矿压分布规律及围岩控制技术。研究表明，断层构造影响下，成巷过程具有明显的阶段性特征。当工作面于盘间过渡开采时，由于断层构造本身的易活化性导致留巷稳定性及矿压分布规律较常规开采有显著区别。断层构造带附近，工作面超前支承压力较常规地质条件增大约55.1%。工作面过断层后，由于盘间滑移传递力减小，工作面超前支承压力出现突降现象。工作面内，断层影响下的来压波动更剧烈，支架平均荷载较常规地质条件增大了约47%。滞后工作面成巷区，临时支护结构受力较常规地质区增大了约20.5%，碎石帮趋于稳定的距离较常规地质区增加了约13 m。针对断层影响区压力强、变形大的特点，提出巷内采用“切顶护帮支架+ 门式支架+单体支柱”为主的临时支护技术，实体煤帮采用“W钢带+NPR恒阻锚索”为主的控帮技术，碎石帮采用连体式U型钢进行挡矸支护。采用新型支护体系后，顶板最终变形较常规支护减少了约74%，实体煤帮变形减少了72%，碎石帮变形减少了约71%，巷道围岩变形得到有效控制。

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	高玉兵1
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	王炯1
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	高海南1
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	杨军1
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	张勇1
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	何满潮1

关键词 ：采矿工程, 断层构造, 切顶卸压, 无煤柱开采, 矿压规律, 巷道围岩控制

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.

Key words： mining engineering fault structure roof cutting and pressure release nonpillar mining laws of mine pressure roadway surrounding rock control

引用本文:

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.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0617 或 http://www.rockmech.org/CN/Y2019/V38/I11/2182

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