深井临空高应力巷道切顶卸压机理研究  

Mechanism of roof cutting and pressure relief in gob-side and high-stress roadway in deep coal mine

作　　者：苏超 弓培林[1] 康红普[2,3] 李超[1] 伊康 刘畅[2,3] 李鹏 SU Chao;GONG Peilin;KANG Hongpu;LI Chao;YI Kang;LIU Chang;LI Peng(College of Mining Technology,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Coal Mining and Designing Branch,China Coal Research Institute,Beijing 100013,China;Coal Mining and Designing Department,Tiandi Science and Technology Co Ltd,Beijing 100013,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Department of Mining Engineering,Shanxi Institute of Energy,Jinzhong,Shanxi 030600,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024 [2]煤炭科学研究总院开采研究分院,北京100013 [3]天地科技股份有限公司开采设计事业部,北京100013 [4]中国矿业大学(北京)能源与矿业学院,北京100083 [5]山西能源学院采矿工程系,山西晋中030600

出　　处：《采矿与安全工程学报》2020年第6期1104-1113,共10页Journal of Mining & Safety Engineering

基　　金：国家重点研发计划项目(2017YFC0603003);“十二五”国家科技支撑计划项目(2012BAB13B04);山西省应用基础研究项目(201801D221356)。

摘　　要：为揭示深井临空高应力巷道切顶卸压机理,以口孜东煤矿121302工作面机巷为工程背景,采用物理相似模拟与理论分析,研究深井临空巷道覆岩结构及运移规律,建立临空巷道采空区侧关键块B'的力学模型,得出关键块B'的稳定性判据。研究表明:深井临空巷道覆岩会经历由长臂“F”型悬顶结构到短臂“F”型悬顶结构到最终形成双短臂“F”型悬顶结构的演化过程;采用人工切顶能够减弱双“F”结构的悬顶叠加效应并诱发顶板产生新的断裂线,沿断裂线的滑动变形释放较大的应力,且切落顶板能够更好地充填采空区,进而改善煤柱受力状态,减小巷道变形;经理论计算,口孜东煤矿121302工作面沿煤柱边缘切断关键块B',煤柱受力减小19.14%;井下试验监测表明,巷道变形量降低50%以上,切顶卸压应用良好。To delve into the mechanism of roof cutting and pressure relief in the gob-side roadway(GR)in deep coal mine,in this paper,with working face 121302 in the Kouzidong Coalmine as the engineering background and through physical similarity simulation and theoretical analysis,the overburden structure and migration law of GR in deep coal mine have been studied.The mechanical model of key block B'in the gob-side roadway has been built,and the stability criteria of the key block Bʹis obtained.The results have indicated that the overlying strata of the GR in the deep coal mine will experience the evolution from the long arm“F”-type hanging arch structure to the short arm“F”-type hanging arch structure and eventually evolve to the final formation of double short arm“F”type.In course of the evolution,the superposition effect of the double“F”structure can be reduced,and a new fracture line can be induced in the roof through the artificial roof cutting. The sliding deformation along the fault line can release considerable stress, helping the cut roof fill the mined-out area. Accordingly, the stress state of the coal pillar is improved, and the deformation of roadway is mitigated. According to the theoretical calculation, working face 121302 of the Kouzidong Coalmine cuts the key block B' along the edge of the coal pillar, and the force of the coal pillar can be down-regulated by 19.14%. The monitoring data demonstrates that the entry deformation is decreased by more than 50% and the roof cut and pressure releasing is applied well.

关 键 词：深井 临空高应力巷道 切顶卸压 相似模拟 

分 类 号：TD353[矿业工程—矿井建设]