极软煤层动压巷道围岩大变形特征及全锚索支护技术研究  

Large deformation characteristics and full cable support technology of dynamic pressure roadways in extremely soft coal seams

作　　者：孙利辉 张海洋 张小建 穆彦鹏 王坤 杨贤达 杨本生 蓝成仁 SUN Lihui;ZHANG Haiyang;ZHANG Xiaojian;MU Yanpeng;WANG Kun;YANG Xianda;YANG Bensheng;LAN Chengren(College of Mining and Geomatics Engineering,Hebei University of Engineering,Handan,Hebei 056038,China;Key Laboratory of Mine Geological Hazards Mechanism and Control,Xi’an,Shaanxi 710054,China;Collaborative Innovation Center of the Comprehensive Development and Utilization of Coal Resource,Hebei Province,Handan,Hebei 056038,China;Handan Yunjialing Mine,Jizhong Energy Resource Co Ltd,Handan,Hebei 056302,China;Handan Guoerzhuang Mine,Jizhong Energy Resource Co Ltd,Handan,Hebei 056305,China)

机构地区：[1]河北工程大学矿业与测绘工程学院,河北邯郸056038 [2]矿山地质灾害成灾机理与防控重点实验室,陕西西安710054 [3]河北省煤炭资源综合开发与利用协同创新中心,河北邯郸056038 [4]冀中能源股份有限公司邯郸云驾岭矿,河北邯郸056302 [5]冀中能源股份有限公司邯郸郭二庄矿,河北邯郸056305

出　　处：《采矿与安全工程学报》2021年第5期937-945,共9页Journal of Mining & Safety Engineering

基　　金：河北省重点研发计划项目(19275508D);国家自然科学基金项目(51874113,52074100);矿山地质灾害成灾机理与防控重点实验室开放基金项目(KF2018-07)。

摘　　要：极软煤层回采巷道巷帮变形破坏严重,传统锚网索支护无法有效控制巷道稳定,常常出现前掘后修的问题。以郭二庄矿22311工作面回风巷煤帮强烈变形问题为背景,分析极软煤体物理力学特征及破碎机理,研究巷道煤帮强烈大变形规律,提出巷道短锚索支护+长锚索补强的全锚索加固技术。结果表明:煤体表观上结构致密,实则其内部孔隙由大量的黏土矿物填充,致使煤体极易发生崩解破坏,煤体原始强度及开采扰动后残余强度均较低;煤样在外载荷作用下内部会形成竖向贯通性X型裂隙,巷帮煤体在该裂隙扩展中形成由外向内的渐进性滑移破坏线,导致巷帮部分锚杆失效、锚索破断;巷道全锚索支护较原锚杆支护围岩支护强度提高了1.67倍,煤体承载能力得到了加强,锚固结构控制围岩范围增大了近1倍,抑制了围岩滑移破坏。现场试验表明:巷道围岩变形满足正常使用要求,锚索受力在合理载荷范围内。全锚索支护技术是极软弱煤岩体巷道支护的重要方法之一。Due to serious deformation and destroy of roadway in extremely soft coal seams,traditional bolt-mesh-cable support cannot effectively ensure roadway stability and immediate repairs are often needed after excavation.With strong deformation of return laneway rib in working face 22311 of Guoerzhuang Coalmine as background,physical and mechanical characteristics and crushing mechanism of extremely soft coal were analyzed,strong and large deformation law of roadway rib was studied,and full cable support technology of“short cable support+long cable reinforcement”was proposed.The results have shown that surface structure of the coal is dense,but in fact its internal pores are filled with clay minerals,so the coal is easy to disintegrate,and its original strength and residual strength after mining disturbance are low.Under external load,coal sample forms a vertically interconnective X-shape crack in the interior.During crack expansion,a progressive sliding failure line forms from outside to inside in the coal of roadway rib,which leads to the failure of some bolts and cables.Compared with original bolt-mesh-cable support,supporting strength of surrounding rock increases by 167%,bearing capacity of coal is strengthened,the surrounding rock control range of anchor structure increases nearly by 100%,and sliding failure of surrounding rock is inhibited.The field tests have shown that deformation of surrounding rock ensures normal use of roadway during its service period,and force of cable is within reasonable load range.The full cable support technology is an important method of roadway support in extremely soft coal and rock mass.

关 键 词：极软煤层 煤体大变形 滑移变形 前掘后修 全锚索支护 

分 类 号：TD353[矿业工程—矿井建设]