特厚煤层沿空掘巷围岩支卸协同控制技术  

Surrounding rock control technology with synergetic support and pressurerelief for gob-side entry driving in extra-thick coal seam

作　　者：李化敏[1] 王文强 王祖洸 孙浩 LI Huamin;WANG Wenqiang;WANG Zuguang;SUN Hao(School of Civil and Engineering,Henan University of Technology,Jiaozuo 454000,China;Majialiang Coal Company Joint-stock by Datong Coal Mine Group and Zhejiang Provincial Energy Group Co.,Ltd.,Shuozhou 036000,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]同煤浙能麻家梁煤业有限责任公司,山西朔州036000

出　　处：《煤炭工程》2024年第2期45-51,共7页Coal Engineering

摘　　要：针对特厚煤层小煤柱沿空掘巷大范围塑性全煤巷道锚网索的支护难题,以塔山煤矿8204-2小煤柱工作面为工程背景,采用现场实测、理论分析等方法,揭示了锚杆、锚索对沿空大范围塑性全煤巷道的支护机理。锚杆支护主要作用于浅部二次破碎区煤体,形成浅部连续承载结构;锚索主要作用于深部处于三向受力状态的稳定煤体,形成更大范围的连续稳定承载结构;进一步明确了锚杆、锚索有效长度的计算方法,形成了以高预紧力、高强“锚-网-索”支护为基础,以坚硬顶板井下磨料水射流切顶卸压、巷帮大直径钻孔卸压、底板卸压槽卸压为辅的“支卸协同”小煤柱沿空巷道围岩控制技术体系。工程应用结果表明,试验巷道围岩最大变形量小于700 mm,能够满足使用要求。In order to solve the supporting problem of gob-side roadway in large scale plastic zone of whole coal using anchormesh-cable,taking the 8204-2 small coal pillar working face of Tashan Coal Mine as engineering background.We revealed the supporting mechanism of bolt and anchor cable for large-scale plastic zone of gob-side roadway.The bolt support acts on shallow secondary crushing area of surrounding rock,forming shallow continuous load-bearing structure;anchor cable acts on the stable surrounding rock in deep three-way stress state to form a larger range of continuous stable bearing structure.Based on this,the calculation method of effective length of bolt and anchor cable was further clarified.And the synergetic control technology of surrounding rock for gob-side entry driving in extra-thick coal seam was formed,based on the support of anchormesh-cable with high pre-tightening force and high strength,and using abrasive water jet roof cutting pressure relief in hard roof,large diameter borehole pressure relief in roadway side,floor pressure relief slotting relief as auxiliary.The engineering application results show that,the maximum deformation of surrounding rock of test roadway was less than 700 mm,which met the use requirements.

关 键 词：特厚煤层 小煤柱 沿空掘巷 围岩控制 支卸协同 双层连续承载结构 

分 类 号：TD322[矿业工程—矿井建设]