摘要
近距离滑动构造区应力环境复杂、围岩破碎严重,回采巷道支护难度大。通过对嵩山煤矿近距离滑动构造区回采巷道围岩变形破坏特征分析,探析了极软破坏回采巷道围岩控制变形力学机制与控制对策,提出了近距离滑动构造区破碎顶板回采巷道围岩控制技术,并进行了现场工业性试验。试验结果表明,破碎顶板回采巷道围岩变形破坏特征主要表现为巷道围岩整体大变形“O”型收敛、顶板呈块体冒落、底板大凸型鼓出;局部应力集中、大深度破碎围岩与支护方式不合理是巷道围岩失稳的主要原因;嵩山煤矿滑动构造区破碎顶板回采巷道为典型物化膨胀型—高应力集中—节理化、软弱夹层破碎顶板软岩巷道,其控制对策力学转化机制为Ⅰ_(AB)ⅡABDⅢ_(ABC)→ⅡABDⅢA→Ⅱ_(BD)→Ⅱ_(B);提出了三软煤层回采巷道锚杆(索)+注浆+型钢棚耦合差异化支护方案,2112工作面回采巷道采用设计方案后,围岩应力得到释放,围岩强度得到强化,巷道断面收敛率小于17.4%,巷道围岩稳定。
The complicated stress environment,serious broken surrounding rock,difficult enrty supporting have appeared in close-distance sliding structure area.In this paper,the deformation and failure characteristics of entry surrounding rock were analyzed in close-distance sliding structure area of Songshan Coal Mine,the mechanical mechanism and strategy for control deformation of entry weak-broken surrounding rock were explored,control technology of entry surrounding rock with broken roof in close-distance sliding structure area were put forward,and the industrial test was carried out.The results showed that the deformation and failure characteristics of the surrounding rock of the fractured roof mining roadway in the close range sliding structural area were mainly manifested as the overall large deformation of the surrounding rock of the roadway converging in an"O"shape,the roof falling in blocks,and the floor bulging out in a large convex shape;the main causes of surrounding rock failure were partial stress concentration,large depth broken surrounding rock and unreasonable supporting mode;the entry with fractured roof in sliding structure area of Songshan Coal Mine was a typical physical and chemical expansion type-high stress concentration-jointed,weak interlayer fractured roof soft rock roadway,and the mechanical transformation mechanism of control strategy wasⅠ_(AB)ⅡABDⅢ_(ABC)→ⅡABDⅢA→Ⅱ_(BD)→Ⅱ_(B);the coupling differential supporting scheme of bolt(cable)+grouting+steel shed was proposed for the entry in"Three-Soft"coal seams,after the scheme was adopted in 2112 working face,surrounding rock stress was released,the strength was strengthened,the convergence rate of roadway section was less 17.4%,and roadway surrounding rock was stability.
作者
苏金华
任金武
辛亚军
张继远
张盼
姬红英
Su Jinhua;Ren Jinwu;Xin Yajun;Zhang Jiyuan;Zhang Pan;Ji Hongying(Yonghua Energy Co.,Ltd.,Henan Energy and Chemical Group,Luoyang 471000,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo 454000,China;School of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《能源与环保》
2023年第8期277-283,共7页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家自然科学基金资助项目(51374091,51674101)
河南省重点研发与推广专项(科技攻关)资助项目(232102321132)。
关键词
回采巷道
滑动构造
三软煤层
力学机制
差异支护
稳定性
entry
sliding structure
"Three-Soft"coal seam
mechanical mechanism
differential supporting
stability
