基于力学模型构建的留巷切顶高度确定与围岩控制技术  

Roof cutting height determination and surrounding rock control technology ofgob-side entry retaining based on mechanical modelling

作　　者：辛亚军[1,2] 吴春浩 杨俊鹏 田孟含 祝忍忍 XIN Yajun;WU Chunhao;YANG Junpeng;TIAN Menghan;ZHU Renren(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)

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]煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454000

出　　处：《煤炭工程》2024年第1期119-126,共8页Coal Engineering

基　　金：国家自然科学基金项目(51374091,51174078);河南省重点研发与推广专项(科技攻关)(232102321132,232102320253)。

摘　　要：以顺和煤矿2401运输巷道沿空留巷为工程背景,分析巷道围岩结构特征,基于巷道局部空间结构稳定性,分别构建了沿空留巷未切顶与切顶力学结构模型,并以巷道不同切顶高度进行物理相似模拟试验。结果表明:巷旁采空区切落的矸石增加对关键块的支撑力,同时弱化关键块对直接顶悬壁端部挤压,巷旁支护阻力减少35.78%;随着切顶高度增加,巷道顶板采空区侧端部悬臂由F型缓慢过渡到大I型,同时大保护结构具有向上平移趋势,相比于未切顶1巷,4 cm切顶2巷、8 cm切顶3巷与16 cm切顶4巷叠加应力峰值分别下降9.38%,28.13%,25.00%。结合巷道顶板岩性,最终确定切顶高度为8.2 m,留巷段采用三列单体液压支柱作巷旁支护,长短锚索超前补强,巷道围岩稳定,较好满足使用要求。Taking the gob-side entry retaining of 2401 transport roadway in Shunhe Coal Mine as the engineering background,the structural characteristics of roadway surrounding rock are analyzed.Based on the stability of local spatial structure of roadway,the mechanical structure models of non-roof cutting and roof cutting of gob-side entry retaining are constructed,and the physical similarity simulation test is carried out with different roof cutting heights of roadway.The results show that,the gangue cut off in the goaf increases the support force to the key block,weakens the extrusion of the key block to the end of the immediate roof hanging wall,and reduces the support resistance by 35.78%.With the increase of roof cutting height,the cantilever on the goaf side end of roadway roof slowly transits from F type to I type,and the large protection structure has the trend of upward translation.Compared with the non-roof cutting 1 roadway,the superimposed stress peaks of 4 cm roof cutting 2 roadway,8 cm roof cutting 3 roadway and 16 cm roof cutting 4 roadway decrease by 9.38%,28.13%and 25.00%,respectively.Combining with the roof lithology of the roadway,the roof cutting height is finally determined to be 8.2 m,and the retaining section adopts three columns of single hydraulic props as roadside support.The long and short anchor cables are reinforced in advance,and the surrounding rock of the roadway is stable,which can better meet the requirements.

关 键 词：沿空留巷 顶板结构 切顶卸压 巷旁支护 

分 类 号：TD353[矿业工程—矿井建设]