屯兰煤矿厚煤层沿空留巷充填体上方顶板稳定性控制研究  

Study on roof control above backfilling area for gob-side entry retaining in 22301 workface of Tunlan Coal Mine

作　　者：曹俊文 CAO Junwen(Tunlan Coal Mine,Shanxi Coking Coal Group Co.,Ltd.,Taiyuan 030052,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]山西焦煤集团有限责任公司屯兰煤矿,山西太原030052 [2]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤矿安全》2021年第12期229-234,共6页Safety in Coal Mines

摘　　要：充填体上方顶板的稳定性是影响沿空留巷效果的关键因素,针对屯兰矿22301大采高工作面留巷顶板离层的控制难题,通过分析留巷期间各阶段顶板受力特征和顶板离层机理,建立充填体上方顶板离层力学模型,提出了厚煤层沿空留巷充填体上方直接顶板的分区动态加固控制技术:"锚网索"+"高预应力锚网索"+"高阻力液压支柱"留巷分阶段支护。现场试验结果表明:顶板最大下沉量为140 mm,底鼓量为660 mm;工作面后方150 m外,0~6 m累计离层量为16 mm、0~2.5 m累计离层量为14 mm;围岩变形以底鼓为主,采用分区域动态支护加固顶板控制技术使顶板整体稳定性得到明显提升。The stability of the roof above the filling body is a key factor affecting the effect of gob-side entry retaining.In view of the problem of roof separation control of gob-side entry retaining at 22301 working face with large mining height in Tunlan Coal Mine,by analyzing the stress characteristics and roof separation mechanism of each stage during the roadway retaining,the mechanical model of roof separation above the filling body was established,the partition dynamic reinforcement control technology of the straight roof above the gob-side entry retaining filling body in thick coal seam was proposed,that is“anchor cable”+“high pre-stressed anchor cable”+“high resistance hydraulic prop”stage support for the entry retaining.The field test results show that the maximum subsidence of the roof is 140 mm,and the floor heave is 660 mm.Outside the 150 m behind the working face,the cumulative separation of 0 m to 6 m is 16 mm,and the cumulative separation of 0 m to 2.5 m is 14 mm.The surrounding rock deformation is dominated by floor heave.The overall stability of the roof supported by sub-regional dynamic support reinforcement technology is significantly improved.

关 键 词：厚煤层 沿空留巷 顶板离层 顶板控制 大采高 力学模型 

分 类 号：TD327[矿业工程—矿井建设]