近距离采空区下综放工作面窄煤柱尺寸优化设计
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摘要
基于701工作面地质条件和开采条件,采用理论分析和数值模拟等方法,对近距离煤层采空区下综放工作面窄煤柱的尺寸进行优化。根据内应力场和极限平衡区相关理论,确定窄煤柱的尺寸的下限和上限分别为4m和7m。对掘巷后和采动条件两种工况下巷道围岩位移和应力分布情况进行分析,结果表明,随着窄煤柱宽度的加大,围岩变形量呈先减小后增大的趋势;当窄煤柱宽度为6m时,巷道变形量最小,确定窄煤柱最优留设宽度为6m。研究成果为其他类似条件工作面的煤柱留设提供参考。
Based on the geological conditions and mining conditions of 701 working face in a coal mine in Inner Mongolia,the size of narrow coal pillar in fully mechanized top coal caving face under goaf was optimized by theoretical analysis and numerical simulation. According to the theory of internal stress field and limit equilibrium area,the lower and upper limits of the size of narrow coal pillar were 4 m and 7 m. The stress and displacement distribution law of roadway surrounding rock under different coal pillar dimensions was numerically analyzed. With the increase of coal pillar size,the deformation of surrounding rock decreased first and then increased. When the width of pillar was 6 m,the deformation was the smallest. Therefore,the optimal width of narrow pillar was 6 m. The research results can provide references for other coal pillars with similar conditions.
Based on the geological conditions and mining conditions of 701 working face in a coal mine in Inner Mongolia,the size of narrow coal pillar in fully mechanized top coal caving face under goaf was optimized by theoretical analysis and numerical simulation. According to the theory of internal stress field and limit equilibrium area,the lower and upper limits of the size of narrow coal pillar were 4 m and 7 m. The stress and displacement distribution law of roadway surrounding rock under different coal pillar dimensions was numerically analyzed. With the increase of coal pillar size,the deformation of surrounding rock decreased first and then increased. When the width of pillar was 6 m,the deformation was the smallest. Therefore,the optimal width of narrow pillar was 6 m. The research results can provide references for other coal pillars with similar conditions.
引文
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[15]姜耀东,宋红华,马振乾,等.基于地应力反演的构造应力区沿空巷道窄煤柱宽度优化研究[J].煤炭学报,2018,43(2):319-326.
[2]柏建彪.沿空掘巷围岩控制[M].徐州:中国矿业大学出版社,2006.
[3]李学华,鞠明和,贾尚昆,等.沿空掘巷窄煤柱稳定性影响因素及工程应用研究[J].采矿与安全工程学报,2016,33(5):761-769.
[4]郝金鹏,孟巧荣.综放采场留窄煤柱沿空掘巷及支护技术研究[J].矿业研究与开发,2015,35(11):64-68.
[5]殷帅峰,何富连,程根银,等.基于煤体微裂隙演化进程的综放窄煤柱煤巷非对称支护研究[J].采矿与安全工程学报,2016,33(3):444-451.
[6]祁方坤,周跃进,曹正正,等.综放沿空掘巷护巷窄煤柱留设宽度优化设计研究[J].采矿与安全工程学报,2016,33(3):475-480.
[7]张洪伟,万志军,张源,等.非充分稳定覆岩下综放沿空掘巷窄煤柱变形机理[J].采矿与安全工程学报,2016,33(4):692-698.
[8]查文华,李雪,华心祝,等.基本顶断裂位置对窄煤柱护巷的影响及应用[J].煤炭学报,2014,39(S2):332-338.
[9]张炜,张东升,陈建本,等.孤岛工作面窄煤柱沿空掘巷围岩变形控制[J].中国矿业大学学报,2014,43(1):36-42.
[10]王红胜,张东升,李树刚,等.基于基本顶关键岩块B断裂线位置的窄煤柱合理宽度的确定[J].采矿与安全工程学报,2014,31(1):10-16.
[11]杨科,谢广祥.窄煤柱综放巷道围岩应力场特征[J].采矿与安全工程学报,2007,24(3):311-315.
[12]何富连,高峰,孙运江,等.窄煤柱综放煤巷钢梁桁架非对称支护机理及应用[J].煤炭学报,2015,40(10):2296-2302.
[13]张广超,何富连.大断面综放沿空巷道煤柱合理宽度与围岩控制[J].岩土力学,2016,37(6):1721-1728.
[14]彭林军,张东峰,郭志飚,等.特厚煤层小煤柱沿空掘巷数值分析及应用[J].岩土力学,2013,34(12):3609-3616.
[15]姜耀东,宋红华,马振乾,等.基于地应力反演的构造应力区沿空巷道窄煤柱宽度优化研究[J].煤炭学报,2018,43(2):319-326.