孤岛煤柱回采技术参数对下伏大巷围岩稳定性影响研究
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摘要
针对孤岛煤柱回采技术参数对下伏大巷围岩塑性区破坏范围的影响展开研究。首先对孤岛煤柱回采技术参数,包括煤柱留设尺寸、开采厚度、推进速度以及超前卸压回采对下伏大巷围岩稳定性进行计算分析,得到保证大巷稳定性的最优技术参数,即:留设3m护巷煤柱、整层开采、日进尺3m以及回采时采用超前卸压措施。并根据最优回采技术参数条件下大巷围岩塑性破坏呈现出的"X"型这一现象,确定大巷的重点支护区域,提出新的支护方案与参数。最后,对孤岛煤柱采动影响下的大巷支护效果进行计算分析。结论表明,与原始状态相比,孤岛煤柱采后的大巷围岩变形较小,利于维护。
A series of study was carried out about the influence of island coal pillar mining technical parameters on the failure range of surrounding plastic zone of underlying main roadway. Firstly,the technical parameters of the island coal pillar mining,including the coal pillar retaining size,mining thickness,advancing speed and advance stress-relief mining,are selected to calculate and analyze the surrounding rock stability of the underlying roadway,and the optimal technical parameters for ensuring the stability of the roadway are obtained,these are: 3 m gateroad coal pillars,full-seam mining,3 m daily advance and advance stress-relief mining. Then,according to the phenomenon of "X"in the plastic failure of surrounding rock under the condition of optimal recovery technology,the key supporting area of the main roadway,the new supporting scheme and parameters are determined. Finally,the support effect of the roadway under the influence of the mining of the isolated coal pillar is calculated and analyzed. The conclusion shows that the deformation of the surrounding rock of the main coal pillar is less than that of the original state,which is beneficial to support.
A series of study was carried out about the influence of island coal pillar mining technical parameters on the failure range of surrounding plastic zone of underlying main roadway. Firstly,the technical parameters of the island coal pillar mining,including the coal pillar retaining size,mining thickness,advancing speed and advance stress-relief mining,are selected to calculate and analyze the surrounding rock stability of the underlying roadway,and the optimal technical parameters for ensuring the stability of the roadway are obtained,these are: 3 m gateroad coal pillars,full-seam mining,3 m daily advance and advance stress-relief mining. Then,according to the phenomenon of "X"in the plastic failure of surrounding rock under the condition of optimal recovery technology,the key supporting area of the main roadway,the new supporting scheme and parameters are determined. Finally,the support effect of the roadway under the influence of the mining of the isolated coal pillar is calculated and analyzed. The conclusion shows that the deformation of the surrounding rock of the main coal pillar is less than that of the original state,which is beneficial to support.
引文
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[5]黄炳香,刘长友,郑百生,等.超长孤岛综放工作面煤柱支承压力分布特征研究[J].岩土工程学报,2007,29(6):932-937.
[6]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):36-43.
[7]赵鹏,马占国,张帆,等.孤岛面小煤柱沿空巷道稳定性研究[J].采矿与安全工程学报, 2006, 23(3):354-357.
[8]李佃平,窦林名,牟宗龙,等.孤岛型边角煤柱工作面反弧形覆岩结构诱冲机理及其控制[J].煤炭学报,2012,37(5):719-724.
[9]李振雷,窦林名,王桂峰,等.坚硬顶板孤岛煤柱工作面冲击特征及机制分析[J].采矿与安全工程学报,2014,31(4):519-524.
[10]姜福兴,成功,冯宇,等.两侧不规则采空区孤岛工作面煤体整体冲击失稳研究[J].岩石力学与工程学报,2015,34(S2):4164-4170.
[11]张华磊.采场底板应力传播规律及其对底板巷道稳定性影响研究[D].徐州:中国矿业大学,2011.
[12]刘长友,刘奎,郭永峰,等.超长“孤岛”综放面大煤柱护巷的数值模拟[J].中国矿业大学学报,2006,35(4):473-477.
[13]宋艳芳,唐治,潘一山,等.孤岛工作面应力分布规律的数值分析[J].中国地质灾害与防治学报,2012(4):65-68.
[14]王宏伟,姜耀东,高仁杰,等.长壁孤岛工作面冲击失稳能量场演化规律[J].岩土力学,2013(S1):479-485.
[15]王朋飞,赵景礼,王志强,等.非充分采动采空区与煤岩柱(体)耦合作用机制及应用[J].岩石力学与工程学报,2017,36(5):1185-1200.