不同夹矸位置的沿空巷道围岩变形规律及支护
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摘要
为研究夹矸位置对沿空留巷巷道稳定性的影响,采用数值模拟和现场实测的方法分析不同夹矸位置条件下的巷道垂直应力、塑性区分布、位移矢量及变化规律,提出了围岩联合控制技术和参数。研究发现,夹矸在巷道下部时,围岩稳定性最好,夹矸越靠近顶板,越容易受顶煤运动的影响,从而加剧煤柱的变形,减弱巷道围岩稳定性;提出的锚网索联合支护方式对围岩适应性较好。
In order to study the influence of gangue position on the stability of gob-side retaining entry,the numerical simulation and field measurement were used to analyze the vertical stress,plastic zone distribution,and displacement vector and variation at different gangue positions.Accordingly,ajoint control technology and parameters for surrounding rock were proposed.The study found that the surrounding rock was the most stable when the gangue was at the lower part of the roadway.The closer the gangue was to the roof,the more susceptible it was to the influence of the top coal movement,thereby aggravating the deformation of the coal pillars and weakening the stability of the surrounding rock.The proposed anchor-net-cable joint support scheme was better adapted to the surrounding rock.
In order to study the influence of gangue position on the stability of gob-side retaining entry,the numerical simulation and field measurement were used to analyze the vertical stress,plastic zone distribution,and displacement vector and variation at different gangue positions.Accordingly,ajoint control technology and parameters for surrounding rock were proposed.The study found that the surrounding rock was the most stable when the gangue was at the lower part of the roadway.The closer the gangue was to the roof,the more susceptible it was to the influence of the top coal movement,thereby aggravating the deformation of the coal pillars and weakening the stability of the surrounding rock.The proposed anchor-net-cable joint support scheme was better adapted to the surrounding rock.
引文
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[2]王建超,姜福兴,朱斯陶,等.夹矸厚煤层掘进工作面冲击地压机理及防治技术[J].煤矿安全,2016,47(1):88-91.WANG Jianchao,JIANG Fuxing,ZHU Sitao,et al.Mechanism and Prevention Technology of Rock Burst Occurred in Driving Face of Thick Coal Seam with Rock Parting[J].Safety in Coal Mines,2016,47(1):88-91.
[3]王自龙,张成良.基于FLAC3D的煤层夹矸对巷道稳定性影响分析[J].煤矿机械,2017,38(6):181-183.WANG Zilong,ZHANG Chengliang.Analysis of Influence of Coal Gangue on Roadway Stability Based on FLAC3D[J].Coal Mine Machinery,2017,38(6):181-183.
[4]王建利,沈乐,徐营.浅埋薄基岩含夹矸煤层巷道围岩稳定及控制技术[J].煤炭技术,2016,35(8):8-10.WANG Jianli,SHEN Le,XU Ying.Research on Stability and Supporting Technology of Surrounding Rock of Roadway in Shallow Coal Seam with Thin Bedrock Containing Parting[J].Coal Technology,2016,35(8):8-10.