沿空掘巷合理煤柱宽度及支护技术研究
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摘要
沿空掘巷中,窄煤柱对其所处巷道围岩附近的稳定至关重要,可使沿空掘巷在应力降低区进行掘进。以新景矿为工程背景,采用FLAC~(3D)建立数值计算模型,提出了7种不同煤柱宽度,对沿空掘巷围岩集中应力和塑性区分布规律以及巷道变形进行了对比分析,确定了留设煤柱宽度为8 m。现场实践表明:巷道掘进采用该煤柱宽度之后,取得良好的施工效果,验证了参数设计的合理性。
In the roadway driving along goaf, the narrow pillar is very important for the stability of the surrounding rock of the roadway where it is located, and it can be used to excavate roadway along goaf in the stress-reducing zone.Based on the Xinjing coal mine as the engineering background, used FLAC~(3D)to establish a numerical calculation model, and seven different coal pillar widths are proposed.The concentration of stress and plastic zone distribution law of roadway surrounding laneway and roadway deformation are compared and analyzed. The width of the remaining coal pillar is 8 m. The field practice shows that the excavation used for the width of the coal pillar has achieved good results,which verifies the rationality of the parameter design.
In the roadway driving along goaf, the narrow pillar is very important for the stability of the surrounding rock of the roadway where it is located, and it can be used to excavate roadway along goaf in the stress-reducing zone.Based on the Xinjing coal mine as the engineering background, used FLAC~(3D)to establish a numerical calculation model, and seven different coal pillar widths are proposed.The concentration of stress and plastic zone distribution law of roadway surrounding laneway and roadway deformation are compared and analyzed. The width of the remaining coal pillar is 8 m. The field practice shows that the excavation used for the width of the coal pillar has achieved good results,which verifies the rationality of the parameter design.
引文
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[8]康红普,牛多龙,张镇,等.深部沿空留巷围岩变形特征与支护技术[J].岩石力学与工程学报,2010,29(10):1 977-1 987.
[2]张蓓,付志鹏.沿空掘巷合理煤柱宽度研究[J].煤炭技术,2017,36(1):66-68.
[3]潘继良,高召宁,郑志伟..缓倾斜煤层沿空掘巷窄煤柱合理宽度研究[J].煤炭技术,2016,35(7):43-45.
[4]郭正宝.沿空动压巷道围岩稳定性与支护技术研究[D].青岛:山东科技大学,2011.
[5]陈龙.留小煤柱沿空掘巷支护技术研究[D].邯郸:河北工程大学,2010.
[6]王琳,李树刚,王红胜,等.沿空掘巷窄煤柱合理宽度确定[J].煤炭技术,2013,32(3):86-88.
[7]郑西贵,姚志刚,张农.掘采全过程沿空掘巷小煤柱应力分布研究[J].采矿与安全工程学报,2012,29(4):459-465.
[8]康红普,牛多龙,张镇,等.深部沿空留巷围岩变形特征与支护技术[J].岩石力学与工程学报,2010,29(10):1 977-1 987.