庞庞塔矿留窄煤柱沿空煤巷不对称支护技术应用研究
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摘要
为解决霍州煤电集团庞庞塔矿9-301工作面回风巷成巷后,在相邻工作面采动影响下围岩变形严重的问题,通过现场观测发现原有支护系统存在煤柱侧巷帮及靠近煤柱侧顶板支护强度不足的问题,根据生产经验设计采用"锚索+槽钢+钢筋组合圈梁"非对称支护体系,通过数值模拟确定锚梁桁架支护方案参数:偏心距为450 mm,跨距为1.4 m。应用后现场观测结果表明,靠近切眼处巷道围岩在采动影响下位移量稍大一些,至工作面回采至测点位置,顶底板移近量最大约为160 mm,两帮移近量最大约为100 mm,巷道围岩整体上稳定性良好,变形量较小,能够满足工作面生产的要求,取得了很好的支护效果。
In order to solve the problem of the serious surrounding rock deformation under the influence of mining under the adjacent working face after the 9-301 working face air return roadway completion of the Pang Pangta Mine of Huozhou Coal and Electricity Group, the problem of insufficient strength of the side pillars of the coal pillar and the support of the roof near the coal pillar in original support system was discovered through field observation. According to the production experience, the asymmetric support system of "anchor + channel + steel combined ring beam"was designed, and the anchor beam truss branch was determined by numerical simulation. Protection program parameters, eccentricity was 450 mm and span was 1.4 m. The field observation results showed that the displacement of the surrounding rock of the roadway near the incision was slightly larger under the influence of mining. The maximum amount of the top and bottom plates was about 160 mm, the maximum of the two sides was about 100 mm, the stability of the surrounding rock of the roadway was good, with small deformation, which can meet the requirements of the production of the working face and achieve a good support effect.
In order to solve the problem of the serious surrounding rock deformation under the influence of mining under the adjacent working face after the 9-301 working face air return roadway completion of the Pang Pangta Mine of Huozhou Coal and Electricity Group, the problem of insufficient strength of the side pillars of the coal pillar and the support of the roof near the coal pillar in original support system was discovered through field observation. According to the production experience, the asymmetric support system of "anchor + channel + steel combined ring beam"was designed, and the anchor beam truss branch was determined by numerical simulation. Protection program parameters, eccentricity was 450 mm and span was 1.4 m. The field observation results showed that the displacement of the surrounding rock of the roadway near the incision was slightly larger under the influence of mining. The maximum amount of the top and bottom plates was about 160 mm, the maximum of the two sides was about 100 mm, the stability of the surrounding rock of the roadway was good, with small deformation, which can meet the requirements of the production of the working face and achieve a good support effect.
引文
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