崔家沟煤矿巷道围岩变形规律研究

Research on deformation law of roadway surrounding rock in Cuijiagou Coal Mine

  • 摘要: 以崔家沟煤矿2209工作面回风巷为工程背景,采用“十字布点法”和顶板离层仪对巷道表面和顶板深部围岩变形进行了为期30 d的现场监测。结果表明:顶底板累计移近量为142~222 mm,两帮累计移近量为140~294 mm,累计底鼓量为54~94 mm,顶板累计离层量为44~77 mm,巷道顶底板和两帮移近量、底鼓量、离层量呈递增趋势;在顶板和两帮变形大的地方底鼓较明显,深基点和浅基点范围内均发生离层;在监测前期,巷道顶底板和两帮变形处于缓慢收敛阶段,在监测后期,巷道顶底板和两帮变形处于加速收敛阶段,说明巷道已进入二次变形阶段。

     

    Abstract: Taking return airway of No.2209 working face of Cuijiagou Coal Mine as engineering background, deformation of roadway surface and deep surrounding rock of roof were monitored for 30 d by use of cross distribution point method and roof separation indicator. The results show that cumulative convergence between roof and floor is 142—222 mm, cumulative convergence between two side walls is 140—294 mm, cumulative floor heave value is 54—94 mm, and cumulative roof separation value is 44—77 mm. The convergence between roof and floor, convergence between two side walls, floor heave value and roof separation value are increasing; floor heave is more obvious in which deformation of roof and two side walls are large. Roof separation occurs in range of deep and shallow basis points. In the early stage of monitoring, deformation of roof and floor and two side walls is in slow convergence phase. In the late stage of monitoring, deformation of roof and floor and two side walls is in accelerated convergence phase, which indicate that roadway has entered the secondary deformation stage.

     

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