为了实现富水软岩大断面交岔点巷道的稳定控制,分析了榆树井煤矿富水软岩大断面交岔点巷道掘进失稳的形成及原因,制定了更为经济有效的支护结构和合理的支护参数,采用了关键部位补强支护+全断面锚注+U29型钢支架拱部、肩部使用固棚锚索支护+底板砌筑钢筋混凝土反底拱等复合型全封闭支护手段实现巷道稳定。实践结果表明:此类复合型支护手段可以有效控制富水软岩大断面交岔点巷道的稳定,通过观测,巷道在修复45 d以后已经呈现稳定趋势,巷道收敛变形速率为0.012 mm/d。

In order to have the stable control of the mine large cross section crossing roadway in watery soft rock, the paper had a study on a formation and cause of the stability lost in the large cross section crossing roadway heading in watery soft rock of Yushujing Mine.More economic and efficient support structures and rational support parameters were set up.In order to keep the stability of the mine roadway, the complex full closed support means, including the key location reinforced support + full cross section bolts and grouting + U29 type steel support at the arch location, fixed shield and anchor support at the shoulder location + floor lined with reinforced concrete reverse floor arch and others were applied.The practice results showed that the complex support means could effectively control the stability of the mine large cross section crossing roadway in watery soft rock. After 45 days of the roadway repaired, the observation showed that the mine roadway was stable in tendency and th e convergence and deformation rate of the roadway was 0.012 mm/d.