软弱岩层巷道二次支护新思路

New Thinking of Secondary Support for Soft Rock Roadway

针对软弱岩层巷道围岩压力大、稳定性差、巷道变形严重等问题,以榆树沟煤矿软弱岩层巷道为背景,进行了围岩变形规律监测。提出了初次支护采用长锚杆,二次支护采用全断面工字钢支架的二次支护新思路。理论分析了初次支护为让压柔性支护,二次支护为刚性较大的支护,且探讨了二次支护的合理形式及时机。

According to the problem of the great surrounding rock pressure,bad stability and large deformation in soft rock roadway, based on the soft rock roadway in Yushugou mine, the law of surrounding rock deformation were monitored ,the new thinking of secondary support was presented. The long bolt was adopted in the primary support, and the fully-section I- beam was adopted in the secondary support. The primary support was yield pressure and flexible support by theoretical analysis. The secondary support was rigid supporting, besides the reasonable secondary support opportunity and form was discussed.