“疏水”沿空留巷技术在三软厚煤层中的应用

Application of Hydrophobic Gob-side Entry Retaining Technology in Three-soft Thick Coal Seam

芦沟煤矿32101工作面受底板L7-8及L1-4灰岩水影响,属于典型的带压开采工作面,回采期间需对下副巷实施完全沿空留巷疏排底板水。32101下副巷采用U型钢支护,沿空留巷时每间隔两棚补打一根伸缩梁配2.4 m坑木,并补打锚网索进行加强支护,能有效控制顶板的下沉变形,保持巷道稳定。

32101 working face in Lugou Colliery belongs to typical working face mined under water pressure due to the limestone water in floor L7-8 and L1-4.The author proposes the implementation of complete floor water drainage with gob-side entry retaining in the lower lane by piling expansion beam with 2.4-meter mine timber every two sheds with U-shaped steel support and reinforcing the support with supplementary bolt-mesh-cable,which can control the roof settlement deformation effectively and maintain the roadway stability.