关键词: 软弱煤层, 煤巷, 拉应力, 变形特征

Abstract:

The soft and weak coal roadway support in thick coal seam roof has been one of the key problems to realizing the safety and high efficiency production in large coal mines with complex supporting conditions in China. The soft and weak coal seam roof in roadways suffers from the large tensile stress and could lead to sudden roof collapse because of lots of thin rock layers inserting the extra thick coal seam leading to the roof abscission, and the roadway excavation in the soft and weak coal seam is easily deformed. Firstly, the deformation characteristics are analyzed, and then a set of combining support system including high pre-stress bolt, single cable and truss cable is put forward. Taking a typical soft and weak coal roadway in Shanxi Province, the production and geological characteristics are introduced, and the set of supporting system is applied to the roadway to have a supporting trial. The results show that the roof controlling effect is perfect and have a preferred value to the supporting design to the analogous coal roadways.