Study on the Supporting and Repairing Technologies for Difficult Roadways with Large Deformation in Coal Mines

AbstractIt is essential to research into the supporting and repairing technologies for ensuring the difficult roadways safety. Based on the widely field investigation including the surrounding environments and supporting technologies of the rock and coal roadways with large deformation, such as in Tangkou, Liuzhuang, Huajiahu, Xinzhi coal mine, etc, the preliminary combining supporting styles and the corresponding effect for the rock roadways are analyzed and concluded. The corresponding supporting technologies for the difficult roadways, such as the roadways with large cross section, soft surrounding rock, intensively dynamic pressure, compound roof, high ground stress, water seepage in the roof or two sides and the influence of the roadways nearby, are studied theoretically and also concluded. Finally, some subsidiary contents are brought forward to control the roadway deformation, which include concrete parameters, the quality of supporting materials, the building of monitoring system