关键词: 深部软岩巷道, 底臌, 数值模拟, 方案比较

Abstract: With the increasing of mining depth, the roof-floor lithology of the tunnel shows the characteristics as soft rock, normally resulting in the drift floor-heave.The rational bolt supporting mode should be selected based on the specific conditions to regulate the roof and floor.And the principle is that it can meet all requirements of transportation, ventilation and safety on the basis of saving costs.An optimum scheme is chosen after comparing the result of FLAC simulation.Taking Xinqiao Coal Mine -550 m north flank orbit drift as a case, this paper analyzed the drift floor-heave formation mechanism and proposed several repairing methods.Then, with the simulation of FLAC software, the optimal scheme which can supply the safety in production with the best cost-saving in economic is obtained.The rock burst monitoring verified that the supporting effect is good, and this method and the supporting technique afford the precious experience for managing drift floor-heave in mining areas.