A Coal Mine In Shanxi, Anchor Cable Anchor Supporting High Stress Soft Rock Tunnel Excavation Technology Research

In recent years, with the increasing of the mining scale and the deepening of the mining depth, the ground stress is becoming much and much bigger, the surrounding rocks of mines are showing the same characteristic as soft rock, and the difficulty tunnel supporting problems is becoming particularly outstanding. Studies on deep mining technologies are of great significance for our country in the further deep coal resources developing. A series of serious problems are risen because of the deepening of mining depth, such as the tunnel confining pressure, the deformation of the surrounding rocks and the frequency of overhauling significantly increase, the support things suffered so seriously damaged that the maintenance becomes very difficult. Effective supporting can directly affect the safety and the production efficiency, so the control on the pressure of deep wells maybe one of the key problems needed to be solved eagerly for deep mining. In recent years, the bolt supporting technology in coal mine roadway is mature gradually, and popularized and used widely. But in the practical engineering, the surrounding rock still exists some problems, such as large deformation, the broken of bolt anchor pulled. even causing engineering accidents. Whether or not dealing with the problems of the difficult supporting on soft rock tunnel the effect the deep roadway is are solved high relates to the deep development on the coal mine industry and production safetyThe paper used one coal mine roadway in Shanxi as a project example. It developed a roadway excavation model and a support model through the numerical simulation software FLAC3D, and then analyzed the change of the displacement and stress on x and z direction after developing the roadway. Through simulating the roadway excavation under the three different ways, separately analyzed the results of the three kinds of supporting methods at the aspects of the surrounding rock stress and displacement distribution characteristics. and then found a good supporting method. Compared with the measured data. it showed that the combination support of bolt anchor cable under the high stress in soft rock tunnels play very good role and greatly reduces the cost of repair and support on the deep soft rock tunnel after mining.