Failure Mechanism And Supporting Strategy Of Deep Rock Roadway Under High Ground Stress

The haulage roadway of the fifth coal mine of Hebi coal group located in the syncline axis, depth of burial 706 m, is suffering from a knotty problem of severe tunnel deformation and in short supply of production due to high tectonic stress and complex geological environment. The main elements on roadway stability controlling were determined and the mechanism of the deformation and failure of the roadway was researched by means of comprehensive analysis on engineering geological and the results of in situ measurement of ground stress around the roadway, based on the result of numerical simulation, the new coupling supporting design-bolt-mesh-cable + truss with anchor in the floor to control floor heaving-is proposed. Practices have proved that the bolt-mesh-cable + truss and anchor in the floor scheme adapts to high ground press condition, it will make full use of the action of coupling support and controlling the deformation of the roadway sufficiently, and providing fundamental basis for safe and efficient production for other coal mines.