Study on geomechanical evaluation of No. 9+10+11 coal seam in Black Dragon Coal Industry

In order to provide a reliable basis for the support design and optimization of coal seam development and mining roadway No. 9+10+11 of Black Lung Coal Industry, and ensure the stability of the surrounding rock of the roadway, through the physical and mechanical property test of coal seam and roof and floor rock strata, geological radar field test, drilling and peeping and other technical means, the evolution law of surrounding rock loose circle of different roadway is studied, combined with the in-situ stress test results of adjacent mining areas. The results of comprehensive evaluation of the geomechanical conditions of the surrounding rock of the roadway in Heilong Coal industry show that the surrounding rock of the roadway belongs to the class IV～V, which is generally unstable ～ unstable, mostly the roadway with medium ～ large loose circle, and the coal roadway can be supported by bolt.