Abstract: The related theory and model tests of coal and gas outbursts in the face of hard coal roadway tunneling in the deep coal seam were studied to explore the coal and gas outburst mechanism of hard coal. Based on fracture mechanics, rock mechanics and theory of coal and gas outburst, a hypothesis of thin plate theory of coal roadway tunneling in the deep coal seam was proposed, and used to the model tests. The analysis results of thin plate theory of coal roadway tunneling in the deep coal seam show the size of working face, elastic modulus, the coefficient of lateral pressure and gas pressure have a great influence on coal and gas outbursts in the face of hard coal roadway tunneling in the deep coal seam. The results of model tests show that under the condition of large stress of surrounding rock and the consistence coefficient of coal, the critical conditions of coal and gas outbursts in the face of hard coal roadway tunneling in the deep coal seam are affected mainly by the surrounding rock stress, the elastic modulus, the coefficient of lateral pressure and the size of working face, and less affected by gas pressure. Under the condition of the large stress of surrounding rock, the large consistence coefficient of coal, the constant elastic modulus and the constant coefficient of lateral pressure, the critical axial stress of the model tests decreases approximate linearly with the increases of the working face size. The results of the model tests basically conform to the thin plate theory of coal roadway tunneling in the deep coal seam, which verify the hypothesis of thin plate theory of coal roadway tunneling in the deep coal seam.

Key words: coal and gas outburst, coal roadway tunneling face, thin plate theory of hard coal, simulation experiment