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.