Abstract: To investigate the controlling effect of ground stress on gas pressure and outburst disaster, based on theoretical analysis and field verification, the evolution law of ground stress and its controlling effect on the coal structure, gas pressure and outburst disasters was analyzed in this paper. The results show that the evolution of tectonic stress plays a dominant role in the gas occurrence and migration. The coal seam gas pressure gradient under the higher tectonic stress may be greater than that under the hydrostatic pressure, which will lead to high gas pressure. In addition, the tectonic coal formed under the strong tectonic activity is charactered mainly by low strength, strong adsorption and diffusion. Moreover, due to the controlling effect on the coal structure and gas pressure, it is considered that the ground stress plays a leading controlling role in the outburst accident, which is the main driving force on coal mass destroy, and the premise condition for the existing of high-pressure gas. Finally, the leading controlling role of tectonic stress on outburst disaster have been verified by the characteristics of coal and gas outburst disasters in No.72 Coal Seam of Qinan Coal Mine.

Key words: ground stress, tectonic stress, coal structure, gas pressure, coal and gas outburst