Research quantitative model of gas pressure gradient and in-situ stress in complex tectonic outburst coal seam

The main factors of affecting coal and gas outburst are gas pressure change rule and in-situ stress distribution regularities in complex tectonic outburst coal seam; Based on the relationship of between Darcy's etc, a quantitative calculation model of gas pressure gradient and in-situ stress is established; Simulating the damage rule in Li Wang-miao coal mine 1152 cross-hole region. The results are stress gradient change obviously and coal first destruction and serious damage in the wing region near stress neutral plane along 15, 20 and 28 m of X direction. Combining the model calculated gas stress gradient distribution regularities in of the region. The results show that gas pressure gradient will change obviously when in-situ stress is 3 MPa, increase sharply when in-situ stress is more than 3 MPa and along X direction 0 similar to 5 m and 28 similar to 31 m of the calculation model in tectonic coal seam.