Research On Geological Dynamic Condition And Its Control On Coal And Gas Outburst In Pingdingshan 8^th Mine

Coal and gas outburst is a kind of complex dynamic phenomenon, and serious threat to mine production safety. Research shows that geological dynamic conditions such as plate motion, geological structures, tectonic valley, stress control coal and gas outburst.After the research on the plate motion, topography, regional tectonic, find out the space and time state of geological structure and tectonic block of Pingdingshan mine area.Ⅰ~Ⅴlevel active faults are determined by method of geological dynamic regionalization, what's more, construct tectonic activity grillage, and study on ascertained active faults using fractal theory. Results show that nappe belt in the south of North China coal-accumulating district thrust the mining area, causing tectonic stress concentration and increasing the elastic energy of coal and rock in the mining area; Active faults thrust cause pressure in faults face, and generate tectonic stress concentration; The inclined angle between fracture azimuth and the maximum principal stress direction, the activity of fracture and other factors control coal and gas outburst.Numerical simulation method is used to simulate the influence of coal seam roof lithologic combination on outburst, show that sandy roof influences underlie coal seam outburst by the huge elastic energy resilience gathered in thick sandy roof, which provides motive power, not the self-gravity. Through the rock stress state calculation and analysis, learn that the influence of fault on the outburst shows in stress increased region and stress grads region generating in coal seam roof. Through energy calculation, know the elastic proficiency of Wu9-10 coal seam roof, the maximum is 0.025 MJ/m~3, gathered elastic potential supports enough energy for coal and gas outburst. By contrasting the elastic potential distribution and outburst spot, make sure elastic potential value in outburst region is over 0.015 MJ/m~3.