Experimental Research on Coal and Gas Delay Outburst and AE Characteristics under Conditions of Geostress and Gas Pressure Disturbance

Adopting yellow mud as barrier layer materials, coal and gas delay outburst experiments under conditions of geostress accumulation disturbance were carried out by using self-developed simulation system, to find roles pressure played in the process ways predict it, through analysis variations pressure, AE characteristics during process. The results show that after increased 0.11 MPa from 1.80 MPa, an occurs, while situations, increase 0.27 0.67 induces outburst; hence, is one dominant factors impacting occurrence. lasting time triggering shorter than disturbance, duration development longer conditions. Coal seam breakage precondition for risk, expansion energy parameter influencing development. signals distinctive features different stages disturbance. At preparation stage outburst, sharply but have a low intensity then drop lower balance level. stage, become active increasing until up peak where highest.