Mine Strata Pressure Behavior Law and Support Technology of Mine Dynamic Gateway

Based on the stress monitoring and measuring of coal pillar, the sight hole investigation and other means, a study was conducted on the mine strata pre ssure behavior law of the mining gateway in No.3 seam of Chengzhuang Mine.In combination with the numerical simulation, the protective coal pillar width of the reappli ed gateway under the strong dynamic influences was set su.The results showed that with the high strength, high rigid and high pre-tensioned bolt and anchor combined support applied to the serious dynamic gateway, the surrounding rock failure depth of the gateway was only about 6 m, the width of the protective coal pillar was reduce d from previous 40 m to 30 m and the stressed force of the bolt and anchor all could reach over 40% of the broken force.Thus the support capacity of the bolt and anch or could be fully played.The loading capacity of the surrounding rock could be effectively played and the active support target could be reached.