Application of Powerful Anchor Support to Gateway of High Cutting Coal Mining in Island Seam

Abstract：According to theisurrounding rock serious failure in the mining gateway of No.2304 high cutting coal mining face in a island seam of Sihe Mine and to the conventional high strength bolt support no control to the serious deformation of the gateway,a investigation was conducted on the degree of the surrounding rock deformation in the gateway and the analysis was conducted on the cause of the gateway deformation.The numerical simulation software was applied to simulate the different pre-stressed force fields formed under the high pre-stressed powerful anchor with different length,space distance,row distance,angle and pre-stressed force.The simulation results showed that the high pre-stressed powerful anchor support could control the deformation of the gateway.When the powerful anchor was applied to No.23042 and No.23044 gateways of No.2304 coal mining face,the deformation of the gateway could be effectively controlled,the subsidence of the roof could be controlled within 100 mm and the convergence of the two sidewalls could be controlled within 200 mm.Thus the safety of the gateway could be ensured and the connection tension between the mining and excavation of Sihe Mine could be released.