Support Technology of Seam Gateway with Magmatic Rock Intrusion of Carboniferous System in Datong Mining Area

Based on the Carboniferous System seam with magmatic rock intrusion in Datong Mining Area, thus made the seam structure complicated and the minin g and support difficult of the coal miming face, taking the gateway support design of the fully mechanized top coal caving mining face in No.5 seam of Hulonggou Mine, Datong Coal Mine Group as an example, the paper introduced the high pre-tension bolt and 'birdOs nest' anchor support technology.The ANSYS numerical simulation s oftware was applied to analyze and calculate the soft and broken ring in the surrounding rock of No.5 seam.The length of the bolt was selected as 2 200 mm and the mi n pre-tension was selected as 60 kN.With the comprehensive monitoring and measuring of the gateway support, after the gateway was in the stable stage, when the pul ling force of the roof bolt would be 70.6 kN, the pulling force of the anchor was 86.7 kN and the convergence of the roof and floor was 35 mm, the roof would have no 0 bvious bed separation phenomenon, the surrounding rock of the gateway would be stable and the support effect would be excellent.