Study on Effect Evaluation of Protective Seam Mining

According to the gas control measures made for the protective seam mining in Jinling Mine, based on the mine geological gas exploration information, th e paper discussed the rationality of the protective seam mining.The paper introduced the mining method for the below protective seam and the gas drainage method wit h boreholes through the floor strata and evaluated the effect of the protective seam mining. The results showed that after the mining measures made in the protective se am of the high gassy mine, the seam pressure would be released and great cracking would be occurred in the seam.The max gas content value and the max gas press ure would be all reduced below the critical values individually as 8.00 m3/t and 0.74 MPa.Thus the seam gas deposit law would be changed, the seam permeability woul d be improved, the gas drainage effect would be improved and the coal and gas outburst danger would be highly reduced.