Verification and Analysis on Upper Limit Increased Coal Mining Method in Coal Mining Face of Panbei Mine

Because of the hydraulic powered support jammed accident occurred by the up limit increased mining in No.11014 coal mining face of Panbei Mine,in order to select a rational mining method for the coal mining face and to study and compare the predicted information of the coal mining face at the preparation period and the actual information of the coal mining face formed,in combination with the actual experiences of the up limit increased mining of the coal mining faces in Huainan Mining Area,the computer numerical simulation and theoretical analysis method were applied to verify the mining technique selected for the coal mining face and the fully mechanized coal mining was not suitable for the coal mining face.Meanwhile,the paper stressed the analysis on the advantage and disadvantage of the high rank conventional mining and the drilling and blasting mining and the safety protection measures applied to the drilling and blasting mining.The verification showed that the mine pressure behavior law of the up limit coal mining face was not well mastered,the roof control technology was not matured and there was a large risk of the powered support jammed existed in the application of the fully mechanized coal mining.Due to the limitation of the mining technique,the application of the high rank conventional mining would be easy to have the roof accident occurred.From the comprehensive analysis on the safety,technical and economic factors,the coal mining face would be suitable to have a drilling and blasting technique with the hydraulic single props and the connection beam.