Discussion on evaluation and implementation of pre-mining gas drainage standard in working face of gassy mine

Due to the difference of actual extraction conditions in different working face of gassy mine, there are some problems in the implementation of evaluation process of pre-mining gas extraction standards, such as the ambiguity of judgment flow and confusion of evaluation implementation methods under different conditions. In order to make the trade regulations more reasonable and operational in the implementation process, combined with the technical conditions of gas storage and drainage in coal seams of gassy mines, this paper analyzes and discusses several problems in the process of carrying out the evaluation of reaching the standards for extraction and mining under special conditions, such as the necessity of pre-extraction, the evaluation of the control range of pre-extraction and drilling, the evaluation of the time balance between extraction and mining, and the arrangement of the parameters for pre-mining evaluation, this paper puts forward some pertinent opinions and suggestions, and further supplements and consummates the technological process of gas drainage standard evaluation in gassy mine.