Research On The Classification Of Gas Extraction Technology In Pingdingshan Mining Area

Gas extraction is the main measures of gas disaster prevention,and the geological structure conditions and gas occurrence conditions of different mining faces are different,and the most suitable gas extraction technology is different.Different gas extraction technologies have different construction costs and in order to prevent gas disasters more effectively under the conditions of lowest construction cost,it is necessary to rationally classify various gas extraction technologies in Pingdingshan mining area.There are two main purposes when using gas drainage technology to prevent and control gas disasters: one is to eliminate the gas outburst hazard of the mining face,and the other is to reduce the gas emission from the mining face,and this thesis classifies the various gas extraction technologies mainly used in Pingdingshan mining area based on these two purposes.In order to classify the gas extraction technology that needs to be used in 16 mining faces in Pingdingshan mining area,this thesis analyzes in detail the various gas extraction technologies mainly used in Pingdingshan mining area.According to the applicable conditions that different gas extraction technologies apply to mining faces of different outburst hazard levels.This thesis divides the outburst hazard level of each mining face into three grades.Then the influencing factors of various coal seam gas outbursts are analyzed in detail,and the fuzzy comprehensive evaluation of various influencing factors is carried out.The combination of AHP and Entropy method is used to obtain the comprehensive weight of various factors on the hazard level of gas outburst,and geological structure,dynamic phenomena during drilling,gas pressure and gas content were identified as the main influencing factors of gas outburst in Pingdingshan mining area.Based on the evaluation results of the outburst hazard level of each mining face obtained by the fuzzy comprehensive evaluation method,the mining layer gas extraction technologies are classified.According to the absolute gas emission,the gas volume exhausted by ventilation and the predicted gas extraction volume of the mining face gas extraction technology of each mining face,the goaf gas extraction technologies are classified.The construction cost of the four coal seam gas extraction modes used to eliminate the risk of gas outburst in the mining face and the construction cost of the four goaf gas extraction modes used to solve the gas emission from the upper corner were compared and analyzed separately.The comparison results verify the rationality of the classification of gas extraction technology mainly used in Pingdingshan mining area.The classification results are of great significance for reducing the construction cost under the premise of ensuring the prevention and control of gas disasters and effectively controlling the gas disaster in the Pingdingshan mining area.The thesis has 21 figures,18 tables and 79 references.