Pressur Relief Gas Extraction Technology Research In High Gas Group Of Coal Mining

China is rich in coal resources in the northwest region, shallow buried depth, coal thickness, but group of layers and for the coal seam group mining.Therefore, in the process of exploitation, on the adjacent layer of gas into the mining working face and goaf, bring new influence on the management of the gas.Study the dynamic gas distribution law of coal seam mining conditions, can provid a basis theoretical in drainaging gas of emission after mining.While the study under different conditions of mining overburden deformation and failure law of goaf, determine the overlying rock "three zone", is also the master of mining gas flow pattern and the key and precondition of mining and gas drainage.This paper relies on the science and Technology Department of Inner Mongolia major projects "study and comprehensive utilization technology of high-gas coal mine gas drainage in Wuda mining area", based on Wuda area Five Hu Shan mine actual production coal seam mining conditions, mining and gas occurrence law and control technology as the research object, the main content is divided into the following four parts:(1) Through theoretical analysis and related site information collection, to establish a coal seam group mining numerical model, the model is solved by using finite difference software calculation, the study of coal seam group mining mining spatial stress distribution law in the process.(2) Using the results of numerical simulation, observe the overburden the fixed observation points in the working face advancing distance after that point of force and displacement curve, determine the test scope face "three areas","three zones"(3) Analysis of gas emission of working face advancing process, and the working face gas emission forecast, according to the results of the prediction analysis of working face gas source.(4) Implemented according to the results of the analysis of the coal seam drainage, adjacent layer of pressure relief gas drainage in goaf mining, comprehensive gas control measures such as extraction, and select the typical area, the extraction gas drilling parameters, to demonstrate the effectiveness of control measures.