The Theory and Application of Deep Hole Pre-splitting Blasting Improving Gas Extraction

摘要

At present,during extracting damp in loose and low permeability and high gas content coal seam,the conventional extraction methods used are not ideal.In Zhangcun coal mine,we take use of deep-hole controlled pre-splitting blasting technique to promote the permeability of coal seam and gas permeability.Through this method,gas drainage has been greatly improved,the permeability coefficient of the coal seam increases by five times and the capacity of single span gas extraction increases by three times.Therefore,the working environment of the working face is improved effectively and safe production is realized.