Study On Increasing Permeability Technique By Carbon Dioxide Pre-splitting Blasting In Wang Jialing Coal Mine

In order to increase coal seam permeability,improve the efficiency of gas extraction from coal seam,reduce the coal mine gas disasters,produced by the research on the permeability of coal sample coal fracture after the change of permeability,according to the liquid carbon dioxide gas when the temperature is higher than 31.5 ℃ instant vaporization characteristics,application of carbon dioxide presplit blasting anti-reflection technology principle,using liquid carbon dioxide blasting for anti-reflection coal seam.Using FLAC3D numerical simulation software for carbon dioxide in the process of the pre-splitting blasting of in-situ stress of coal seam,coal hardness,control of holes and different distance between porous continuous blasting anti-reflection effect on carbon dioxide presplit blasting for this paper.According to the results of numerical simulation,the optimum blasting hole and blasting device layout spacing in Shan Xi China Coal Hua Jin energy Limited Liability Company of Wang Jialing coal implement carbon dioxide presplit blasting anti-reflection technology test,the test results show that the coal seam permeability is significantly increased,the concentration of the borehole gas extraction,scalar and mixed amount were significantly improved.