Technology Application Of Deep Hole Presplitting Blasting To Improve The Efficiency Of Gas Extraction In Liyazhuang Mine

In order to ensure safety in production and improve the efficiency of gas extraction,Shenyang Branch of China Coal Research Institute was entrusted to increase the seam gas permeability coefficient by the way of deep hole presplitting blasting by Liyazhuang Mine.Based on the theory of gas migration in coal seam and deep hole presplitting blasting, combined with the actual situation of the mine, they put forward the specific embodiment for Lane 2261 in Stope 2-226 and designed the diameter of control hole as 94mm and the diameter of blast hole as 114mm by application of control theory.According to the actual situation at the scene, the adjusted the pre-program, the hole spacing was decided as 7m and reached the aim of prioritization scheme and rational utilization of site condition.By comparing with the efficiency of gas extraction of the neighbor Stope 2-224, the efficiency of gas exaction was increased from 30% to 45%, it provided safeguard for mine safety.The gas pre-extraction time was shortened from 6 months to 3 months, they got the gas pre-extraction effect.