Application and Mechanism of Mine Strata Pressure Pumping Prevention with Multi Stage Blasting Pressure Releasing Technology

OUYANG Zhen-hua

doi:10.13199/j.cnki.cst.2014.10.008

Abstract：Based on a mine with high strata pressure pumping dangers affected by the complicated geological condition and the mining con-dition as a study object,a multi stage blasting pressure releasing technology conducted from roof,floor and seam was provided to prevent the mine strata pressure bumping disaster.The method combined with a theoretical analysis,numerical simulation and site test were applied to analyze the mine strata pressure bumping prevention mechanism and effect of the multi stage blasting pressure releasing technology.The numerical simulation results showed that before and after the multi stage blasting pressure releasing conducted,a location distance of an ad-vance support pressure peak to the coal wall was increased from 19 m to 23 m and the stress concentration coefficient was reduced from 1. 35 to 1. 10.The location distance of a lateral support pressure peak to the gateway sidewall was increased from 6 m to 13 m and the stress concentration coefficient was reduced from 1.35 to 1.18.The site results showed that after the multi stage blasting pressure releasing con-ducted,the stress and drilling cutting value of the borehole were obviously reduced,electromagnetic radiation intensity was obviously in-creased and the working resistance of the powered support was reduced by 45% in maximum. Therefore,with a cutting off of the stress transmission channels from the roof,floor and seam,the multi stage blasting pressure releasing technology could make a high stress zone in the seam displacing forward to the deep area of the seam,could effectively reduce the stress in the coal and rock masses and the bumping danger of the coal mining face.The good mine strata pressure bumping prevention effect was obtained.