Study on Application of Deep Borehole Pre-Fracturing Blasting Technology to Seam Opening in Mine Shaft
Abstract：According to a long period to sink through a low permeability and outburst seam during a mine shaft sinking in Huainan Mining Area and the mining and excavation connection highly restricted problems, a new method of the deep borehole pre-fraeturing blasting was provided to improve the seam permeability, to improve the seam gas drainage rate and to reduce the seam opening time of the mine shaft sinking. The paper had a study mainly on the function mechanism of the seam permeability improvement and the outburst prevention with the deep borehole pre- fracturing blasting. The paper had a simulation and analysis on the blasting with a loosing radius of 4 m in No. 13-1 seam of No. 2 Mine Auxiliary Shaft in the mine and the borehole pattern plan to open the seam in the mine shaft was Optimally designed. The site investigation showed that after the deep borehole pre-fracturing blasting conducted for the seam permeability improvement, the gas drainage pure volume was increased by 4 times than before the blasting conducted, the seam gas drainage rate was improved and thus the 13-1 seam opening time of the mine shaft sinking was reduced by 32 days.
Keywords：coal and gas outburstseam opening in mine shaftdeep borehole pre-fraeturing blastingloosened radius
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)