Rapid Seam Opening and Outburst Prevention Technology of Three Soft Seam with Deep Depth and High Outburst
Abstract：According to the high outburst dangerproblem in No.B1 seam in Xinyi Mine,with the analysis on the advantage and disadvantage of the different outburst prevention technical measures for the seam opening working face at the crosscut,the side cut-off of the gateway,the cross borehole gas drainage in the gateway with the standing blasting in the short pilot chamber were applied to rapidly open the three soft seam with serious outburst.The results showed that with 40 days gas drainage operation,the gas drainage rate of the seam opening working face was reached to 34.6%.Before the seam opened,the previous gas content was 6.37~12.84 m3/t.After the outburst prevention measures with the centralized gas drainage conducted,the residual gas content value would be 6.50~8.00 m3/t.Before the seam opened,the outburst prevention measures effect inspected the drilling cutting gas desorption index Δh2 of the seam opening working face and the max value was 80 Pa.The above measured index could show that after the rapid seam opening technology applied in the three soft seam with serious outburst,the outburst danger of the seam opening working face was eliminated.After the standing blasting applied to the seam opening,the max value of the gas volume fraction would be only 0.04% and the No.B1 seam was safety and successfully opened.
Keywords：three soft seamdeep depthseam opening at crosscutcoal and gas outburstseam opening and outburst prevention technology
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)