毕业设计论文 外文文献翻译 中英文对照 低透气性煤层瓦斯突出卸压原理及工程运用.doc

外文资料与中文翻译 外文资料： Principle and engineering application of pressure relief gas drainage in low permeability outburst coal seam Abstract: With the increase in mining depth, the danger of coal and gas outbursts increases.In order to drain coal gas effectively and to eliminate the risk of coal and gas outbursts, we used a specific number of penetration boreholes for draining of pressure relief gas.Based on the principle of overlying strata movement,deformation and pressure relief,a good effect of gas drainage was obtained. The practice in the Panyi coal mine has shown that, after mining the C11 coal seam as the protective layer,the relative expansion deformation value of the protected layer C13 reached 2.63%n, The nermeabilitv coefficient increased 2880 times, the gas drainage rate of the C13 coal seam increased to more than 60%, the amount of gas was reduced from 13.0 to 5.2 m3/t and the gas pressure declined from 4.4 to 0.4 MPa, which caused the danger the outbursts in the coal seams to be eliminated. The result was that we achieved a safe and highly efficient mining operation of the C13 coal seam. Keywords: protective layer mining; technology principle; drainage of pressure relief gas; engineering application 1 Introduction With an increase in mining depth, the amount and pressure of gas increases, gas disasters are becoming more serious and several shallow and non-outburst coal seams are gradually becoming outburst coal seams. Today, China has become the country with the most serious coal and gas outburst disasters in the entire world. Globally, our frequency and intensity of outbursts are the most severe. In contrast, coal and gas outbursts coal mines had been stopped production in the USA, Australia, Russia and other countries. According to a statistical analysis by expert consultants in 2005, among 415 coal mines of the 45 major monitored state owned coal enterprises, 234 mines are high gas and outburst coal mines, accounting for 56.4% of the major coal mines