ABSTRACT
With increasing depth of underground mining, gas endowed stock and the risk of coal and gas outburst also increases, which has become a major factor that restricts mine production safety. Great coal seam gas pressure, high levels of tectonic coal thickness, permeability and poor in severe outburst coal, where construction is often difficult and drilling depth can not meet the design requirements, resulting in a larger area of the face appears Gas drainage blank tape, and affecting releasing of the gas[1-3]. Then can not reach the indicators related requirements. So, based on the principles of both the local and regional gas control, working face coal seam construction must be deeply holed, improving the level of yield advanced in the effective prevention of gas outburst, shorting cycle-mining, and increasing mining safety[4-7].
