Assessment on Outburst Danger Before Mining at No.-660W2EB4 Coal Face in Liyi Mine

Base on the systematic collections on the gas pre-drainage information of the No. 660W2EB4 coal face in Liyi Mine, the heavy volume of gas and pre-pumping rates were calculated with a specific drainage measures in two parts,evaluated it with the use of comprehensive indicator method, the residual gas content and the residual gas pressure. The danger of coal and gas outburst has been eliminated at No.-660W2EB4 face.