Effect Assessment and Optimization Analysis of Drilling Gas Extraction in Mining-coal Bed

This paper firstly evaluates the gas extraction at C₅^b coal seam of Dashun Mine, and finds out the problems in the process of gas extraction. On the basis of this, the paper optimizes the methods of gas extraction and the pattern of the boreholes, designs the meliorative measure for increasing the drillsite of gas extraction and enriches the pattern of the boreholes.