Gas Control in Initial Mining of Fully-mechanized Caving Mining Face
In view of the problems of large hanging area of gob and large gas emission from gob and adjacent strata during the initial mining of 3311 fully-mechanized caving face,in order to ensure the safety of working face,comprehensive gas management methods such as comprehensive optimization of ventilation,premature weakening of roof and strengthening gas extraction were proposed.The specific measures include:1)the ventilation mode of the mining surface was changed from U-type of"one-in one-out"to W-type of"two-in one-out";2)hydraulic fracturing technology was used to pre-weaken the roof of the working face and reduce the hanging area of the goaf roof during the initial mining;3)the construction of high directional long drilling was carried out in the connection roadway of 33112 roadway and 33113 roadway,and the construction of high hole+middle hole+through hole in the coal seam+floor hole was carried out in the end roadway,in order to improve the gas extraction in the gob and the adjacent layer.After the application of the project,the retained gas volume fraction of the air return corner and the retained air during the initial mining of the 3311 fully-mechanized caving face were controlled at 0.42%and 0.35%respectively,and the gas control effect was remarkable.
万方数据
维普
