Research on the Upper Bottom Drainage Roadway Layout Layer Location and Surrounding Rock Control Technology of Floor Confined Water
In response to the existing problems of difficulties in controlling the surrounding rock and the easy occurrence of water inrush accidents in the bottom drainage roadway of Guhanshan Mine under high stress and floor confined water conditions,a comprehensive method of theoretical analysis,numerical simulation,and on-site testing is used to study the occurence mechanism of water inrush in the bottom drainage roadway floor and the damage characteristics of surrounding rock.A comprehensive governance technology for the surrounding rock of the bottom drainage roadway is proposed.The research results indicate that the existing asymmetric plastic zone in the surrounding rock of the bottom drainage roadway increases the risk of water inrush after the thickness of the floor waterproof layer decreases;The reasonable layout location of the bottom drainage roadway should have a vertical distance of 12 m from the coal seam floor and a horizontal internal displacement of 8 m from the stoping roadway;Adopting the method of improving support strength and cooperating with grouting to achieve coordinated governance of the bottom drainage roadway;During the experiment period,the deformation of the roof and floor of the bottom drainage roadway is 252 mm,and the deformation of the two sides is 219 mm,which improves the gas extraction rate,ensures safe mining of the working face,and provides technical reference for the governance of bottom drainage roadways under similar geological conditions.
floor confined waterbottom drainage roadwayfloor water inrushsurrounding rock control
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