Failure characteristics and control technology of bottom drainage roadway on floor confined water
In response to the problem of water inrush accidents from the floor and low gas extraction efficiency caused by the unreasonable selection of the bottom drainage layer during the excavation of the bottom drainage roadway on confined water,taking the bottom drainage roadway of the 1508 working face in Guhanshan Mine as the research background,the mechanism of water inrush from the floor and the distribution characteristics of the plastic zone of the surrounding rock were analyzed,and the reasonable layout layer of the bottom drainage roadway was determined.The surrounding rock's collaborative control technology was proposed,and on-site experiments were conducted.Research shows that the uneven plastic zone of the sur-rounding rock of the bottom drainage roadway significantly reduces the thickness of the floor waterproof layer and increases the risk of water inrush from the floor.The distance between the bottom extraction roadway and the coal seam floor is 12 m in the vertical direction,and 8 m in the horizontal direction;Adopting comprehensive methods such as strengthening the bearing capacity of the anchoring system,improving the stability of the bottom corner rock layer,adding protective surfaces,and local grouting reinforcement(or grouting anchor cables)were carried out.During the experiment,the deformation of the roof and floor of the bottom extraction roadway was 233 mm,and the deformation of the two sides was 209 mm,which re-mained basically stable.The extraction rate of gas drainage holes has been significantly improved,ensuring safe mining of the working face.
floor water inrushbottom drainage roadway treatmentgas extractionsurrounding rock controlgrouting rein-forcement
国家科技期刊平台
NSTL
万方数据
