Roof falling mechanism and control technology of heading face in mine seepage roadway

In order to solve the roof falling accident problem easily occurred in the heading face of mine seepage roadway,based on seepage occurred in a cross- cut of No.3 roadway in Huale Mine and a large area roof falling phenomenon occurred after the heading operation,the rock mechanics experiment,X- ray detection and theoret ical analysis method were applied to study the large area roof falling mechanism.The results showed that there were disintegration and swelling materials in the surroundin g rocks and rock mudding phenomenon occurred when seepage caused in the mine roadway,thus mechanics performances of the surrounding rock were obviously reduced and could not support the roof effectively. According to the problems, the grouting control technology,the powerful bolt 1 steel mesh / anchor support technology and shotcret ing technology were provided. With applications of a shallow borehole grouting and deep borehole grouting techniques and series technology conducted,the convergence V alues between the roof and floor and the two sidewalls were controlled within 122 and 106 mm individually. When the surrounding rocks were stable,the anchor and bolt for ce reached 224,83 ~ 90 k N respectively. The deformation of the mine roadway was effectively controlled and the stability of the rock was ensured.