Overhead Grouting Technology

Overhead Grouting Technology

  Overhead grouting is to inject grout into the coal and rock body with joints and fissures developed in a certain length range in front of the roadway headway in advance, so as to change the loose structure of the coal and rock body, close the fissures in the coal and rock body, and improve the adhesion, angle of internal friction and strength of the coal and rock body, so as to provide a reliable foundation for the anchors to hold on to. The grouting scope is mainly in the upper part of the two gangs and the top coal, and the grouting holes should be as close as possible to the periphery of the roadway along the direction of hole depth. The main technical parameters of overrunning