ABSTRACT
Aiming at the rupture characteristics of the surrounding rock in deep coal roadway, the depressing mechanism for improving the stress condition of the surrounding rock and the support principle for raising the rock strength are studied by using the extensible bolting with high strength and breaking resistance as well as the grouting reinforcement. The comprehensive maintaining technologies such as rational depressing, bolting and grouting reinforcement are put forward. The researching results are successfully applied to the roadway support buried in 900 m deep coal seam and the obvious technical economic effect is obtained.
