Applied research of bolt-inject support technology in deep coal mine extremely unstable coal roadway

Anchor bolt and grouting combination supporting technology has both advantages of bolting support and can use grouting fissure filling surrounding rock fracture, blends anchoring, hole sealing, grouting technology for a whole, to the rock mass anchor external and grouting inside, bolt-inject form a multilayer effective combination arch and bearing load together. Anchor bolt and grouting technology adopted for extremely unstable roadway in Qinan Coalmine, control of roadway deformation successfully, and maintain roadway stability.