Experimental study on shear behavior of Polyurethane/water glass-filled planar rock joints

Rock joints are widespread in nature and have become a major obstacle to the safe development of underground space. Grouting reinforcement is widely adopted to reduce engineering disasters induced by joint sliding instability. In this study, direct shear tests of Polyurethane/water glass (PU/WG)-filled planar rock joints under constant normal stress conditions were carried out to investigate the effects of normal stress σn, PU/WG layer and curing time T on the shear behavior, shear strength and surface damage of filled joints.