Abstract: The cavern unreinforcement and reinforcement effects of two kinds of rock bolts to the caverns under the explosive plane wave loading are studied from four aspects, i.e., surrounding rock stress， circumferential strain and acceleration of cavern wall, and roof-to-floor relative displacement, through antiexplosion model test. The intensity attenuation laws of explosive plane waves along vertical and horizontal directions are analyzed. The differences of the circumferential strain and accelerations of cavern wall，and the roof-to-floor relative displacement are compared for the unreinforced cavern, and the caverns reinforced by the full-length bonded rock bolts and the non-full-length bonded rock bolts. The results indicate that the intensity attenuation speed of explosive plane wave in vertical direction is slower than that in horizontal direction. The acceleration and deformation resistance of the arch roof are the largest and the acceleration of the floor is the smallest in each cavern. Arch foot is a place where the tensile strain is very easy to occur in caverns. The reinforcement of rock bolts can change the tensile deformation of surrounding rock of arch foot to compression deformation. The arch roof and floor of cavern reinforced by the full-length bonded rock bolts produce relatively large accelerations. However， the full-length bonded rock bolts are better than the non-full-length bonded rock bolts in some aspects, such as reducing the deformation of arch， the roof-to-floor relative displacement and the acceleration of side wall.

Key words: rockbolt, explosiveplanewave, cavern, modeltest, reinforcementeffect