To study the reinforcement effects of different forms of bolt bolster plates under explosion

two different plates

namely face plate and bowl-shaped plate are selected in the field explosion test. Macroscopic failure pattern

displacement characteristics of tunnel wall

relationship between vault displacement and proportion distance

and vault displacements of both sides of explosion center are compared. Furthermore

reinforcement effects of the two plates on tunnels under the condition of explosion are analyzed. Test results show that bowl-shaped plate can bring tensile strength of bolt into full play; and stiffness of rock mass can be greatly improved. Reinforcement effect of bowl-shaped plate on rock are better than that of face plate.