Study on the Effect of Rock Bolting Parameters on Rock Explosion Prevention

Rockburst is a dynamic disaster that seriously threatens the safety of underground constructions. There are many rockburst indexes, but none of them consider the supporting effect. This paper is based on both elastic strain energy theory and anchorage effect and bolt absorption theory. Moreover, the criterion for identifying the risk of rockburst under rock bolting is proposed. Taking the Caoguoshan tunnel as an example, the effect of rockburst prevention under different rock bolting parameters was studied. Four parameters were focused on, including bolt spacing, bolt length, bolt diameter, and bolt type. Experimental analyses were carried out under different rockburst grades, and the results show that the order of parameters’ impact on the rockburst criterion is bolt type＞bolt spacing＞bolt length＞bolt diameter. In addition, the optimal parameter selection for rock bolting under different rockburst grades is obtained, which provides a reference for the design of support measures for similar highland stress tunnels.