Numerical analysis on the impact of rock bolt parameters on stability of surrounding rock

Combined with the simulation of stability of surrounding rock based on strength reduction finite element method,the situation of plastic zone is studied varying with the discount factor.For different working conditions,comparing with different blot lengths,blot spacing distance and blot diameter,the result shows that rock bolt length is the most significant factor that influent the stability of surrounding rock,followed by the bolt spacing distance,and the last is blot diameter.Additionally,the regularity of the stability of surrounding rock after the tunnel excavation is investigated in the Yuntai mountain tunnel.The results presented indicate that the stability of surrounding rock in Yuntai mountain tunnel meets the construction requirements.