Study on the mechanical properties of fully grouted bolts in circular tunnels considering the relative slip of the bolt-rock interface
In order to better reveal the interaction mechanism between the bolt and the surrounding rock,an elastic-plastic analytical model was established by considering the relative slip between the bolt and the surrounding rock.A simplified numerical program for solving the analytical model was proposed based on the finite difference method(FDM),and the numerical solutions of the proposed model were obtained using MATLAB software programming.The proposed model was verified by comparing it with the experimental data.Subsequently,the effect of the elastic modulus and dilatancy angle of rock mass and the end plate stiffness on the support performance of the fully-grouted bolt was analyzed.Finally,in order to explore the optimal installation time of bolt,the support performance of bolt under different stress release rates were also investigated.The results showed that,before the stress release rate exceeds 60％,the support performance of the bolt decreased linearly with the increase of the stress release rate;Afterwards,the support performance of it rapidly decreased.Therefore,it was best to install the bolt be-fore the stress release rate does not exceed 60％.
万方数据
维普
