Numerical Simulation on Load Transfer Mechanism of Multiinterface Composite Rockbolt

Abstract:

Based on the Abaqus program,a pullout test of the composite rockbolt was simulated.Considering the main failure mode of the rockbolt,i.e.interface failure,an improved cohesive element was employed to simulate the four interface materials,and an axisymmetric elastoplastical finite element model was built to analyze the pullout test.It is concluded that the axial stress and the shear stress distribute along the steel strand exponentially.The bond strength will be overcome with the increase of the load,and the peak of shear stress will move to the far end of the bolt.The peak shear stress along the bamboocomposite material interface and the bamboomortar interface will move accordingly with that of the master interface.Under the constraint of the composite material and cement mortar with higher stiffness,the peak axial stress is located on the middle of the bamboo.The shear stress along the mortarsoil interface increases from the near end to the far end due to the different boundary condition.A comparative study shows the numerical simulation agrees well with the measured data,so the numerical method is certificated to be effective.