Abstract:

Bolt is often analyzed as spar element with rough surface, which can only endure stress along the axial direction. But when it applied to jointed slope, it is more reasonable to consider both the axial and lateral effect of bolt due to the moving of joint plane. The models of mechanical characteristics with three springs and deformation characteristics are founded for bolt according to the theoretical analysis. In these models, the stress and deformation of bolt can be fully analyzed; in order to reflect the differences of dynamic and static displacements effect of jointed mass between the states of bolting and unbolting, the numerical calculation models of slopes are founded based on the perfect elastoplastic constitutive model, Mohr-Coulomb criterion, by numerical simulation technique of fast Lagrangian analysis of continua in 3D (FLAC3D). In the numerical simulations, the bolt element with three springs is applied. The analysis result shows that after bolting in jointed plane, the stiffness of rock mass is improved; the displacement of slope becomes smaller; the mutation magnitude of displacement beside joint plane becomes smaller; bolt system exerts the tensile effect for the upper and lower rock mass, and reduces the displacement in the joint plane, which is good to the slope stability.

Key words: bolt, jointed slope, mechanical characteristics, deformation characteristics, transverse action, dynamic and static displacements, FLAC3D