| Popis: |
The discontinuous deformation analysis (DDA), proposed by Shi, is a powerful numerical method that can be used for modeling rock-structure interaction. The method is only capable of modeling the point anchoring rockbolt. To reflect the deformation mechanism of rockbolt nearby the fracture surface and the interaction between the rockbolt and the fracture surface, the paper presents the simulation of the full length rockbolt to the DDA method. It is assumed that the rockbolt has no deformation in rock mass and its restriction effect on the fracture surface can only be considered. The full length rockbolt has been implemented by applying normal and tangential springs to the fracture surfaces. A tunnel was modeled to evaluate the influence of reinforcement on the tunnel stability by using the extended DDA method. The simulation results indicate that the modified discontinuous deformation analysis (DDA) method is effective for the reinforcement of tunnel. It is shown that the modified discontinuous deformation analysis (DDA) method is reasonable and correct. |
