Abstract To optimize the relationship between calculation accuracy and calculation time in the process of DDARF (discontinuous deformation analysis for rock failure), a DDARF multi-scale meshing method is set up in this paper, in which uniaxial compression models with multi-scale meshes and uniform meshes are established and a comparison between a numerical test and laboratory experiment is carried out. The multi-scale meshing method is applied to study areas adjacent to large underground caverns. Results show that the DDARF multi-scale meshing method is feasible; compared with the uniaxial compression test in the uniform meshing model, the calculation accuracy around the cracks is improved with the multi-scale meshing model using the same total mesh numbers, and the crack propagation law is more consistent with that obtained by the laboratory experiment; with the DDARF multi-scale meshing method applied to a large underground excavation, calculation time is reduced and efficiency is improved while the accuracy of calculations is maintained; and the displacement law is well aligned with that of the FLAC calculation results. The multi-scale meshing method improves the ability of the DDARF model to simulate propagation of cracks in the rock and has practical significance in the optimization analysis of stability for large geotechnical engineering.
Abstract：
To optimize the relationship between calculation accuracy and calculation time in the process of DDARF (discontinuous deformation analysis for rock failure), a DDARF multi-scale meshing method is set up in this paper, in which uniaxial compression models with multi-scale meshes and uniform meshes are established and a comparison between a numerical test and laboratory experiment is carried out. The multi-scale meshing method is applied to study areas adjacent to large underground caverns. Results show that the DDARF multi-scale meshing method is feasible; compared with the uniaxial compression test in the uniform meshing model, the calculation accuracy around the cracks is improved with the multi-scale meshing model using the same total mesh numbers, and the crack propagation law is more consistent with that obtained by the laboratory experiment; with the DDARF multi-scale meshing method applied to a large underground excavation, calculation time is reduced and efficiency is improved while the accuracy of calculations is maintained; and the displacement law is well aligned with that of the FLAC calculation results. The multi-scale meshing method improves the ability of the DDARF model to simulate propagation of cracks in the rock and has practical significance in the optimization analysis of stability for large geotechnical engineering.
2014, Vol. 51 