[Purposes]After excavation and unloading of deep rock mass engineering,there is a common phenomenon of zonal fracture in the surrounding rock,which can easily lead to engineering accidents such as large deformation of the tunnel,large-scale collapse,and water inflow.The use of numerical simulation software can better reproduce this phenomenon,but numerical simulation mesh quality will have a greater impact on simulation results.In order to ensure the relative reliability of the simulation re-sults,it is necessary to study and analyze the numerical simulation mesh quality.[Methods]A numerical model of deeply buried multi-tunnels was established based on the strain softening model to study the ef-fects of grid symmetry and grid accuracy on the zonal fracture morphology,number and range of sur-rounding rock fracture zones.[Findings]The results show that the symmetry and accuracy of the grid will have a great impact on the simulation results of zonal fracture of the surrounding rock.Asymmetric grids and rough grids will cause large errors in the numerical simulation results of zonal fracture.[Con-clusions]Therefore,attention should be paid to the symmetry of the mesh and the selection of the unit size during the meshing process.This study has certain reference value for subsequent scholars to study this phenomenon through numerical simulation.
关键词
深部岩体/应变软化/围岩分区破裂化/网格对称性/网格精度
Key words
deep rock mass/strain softening/zonal fracture of surrounding rock/grid symmetry/grid ac-curacy
维普
万方数据