A Meso/Macroscale Theoretical Model for Investigating the Large Deformation of Soft Rock Tunnels Considering Creep and Anisotropic Effects

• DOI: 10.1007/s00603-023-03306-2
• Publication Date: 2023-04-03T15:43:16Z
• Authors: Chang Xia; Zhen Liu; Cuiying Zhou; Lihai Zhang
• Keywords: Brittleness; Deformation mechanism

Abstract The rheological deformation of soft rock resulting from tunnel excavation can lead to significant construction and safety challenges. In this study, a multiphase numerical model was developed simulate the surrounding after excavation. considers coupled meso/macroscale creep damage processes using discrete element method–finite method (DEM–FEM). particular, accumulation at mesoscale (i.e., initial phase before excavation, loading due disturbance creep-induced leading large deformation) were incorporated into model. predictions validated field monitoring data. By incorporating process model, predicted time-dependent displacements face agree reasonably well with addition, results demonstrate that brittle accumulated in mineral clusters severely leads instantaneous deformation, which becomes less important evolution stage. Furthermore, indicate final is characterized by high sensitivity value modeling parameters.