go back button
October 07, 2019

Progressive failure due to tunnel misalignment with geostatic principal stresses

Osvaldo P. M. Vitali

Lyles School of Civil Engineering, Purdue University, West Lafayette, IN 47907, USA

Tarcisio B. Celestino

Sao Carlos School of Engineering, University of Sao Paulo, Sao Carlos, SP 13566, Brazil
Antonio Bobet

Lyles School of Civil Engineering, Purdue University, West Lafayette, IN 47907, USA


Abstract: "When the axis of the tunnel is not parallel to one of the far-field (geostatic) principal stresses, far-field axial shear stresses are present, which distort the tunnel in the axial direction and affect the stress paths of the ground near the face of the tunnel. The goal of the paper is to investigate the effects of tunnel misalignment with the far-field principal stresses on the progressive failure of the ground around the tunnel. A well-documented experimental tunnel in a massive granite rock mass is used as reference. 3D FEM modelling is conducted to back calculate the tunnel response and to assess the effects of the tunnel misalignment. The misaligned tunnel shows failure at locations not predicted when the tunnel is aligned with the intermediate principal stress. The numerical results suggest that the misalignment may lead to asymmetric spalling of the tunnel walls."


Read More!



Search Keyword search-icon


      Popular Tags

      midas GTS NX Tunnel MIDAS Academics Research Paper Foundation Dam Underground Excavation 3D Wall Construction Consolidation Soil Structure Interaction 2D Pile Construction Stage 3D FEM midas GTS numerical analysis Seepage Dynamic Slope Embankment Ground Rail Seismic Spalling groundwater midas Gen pressure settlements 3D modelling Alpine Base Tunnels Analysis of Finite Element Methode Bridge Combined Pile-Raft Foundations Complex Concrete Couple Analysis Coupled Analysis Culvert DDM Design Design analysis Displacement Diversion Tunnel Double shield TBMs El Nino Elastic modulus Excavating Finite Element Foundation Differential Settlements Fracod Geometry Geostatic High-rise building Highly Expansive Hoek-Brown criterion Intersection Live Load Analysis Long Drought Season Long deep tunnels Monte Carlo ONKALO Parametric study Progressive Failure Purdue Q-z curve Raft Foundations Safety Factor Shrinkage Simultaneous Blasting Soil Soil Modeling Spalling prediction Squeezing Structural Analysis Structural Design Substructure T-z curves Thermal Analysis Vertical stress Void Creation alluvial anisotropic properties axial shear stresses barrette raft base buoyancy phenomenon numerically collapse compact crystalline rock deepening elasticity embedded pile element finite element method foundation design fractured zone geological investigation geomechanical parameter geophysics ground resistance hydraulic behavior instrumentation junction limestone cavity linear-elastic ground load transfer curves load transfer mechanism mechanism non linear analysis numerical analysis of pile group numerical method numerous large pile systems o-cell loading packer permeability testing pile group pile loading portal pressuremeter testing rail tunnel seismic loading sensitivity analysis shaft shallow depths spillways standard penetration testing stress and strain subsea