Abstract
Tunnel Misalignment with Geostatic Principal Stress Directions in Anisotropic Rock Masses
Highlights
The literature shows that rock masses are likely to present pronounced geostatic stress anisotropy and anisotropic mechanical properties
For Case 2, where the far-field axial shear stress is neglected, no anti-symmetric axial displacements are induced and so, no asymmetric radial deformations occur near the face
The asymmetric deformations near the face occur because the anti-symmetric axial displacements are constrained by the face of the tunnel
Summary
The literature shows that rock masses are likely to present pronounced geostatic stress anisotropy and anisotropic mechanical properties. Convergence measurements of tunnels constructed in the Underground Research Laboratory (URL) in France showed the importance of the tunnel orientation with respect to the geostatic principal stress directions These tunnels were excavated in an anisotropic claystone rock mass at 490 m depth, with average principal stress ratios sh/sv = 1 and sH/sv = 1.3 (Wileveau et al, 2007). Tonon and Amadei, (2002, 2003) and Fortsakis et al (2012) highlighted the importance of considering the anisotropic properties of the rock mass in numerical models to obtain more accurate ground deformation predictions (they assumed, that the tunnel was aligned with the geostatic principal stresses).
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