Abstract
This paper is devoted to present a closed-form solution based on the approach of the conventional convergence-confinement method to study the effect of the movement of the tunnel face during the excavation on the stress-strain state of the surrounding medium and the interaction between the ground and the support for a deep tunnel in poroelastic anisotropic medium. In this study, a hydro-mechanical coupling behaviour of the ground at the steady-state of the groundwater flow will be taken into account. The obtained solution could be used as a quick tool to calibrate tunnels in elastic porous medium. Some numerical estimations indicate that, a hydro-mechanical model of the medium should be considered in tunnel design.
Highlights
One of the methods to study the tunnel excavation by two-dimensional plane strain problem, which can account for three-dimensional effect of the tunnel face to the sections behind and ahead of the face, is the convergence-confinement method (CCM)
The CCM takes into account the interaction between the ground mass and support and conditions of installation the support behind the tunnel face
When the tunnels are placed in the poroelastic anisotropic medium, it is a challenge in studying the interaction of the ground-support
Summary
One of the methods to study the tunnel excavation by two-dimensional plane strain problem, which can account for three-dimensional effect of the tunnel face to the sections behind and ahead of the face, is the convergence-confinement method (CCM). The CCM takes into account the interaction between the ground mass and support and conditions of installation the support behind the tunnel face. This approach is valid to calibrate the support/liner in the case of symmetric problem of deep, uniformly supported, circular tunnels embedded in an isotropic ground mass subjected to uniform in-situ stresses [1]. A closed-form solution based on the principle of the CCM to study the interaction between the ground and support for a deep tunnel in anisotropic poroelastic medium will be presented in which a hydro-mechanical coupling behaviour of the ground will be taken into account. The solution in this work can be considered as an extension of the solution presented in [4] for the case of poroelastic anisotropic material
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