Tunnel core12/22/2023 As a tunnel is excavated, there is a certain amount of deformation, usually 35-45% of the final tunnel wall deformation, before the support can be installed. Determine the amount of tunnel wall deformation prior to support installation.To design a support system, the following procedure can be used: The goal of this tutorial is to demonstrate how to model the tunnel deformation prior to support installation using the core replacement (material softening) approach. The support is to be installed 2m from the tunnel face. To compute the rock mass deformation modulus, the modulus ratio (MR) is assumed to be 400. The strength of the Schist can be represented by the Generalized Hoek-Brown failure criterion with the uniaxial compressive strength of the intact rock equal to 50 MPa, the GSI equal to 50 and mi equal to 10. The major principal stress is horizontal, and the minor principal stress is vertical. The in-situ stress field has been measured with the major in-plane principal stress equal to 30 MPa, the minor in-plane principal stress equal to 15 MPa and the out-of-plane stress equal to 25 MPa. This procedure is necessary to determine the amount of deformation prior to support installation.Ī circular tunnel of radius 4m is to be constructed in Schist at a depth of 550m. As the tunnel face advances away from the area of interest, the support decreases until the stresses can be accurately modelled with a two-dimensional plane-strain approach. In three dimensions, the tunnel face provides support. In this tutorial, RS2 is used to simulate the three-dimensional excavation of a tunnel. Application of Joint Networks (with XFEM)ģD Tunnel Simulation using Core Replacement 1.0 Introduction.Effects of Thermosyphon on Shallow Foundation.3D Tunnel Simulation using Core Replacement.Drawdown Analysis for Tunnel Excavation.
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