Implementation of a nonlinear elastoplastic model for tunneling in sandstone
Journal
16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019
Date Issued
2020
Author(s)
Abstract
The most active infrastructure constructions for transportation take place in the western Taiwan due to dense population. Hillside development is a vital issue for urban planning. Adequate understanding of sedimentary rocks, e.g. sandstone, mostly weak rock, plays an important role in the construction of tunnels; therefore, properly evaluating deformation of rock is essential. To mimic the deformation characteristics of sandstone, such as shear stress and volumetric strain coupling behavior, a nonlinear elastoplastic model based on the theory of Green elasticity and generalized plasticity has been implemented into finite element code ABAQUS through user-defined subroutine UMAT. A series of triaxial tests of a single element are first simulated to verify the model. After the verification, excavation of a tunnel is simulated under plain stain condition. This study concludes that the model is capable of describing the deformation characteristics of tunnel excavation in sandstone and provides a valuable tool for future engineering practice. Copyright © Soil Mechanics and Geotechnical Engineering, ARC 2019.All rights reserved.
Subjects
Elastoplastic model; Sandstone; Tunnel
SDGs
Other Subjects
ABAQUS; Deformation; Elastoplasticity; Geotechnical engineering; Sandstone; Shear stress; Soil mechanics; Tunneling (excavation); Deformation Characteristics; Elasto-plastic models; Engineering practices; Finite element codes; Generalized plasticity; Infrastructure construction; User-defined subroutine umat; Volumetric strain; Tunnels
Type
conference paper