Yeh, F.-H.F.-H.YehWeng, M.-C.M.-C.WengGe, L.L.GeYU-NING GE2021-02-042021-02-042020https://scholars.lib.ntu.edu.tw/handle/123456789/547397https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084945837&partnerID=40&md5=d93b4be3d0c2abe083f5fefad4ad9d26The 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.Elastoplastic model; Sandstone; Tunnel[SDGs]SDG11ABAQUS; 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; Tunnelsconference paper2-s2.0-85084945837Yeh, F.-H.;Weng, M.-C.;Ge, L.