Influence of soil constitutive models on settlement prediction of urban tunnelling

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Publication Title
Influence of soil constitutive models on settlement prediction of urban tunnelling

Abstract
The validity of material models is a major field of research in soil mechanics. Different constitutive models have distinct stress-strain behavior, which can affect the results of the predicted deformation, failure mechanism, and load- bearing capacity of a geotechnical structure. In this regard, in this contribution, the application of three constitutive models in a Finite Element Analysis (FEA) of a well-documented case study is presented. This case study - Arash-Esfandiar tunnel - is a particular under-passing tunnel in the north of Tehran, Iran, starting from Modares highway and running to Niayesh highway. The tunnel project has a total length of 1532 m and was constructed with shallow overburden. The results indicate the necessity of using axial and bending elements as tunnel support measures at the same time. According to the large span of the tunnel and the geotechnical conditions, a combination of 4 different support elements was propose which includes, nails, micropiles, fore poling and, lattice girder. Various monitoring stations, including settlement points and geodetic points, have been installed as part of this project, providing extensive records of subsidence and tunnel deformation. The main goal of the numerical simulations is to investigate the influence of the material models on the results of accumulated subsidence for the stage construction method. The analysis outputs have been validated on available monitoring results of this actual tunnelling project. The results show a significant better performance of the hardening soil model when simulating the tunnel construction effects on the deformations of the excavation area and comparing them with the measurements results.
Authors
B. Salehi; B. S. Muntau

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

D - Current and new construction methods

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