Effect of the umbrella arch technique modelled as a homogenized area above a cross passage
Loading...
Date
2023-01-26
Journal Title
Journal ISSN
Volume Title
Publisher
Alternative Title(s)
Abstract
The stability of tunnel cross passages excavated in soft soil has always been a major challenge. In recent years, new techniques based on the installation of pre-reinforcements before tunnel excavation have been developed to control excavation-induced deformation and surface settlements. In this paper, a finite element numerical simulation was conducted to study the reduction effect of an umbrella vault element modelled as a homogenized area on the deformations induced after the excavation of a cross passage. The results of this study show that the ground deformations can be controlled efficiently by using this type of pre-reinforcement. However, the findings showed that there is no effect of the umbrella arch length on the reduction of the ground deformations. This paper represents a very good demonstration of 3D modelling of tunnel junctions using pre-support techniques; it is the most advanced/appropriate research tool for studying the behaviour of cross passages and is useful as a paradigm for other researchers and practitioners.
Description
Table of contents
Keywords
Cross passage, Numerical modelling, Ground surface settlement, Umbrella arch technique, Homogenization technique
Subjects based on RSWK
Tunnelbau, Verkehrsknotenpunkt, Setzung, Numerisches Verfahren, Finite-Elemente-Methode, Dreidimensionales Modell