Ground Surface Displacements and Failure Mechanisms induced by EPB Shield Tunneling Method and Groundwater Levels Changes

Due to the growth of the population in urban areas, metro tunnels are the most important means of transportation. Hence, it is necessary to study the tunneling conditions and their effects on the nearby structures. In addition, internal tunneling pressure and groundwater level changes affect the gro...

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Bibliographic Details
Published in:Transportation infrastructure geotechnology 2023-08, Vol.10 (4), p.616-638
Main Authors: Vali, Ramin, Foroughi Boroujeni, Farah
Format: Article
Language:English
Subjects:
Building Materials
Computer simulation
Constitutive models
Earth pressure
Engineering
Failure mechanisms
Finite element method
Foundations
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Groundwater
Groundwater levels
Hydraulics
Internal pressure
Mathematical models
Plane strain
Population growth
Pressure
Series (mathematics)
Subway tunnels
Technical Note
Tunnel linings
Tunneling
Tunneling shields
Tunnels
Urban areas
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Summary:Due to the growth of the population in urban areas, metro tunnels are the most important means of transportation. Hence, it is necessary to study the tunneling conditions and their effects on the nearby structures. In addition, internal tunneling pressure and groundwater level changes affect the ground surface displacements, significantly. This research considered the changes of the groundwater level and the uniform internal pressures simultaneously in simulating the earth pressure balance (EPB) shield tunneling method before the tunnel lining installation. The study applied a series of 2D finite element models of the tunnel longitudinal and transverse sections to evaluate the Isfahan metro's surface displacements and the optimum internal pressure. Mohr–Columb constitutive model and the plane strain assumption were adopted in numerical simulations. Different types of failure mechanisms of the ground surface in the longitudinal section were proposed by concentrating in vertical and horizontal displacements. The results showed that uniform internal pressure equal to 300 kPa caused the minimum ground surface displacements in the Isfahan metro project.
ISSN:2196-7202
2196-7210
DOI:10.1007/s40515-022-00239-1