Nonlinear Analysis of Tunnel Deformation and Mechanisms of Stress Transfer Caused by Basement Excavation

Many new excavations are planned and constructed near or parallel to existing tunnels. Adjacent excavations may significantly impact the stress and deformation of existing tunnels. To evaluate deformation and the mechanisms of stress transfer, well-instrumented centrifuge model tests are back-analyz...

Full description

Saved in:
Bibliographic Details
Published in:Soil mechanics and foundation engineering 2018-11, Vol.55 (5), p.298-304
Main Authors: Sun, H. S., Wang, L. W., Chen, Y. D., Dong, Y., Zhang, J. H., Sun, W. B.
Format: Article
Language:English
Subjects:
Centrifuge model
Civil Engineering
Constitutive models
Construction planning
Deformation mechanisms
Earth and Environmental Science
Earth Sciences
Elongation
Excavation
Foundations
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Hypoplasticity
Knee
Model testing
Nonlinear analysis
Soil Mechanics
Soil stresses
Stress transfer
Three dimensional models
Tunnels
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Many new excavations are planned and constructed near or parallel to existing tunnels. Adjacent excavations may significantly impact the stress and deformation of existing tunnels. To evaluate deformation and the mechanisms of stress transfer, well-instrumented centrifuge model tests are back-analyzed using an advanced nonlinear constitutive model, known as a hypoplasticity model. Three-dimensional stress transfer mechanisms along the tunnel axis are demonstrated by changes in normal stresses in the soil around the tunnel. It is found that, for an existing tunnel located directly beneath the basement, the maximum reduction of earth pressure around the tunnel is about 50% at the crown and 20% at the springline of its initial earth pressure. As a result, the tunnel is vertically elongated and horizontally compressed. A tunnel, located at the side of a basement, is elongated along the connection between the right shoulder and left knee and compressed between the left shoulder and right knee. It is expected that this study will help improve the fundamental understanding of three-dimensional stress transfer during basement excavation around existing tunnels.
ISSN:0038-0741
1573-9279
DOI:10.1007/s11204-018-9540-2