Simulation of Shield Tunneling Behavior along a Curved Alignment in a Multilayered Ground
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 6
Abstract
The kinematic shield model has been proposed to simulate shield behavior during excavation based on equilibrium condition, taking into account ground displacement around the shield. The model has been validated by the simulation of an earth pressure balanced shield behavior in a straight alignment for a single ground layer. To verify the model performance for shield tunnel excavation at curved alignment in multilayered ground, the slurry shield behavior is simulated in this study using the in situ data, and the immediate ground movements around the shield are computed by three-dimensional FEM employing the enforced displacement, which is obtained from the shield behavior simulation. As a result, it is found that the simulated shield behavior and the computed immediate ground movements around the shield during shield tunneling are in good agreement with the observations. Furthermore, the results reveal that the excavated area including the area generated by copy cutter is a predominant factor affecting the shield behavior, and the ground displacement, at the excavated surface plays an important role in the surrounding ground movements during shield tunneling.
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Acknowledgments
The writers would like to thank the Biwako Work Office in Ministry of Land, Infrastructure, and Transportation of Japan, and the Joint Venture for Ootsu Floodway Tunnel for providing the test-site data. Mr. Kazuya Maeda and Mr. Ryuuji Osada, formerly graduate students, are also acknowledged for their help in the analysis of the in situ data.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 133 • Issue 6 • June 2007
Pages: 684 - 694
Copyright
© 2007 ASCE.
History
Received: Feb 10, 2003
Accepted: Aug 23, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
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