Effects of Pillar Depth and Shielding on the Interaction of Crossing Multitunnels
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 141, Issue 6
Abstract
Any new tunnel excavation may damage adjacent existing tunnels in congested cities. To evaluate the impact of new tunnel construction on nearby existing tunnels, a series of three-dimensional centrifuge model tests were conducted with numerical backanalyses using an advanced hypoplasticity constitutive model. The influences of the pillar depth-to-diameter ratio (P/D) on two-tunnel interaction and the effects of shielding on three-tunnel interaction were investigated. The maximum measured settlement of an existing tunnel caused by a new tunnel excavation at P/D of 0.5 underneath was approximately 50% larger than that when P/D was 2.0. This is attributed to a smaller mobilized shear modulus, resulting from a larger reduction in confining stress of soil acting on the invert of the existing tunnel in the former than in the latter. When the new tunnel was excavated underneath two perpendicularly crossing tunnels, the lower existing tunnel “shielded” the upper one from the influence of tunnel excavation. As a result, the settlement of the upper existing tunnel was 25% smaller than in the case without the shielding tunnel.
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Acknowledgments
The authors would like to acknowledge financial support from the Research Grants Council of the HKSAR (General Research Fund Project No. 617410) and would also like to thank Kelly Lim for her assistance in making the donuts for the centrifuge model tests.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 141 • Issue 6 • June 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Mar 9, 2014
Accepted: Dec 18, 2014
Published online: Feb 24, 2015
Published in print: Jun 1, 2015
Discussion open until: Jul 24, 2015
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