Field Measurements and Finite-Element Method Simulation of a Tunnel Shaft Constructed by Pneumatic Caisson Method in Shanghai Soft Ground
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 137, Issue 5
Abstract
Characterized by unmanned excavation and remote controlling, the new pneumatic caisson (NPC) method has advantages in deep excavation such as deep shield tunnel shafts and some underground construction close to the existing structures or facilities. When adopted in urban areas, it is very important to control the ground deformation during a caisson construction. For this purpose, field measurements of ground deformation were conducted during a tunnel shaft construction in Shanghai soft ground, in which the NPC method was used. On the basis of the particular construction procedure of a pneumatic caisson, one kinematic mechanical model was proposed for evaluating the influence of NPC construction on the surrounding strata. This model was incorporated into a finite-element (FE) program. By comparing the FE-predicted results of the proposed model and the field measurements, the accuracy and reliability of this model were verified.
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Acknowledgments
The writers would like to thank the editor and the two peer reviewers for their great comments, which have enhanced the presentation of this paper. The funding support from National Key Technology R&D Program (Grant UNSPECIFIED2006BAJ27B02-02), NSFC (No. NSFC50679056, NSFC40972176), NCET (UNSPECIFIED06-0378), Shanghai Leading Academic Discipline Project (UNSPECIFIEDB308), and Kwang-Hua Fund for College of Civil Engineering (Tongji University) is acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 137 • Issue 5 • May 2011
Pages: 516 - 524
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Sep 22, 2009
Accepted: Oct 6, 2010
Published online: Oct 20, 2010
Published in print: May 1, 2011
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