Deformation Response of an Existing Tunnel to Upper Excavation of Foundation Pit and Associated Dewatering
Publication: International Journal of Geomechanics
Volume 17, Issue 4
Abstract
Deep excavation clearly impacts existing underlying subway tunnels and threatens their operational safety. The prediction of existing tunnel deformation induced by nearby excavation is a major concern for urban construction. This research presents an analytical calculation method for predicting tunnel deformation induced by upside excavation and also discusses the role of dewatering in the deformation mechanism. First, the existing tunnel is assumed to be nonexistent in the soil, and the vertical unloading stress at the location of the existing tunnel caused by the upper excavation and associated dewatering is calculated. Second, the existing underlying tunnel is simplified as an elastic beam on a Pasternak foundation to calculate its vertical deformation. The proposed method was verified by the good agreement found between the predictions and the field measurements of the construction in the Shenzhen Chegongmiao hub project. Such an analytical method can provide fast and accurate evaluation results for similar engineering projects.
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Acknowledgments
The work presented in this paper was supported by the National Natural Science Foundation of China (Grant 51378505) and the China Postdoctoral Science Foundation (Grant 2016M592451).
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 17 • Issue 4 • April 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 18, 2016
Accepted: Aug 25, 2016
Published online: Sep 30, 2016
Discussion open until: Mar 1, 2017
Published in print: Apr 1, 2017
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