Influence of Double-O-Tube Shield Rolling on Soil Deformation during Tunneling
Publication: International Journal of Geomechanics
Volume 17, Issue 11
Abstract
One of the main disadvantages of the advanced tunneling technology of the double-O-tube (DOT) shield is unavoidable rolling of the shield machine during construction. In this study, the influence of the DOT shield rolling on soil deformation during tunnel construction was analytically investigated. Based on the generalized Sagaseta’s solution, the equations for calculating vertical and horizontal soil deformations due to DOT shield tunneling–induced ground loss caused by shield rolling were derived. The theoretical results show that the deformation field of the surrounding soil is obviously changed from symmetry to asymmetry, and the maximum deformation increases observably with rolling. In the case of different rolling angles of the DOT shield, on any horizontal plane in the range of the burial depth of the shield top, an interesting rule was found where the vertical deformation curves have a focal point, whereas the horizontal deformation curves hold two focal points at which the corresponding deformation is constant with rolling. The balanced point of horizontal deformation, at which the horizontal deformation is zero and the maximum settlement occurs, moves gradually toward the rolling side with rolling. These findings from the analytical investigation provide a reliable background in predicting the soil deformation induced by DOT shield tunneling.
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Acknowledgments
The authors acknowledge the support from the National Natural Science Foundation of China (Grants 41172243 and 41472245) and the Fundamental Research Funds for the Central Universities (Grants 106112016CDJZR208804 and 106112014CDJZR200009).
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 17 • Issue 11 • November 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Jan 9, 2017
Accepted: May 25, 2017
Published online: Sep 13, 2017
Published in print: Nov 1, 2017
Discussion open until: Feb 13, 2018
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