Assessment and Optimization of Soil Mixing and Umbrella Vault Applied to a Cross-Passage Excavation in Soft Soils
Publication: International Journal of Geomechanics
Volume 14, Issue 6
Abstract
Focusing on three-dimensional finite-element analysis (FEA) for the assessment and optimization of reinforcement treatment using deep soil-mixing and umbrella vault methods to stabilize a cross-passage excavation in soft alluvial soils, this paper presents parametric studies, interpretation analyses, and details of the modeling technique for the reinforcement treatment and the excavation process. Displacements at the crown of the cross passage are estimated and used as the basis for assessment and optimization for the reinforcement. Optimization could account for savings of about 50% in the cost of soil mixing. The analysis indicates that simulated displacements can be reduced significantly when both the soil-mixing and the umbrella vault techniques are used. Deep soil mixing is more effective and adaptable, whereas the umbrella vault method has to be used jointly with other techniques to stiffen the upper soil layers. The simulation results further demonstrate that the progress of the excavation influences the crown stability, but such influence also depends on the soil conditions after reinforcement. Based on the findings in this paper, it has been concluded that construction sequence and risk-control measures can be arranged based on the simulation outcomes to achieve savings in construction time and cost.
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Acknowledgments
The authors are thankful to a shield and underground construction company in Guangzhou for providing the detailed information for the project and financial support of the research. This research endeavor was also partially supported by the National Key Science and Technology Research Plan of China (Grant No. 2012BAJ01B01). The authors are grateful for the comments of the four anonymous reviewers and the coeditor, which greatly helped the manuscript revision.
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Published In
International Journal of Geomechanics
Volume 14 • Issue 6 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 11, 2013
Accepted: Nov 12, 2013
Published online: Nov 14, 2013
Discussion open until: Sep 1, 2014
Published in print: Dec 1, 2014
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