Abstract
Security of metro tunnels is extremely important, but the influence of new underground construction on existing tunnels has become more and more important. To control the existing tunnel deformation induced by an adjacent excavation, a novel construction method for excavations crossing above underlying tunnels, referred to as the divided alternate excavation method (DAEM), is presented in this paper. In this method, several dividing walls are constructed to divide the overlying excavation into small independent pits. During construction, several small pits are excavated at intervals simultaneously, and the remaining soil in other pits can resist the tunnel heave. After the underground structures of these pits are constructed, soil is backfilled onto their roof to decrease the rebound of the existing tunnels, and the remaining small pits can then be constructed. The proposed construction method is applied in the case of tunnel excavation above running metro tunnels. Field data reveal that the novel method has advantages in controlling deformation of the underlying metro tunnels.
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Acknowledgments
The financial support from the National Natural Science Foundation of China (NSFC Grant No.s 41172251, 41372282, 41330633) is gratefully acknowledged. This research is also sponsored by the Shanghai Pujiang Program (No. 13PJD017).
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Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 28 • Issue 6 • November 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 13, 2013
Accepted: May 27, 2014
Published online: Jul 16, 2014
Discussion open until: Dec 16, 2014
Published in print: Nov 1, 2015
ASCE Technical Topics:
- Buildings
- Construction engineering
- Construction industry
- Construction management
- Construction methods
- Excavation
- Existing buildings
- Geotechnical engineering
- Infrastructure
- Infrastructure construction
- Rail transportation
- Special condition construction
- Structural engineering
- Structures (by type)
- Subways
- Transportation engineering
- Tunnels
- Underground construction
- Underground structures
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