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Title: Discussion on the mechanism of ground improvement method at the excavation of shallow overburden tunnel in difficult ground
Authors: Kishida, Kiyoshi kyouindb researcher_resolver
Cui, Ying
Nonomura, Masaichi
Iura, Tomomi
Kimura, Makoto
Author's alias: 岸田, 潔
Keywords: Auxiliary method
Shallow overburden
Soft ground
Ground improvement
Settlement
Issue Date: Dec-2016
Publisher: Elsevier BV
Journal title: Underground Space
Volume: 1
Issue: 2
Start page: 94
End page: 107
Abstract: Tunnel construction opportunities involving shallow overburdens under difficult (e.g., soft, unconsolidated) grounds have been increasing in Japan. Various auxiliary methods for excavating mountain tunnels have been developed and can satisfy stringent construction requirements. The ground improvement method, which is one of the auxiliary methods for shallow overburden tunnels, has demonstrated its ability to effectively control the amount of settlement under soft ground. However, the mechanism of the ground improvement method has not been clarified, nor has a suitable design code been established for it. Therefore, because the strength of the improved ground and the suitable length and width of the improved area have not been fully understood, an empirical design has been applied in every case. In this paper, the mechanical behavior during the excavation, including that of the stabilized ground, is evaluated through trapdoor experiments and numerical analyses. In addition, the enhancement of tunnel stability resulting from the application of the ground improvement method is discussed.
Rights: © 2016 Tongji University and Tongji University Press. Production and hosting by Elsevier B.V. on behalf of Owner. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
URI: http://hdl.handle.net/2433/220413
DOI(Published Version): 10.1016/j.undsp.2016.11.003
Appears in Collections:Journal Articles


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