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The Case of Measurement for Shallow Soil Tunnel with Pre-Supported Nail Method  

Seo, Dong-Hyun (주식회사 현이앤씨)
Lee, Seung-Ho (상지대학교 공과대학 토목공학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.11, 2012 , pp. 69-79 More about this Journal
Abstract
This pre-supported nail method is able to decrease ground displacements more than NATM because this method reinforces ground with grouted steels before tunnel excavation. Therefore this method has advantage of being able to increase the stability and workability. This study presents applicability of pre-supported nail method with case of site measurement for shallow tunnel composed with high groundwater level and unconsolidated soil, performs this research the mechanism of new supporting system is compared with the conventional existing supporting system in terms of soil reinforcement. NATM has characteristics that construction stage displacement of the apparent height difference is observed in the step of divided excavation processing. Otherwise it is analyzed that pre-supported nail method is not sensitive in the displacement problem of excavation processing in comparison to NATM. It is found that this method is very applicable in shallow depth tunnel such as portal area, tunnel in soil and weak zone without arching effect.
Keywords
Shallow tunnel; Pre-supported nail method; Measurement Control system; Tunnel in soil;
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