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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.19 No.2

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Stability analysis of an existing utility tunnel due to the excavation of a divergence tunnel emerging from double-deck tunnel

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2017, v.19 no.2, pp.231-248
https://doi.org/10.9711/KTAJ.2017.19.2.231



Turab H. Jafri

Turab, H. J. , & (2017). Stability analysis of an existing utility tunnel due to the excavation of a divergence tunnel emerging from double-deck tunnel. (사)한국터널지하공간학회, 19(2), 231-248, https://doi.org/10.9711/KTAJ.2017.19.2.231

Abstract

Government plans to construct a double-deck tunnel under a portion of Gyeongbu Expressway that will solve traffic problems and could also be used as a flood storage facility. Divergence tunnels connect the main tunnel to the urban areas and their construction effects on adjacent structures at shallow depth need to be analyzed. This study primarily includes the numerical analysis of construction effects of divergence tunnels on utility tunnels. The utility tunnel was analyzed for three cases of volume loss applied to the divergence tunnel and two cases of the angle between main tunnel and divergence tunnel (36° and 45°). The results show that the more the volume loss was applied and the shorter the distance was between utility tunnel and divergence tunnel, the more the utility tunnel was affected in terms of induced displacements, angular displacement and stability. The worst scenario was found out to be the one where the angle between main tunnel and divergence tunnel was 36° and the distance between divergence tunnel and utility tunnel was 10 m, resulting in the largest displacement and differential settlement at the bottom of the utility tunnel. A relationship between the angular displacement and the distance to diameter ratio was also established.

keywords
Divergence tunnel, Utility tunnel, Volume loss, Angular distortion, Stability analysis, 분기터널, 공동구, 지반손실률, 각변위, 안정성 평가

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