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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.19 No.6

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Experimental study on the influence of the ground surface slope on the longitudinal load transfer in shallow tunnel

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2017, v.19 no.6, pp.887-903
https://doi.org/10.9711/KTAJ.2017.19.6.887


& (2017). Experimental study on the influence of the ground surface slope on the longitudinal load transfer in shallow tunnel. (사)한국터널지하공간학회, 19(6), 887-903, https://doi.org/10.9711/KTAJ.2017.19.6.887

Abstract

Lots of shallow tunnels are constructed in the mountainous areas where the stress distribution in the ground around tunnel is not simple, also the impact of stress conditions on the longitudinal load transfer characteristics is unclear. The tunnel construction methods and the ground conditions would also affect the longitudinal load transfer characteristics which would be dependant on the displacement patterns of tunnel face. Therefore, in this study, the slope of the ground surface was varied in 0°, 10°, 20°, 30°, and the longitudinal load transfer depended on the deformation conditions of tunnelface (that were maximum deformation on the top, constant deformation, and maximum deformation on the bottom), and the stress distribution at tunnelface. As results, when the tunnelface deformed, the earth presure on the tunnelface decreased and the load at tunnel crown increased. The load transferred on the crown was influenced by the earth presure on tunnel face. Smaller load would be transfered to the wide areas when the slope of ground surface decreased. When the slope of ground surface became larger, the longitudinal load transfer would be smaller and would be concentrated on tunnelface, In addition, the shape of the transferred load distribution in the longitudinal direction was dependant on the deformation shape of tunnelface. The deformation shape of tunnelface and stress conditions in longitudinal sections would affect the shape and the magnitude of the load transfer in the longitudinal directions.

keywords
Tunnel face, Ultimate displacement, Shallow tunnel, Model test, Longitudinal load transfer, 굴진면, 한계변위, 얕은터널, 모형실험, 종방향 하중전이1. 서 론터널의

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