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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.12 No.5
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study on stresses and displacements of the ground according to the closure ratio of tunnel face during tunnel excavation

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2010, v.12 no.5, pp.369-378


& (2010). study on stresses and displacements of the ground according to the closure ratio of tunnel face during tunnel excavation. (사)한국터널지하공간학회, 12(5), 369-378.
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Abstract

This paper presents a new approach of closing the tunnel face with sprayed concrete to reduce the stress at the tunnel face and displacement occurring at the ground surface during tunnel excavation. In order to carry out this research, the experimental and numerical studies are performed. In the experimental study, the model tests are carried out according to the closure ratio of tunnel face, tunnel depth and tunnel excavation length. The model test results are analyzed and interpreted by numerical calculation in order to verify both results obtained from experimental and numerical studies. It is clearly found that the tunnel face stability is decreased in decreasing the closure ratio of tunnel face. The results also show that the tunnel face is stabile when the closure ratio of tunnel face is larger than 80%. This research will be very useful to develop the economical tunnel face closing system.

keywords
터널막장폐합비, 숏크리트, 모형실험, Closure ratio of tunnel face, sprayed concrete, model test

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