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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.20 No.3
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Experimental study on the tunnel behavior induced by the excavation and the structure construction above existing tunnel

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2018, v.20 no.3, pp.640-655
https://doi.org/10.9711/KTAJ.2018.20.3.640


& (2018). Experimental study on the tunnel behavior induced by the excavation and the structure construction above existing tunnel. (사)한국터널지하공간학회, 20(3), 640-655, https://doi.org/10.9711/KTAJ.2018.20.3.640
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Abstract

Recently, the construction of the urban area has been rapidly increasing, and the excavation work of the ground has been frequently performed at the upper part of the existing underground structures. Especially, when the structure is constructed after the excavation of the ground, the loading and unloading process in the ground under the excavation basement can affect the existing underground structures. Therefore, in order to maintain the stability of the existing underground structure due to the excavation of the ground, it is necessary to accurately grasp the influence of the excavation and the structure load in the adjoining part. In this study, the effect of the excavation of the ground and the new structure load on the existing tunnel was experimentally implemented and the influence of the adjacent construction on the existing tunnel was investigated. For this purpose a large testing model with 1/5 scale of the actual size was manufactured. The influence of ground excavation, width of the load due to new structure, and distance between centers of tunnel and of excavation on the existing tunnel was investigated. In this study, it was confirmed that the influence on the existing tunnel gets larger, as the excavation depth get deeper. At the same distance, it was confirmed that the tunnel displacement increased up to three times according to the increase of the building load width. That is, the load width influences the existing tunnel larger than the excavation depth. As the impact of the distance between centers of tunnel and of excavation, it was confirmed that tunnel crown displacement decreased by 48%. The result showed that a tunnel is located in the range of 1D (D: tunnel diameter) from the center of excavation, the effect of excavation is the largest.

keywords
기존터널, 하중폭, 구조물하중, 영향범위, 모형시험, Existing tunnel, Load width, Influence distance, Structure load, Test model

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