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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.13 No.3
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An experimental study on the load transfer machanism of shallow 2-Arch tunnel excavation sequence with vertical discontinuity planes in sandy ground

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2011, v.13 no.3, pp.215-231


& (2011). An experimental study on the load transfer machanism of shallow 2-Arch tunnel excavation sequence with vertical discontinuity planes in sandy ground. (사)한국터널지하공간학회, 13(3), 215-231.
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Abstract

In this study, the behavior of a shallow 2-Arch tunnel during the excavation in the sandy ground containing vertical discontinuity plane was experimentally studied. Load transfer mechanism in the pillar caused by a 2-Arch tunnel excavation was observed. The position of the vertical discontinuity plane was varied. Model tests were carried out in the normal construction sequence of 2-Arch tunnel. Test results, showed that the load transfer caused by the 2-Arch tunnel excavation was concentrated in the discontinuity plane, and was cut by the discontinuity plane, so no load transfer took place above the discontinuity plane. It was also shown that the effect of adjacent tunnel excavation on the pillar load and the ground deformation was greater when excavating the upper half-face of the main tunnel, more than when excavating the lower half-face.

keywords
2-Arch 터널, 연직 불연속면, 이완하중, 하중전이, 이완영역, 2-Arch tunnel, vertical discontinuity plane, load transfer, loosening area, 2-Arch tunnel, vertical discontinuity plane, load transfer, loosening area

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