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아칭효과를 고려한 원형수직터널의 토압 특성 분석 (1) -원심모형실험 연구-
김경열(Kim, Kyoung-Yul),이대수(Lee, Dae-Soo),정산섬(Jeong, Sang-Seom) 한국지반공학회 2012 한국지반공학회논문집 Vol.28 No.2
The purpose of this study is to analyze earth pressure acting on a circular shaft-tunnel considering arching effect by centrifuge modeling test on sands. The centrifuge testing method provides a way to model an in-situ stress state condition with a stress gradient within a laboratory specimen. A small-scale model of circular shaft-tunnel, which has a real diameter of 6.0 m and height of 15.0 m, was designed and tested twice under 75g-level. Additionally, an effect of excavation was presented by separating two segments of circular shaft wall to find behavioral properties and strength of earth pressure along with excavating ground. The test results were compared with those of the proposed earth pressure equation. The test results showed that earth pressure decreased by about 70% in comparison with existing two-dimensional earth pressure. This fact might be attributed to three-dimensional arching effects.