미고결 지반에서의 터널붕락 메커니즘 분석
Mechanism Analysis of Tunnel Collapse in Weak Ground
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초록
터널굴착기술이 발달된 근래에도 터널붕괴사고는 지속되고 있다. 본 논문은 미고결 지반에서 발생하는 대표적인 두 가지 사례를 제시하였다. 각각의 사례에 대한 터널붕괴원인을 계측기록과 수치해석 모델링을 통해 분석하고 붕괴메커니즘을 고찰하였다. 이로부터 미고결 지반에서 터널붕괴의 핵심 지시자는 전단변형율과 지하수위의 변화이며, 터널붕괴는 굴착과정에 따라 터널주변의 전단변형이 어떠한 양상으로 발전되느냐와 밀접히 관련되어 있음을 알 수 있었다.
Abstract
Despite the recent improvement in tunnel excavation technique, Tunnel collapse accidents still happen. This paper suggest two typical cases in unconsolidated ground condition. Collapse causes of each case were analyzed by the measurement records and numerical simulation, and then mechanism of tunnel collapse was investigated about each case. From this study, the crucial indicators of tunnel collapse were the variation of shear strain and ground water level, also, tunnel collapse deeply related to how shear deformation around tunnel was developed according to the excavation step.
참고문헌 (5)
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- Okuda, M., "Nonlinear analysis of a shallow tunnel", Journal of Geotechnical Engineering, 638, pp.383~388 (1999), JSCE
- Shin, J. H., "Lessons from serial tunnel collapses during construction of Seoul subway line 5", Tunneling and Underground Space Technology, 21, pp.296~297 (2006)
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