Abstract
References
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Rock mass shows various failure modes and deformation behavior types according to the stress state of rock mass. In the case of underground excavation such as a tunnel and cavern the prediction of the variation of stresses is difficult, when the stress-path from the initial state of stress to the current state is complex. This study presents the stress-path of the rock mass around a tunnel analyzed by a 3-D finite element. The traces of stress-paths in the principal stress plane from its initial state of stress to the completion of excavation are also presented in this study for some specific locations around the tunnel. To evaluate the stability of observation points, relationship between stress-path and Mohr-Coulomb failure envelope, and that between stress-path and Hoek-Brown failure envelope were analyzed, respectively.
암반에 작용하는 응력의 상태에 따라 암석의 역학적 거동은 취성 거동에서 연성 및 소성 거동에 이르기까지 다양한 파괴양상과 변형 거동을 보인다. 특히 터널, 캐번 등 지하공동 굴착시 초기응력 상태에서 현재의 응력 상태에 도달하기까지 암반이 겪은 응력경로가 복잡한 경우에는 쉽게 예측할 수 없다. 본 연구에서는 3차원 유한요소해석을 통해 지하굴착에 의한 암반의 응력경로를 분석하였다. 공동 주변의 필요한 특정 위치에서 초기 응력 상태로부터 굴착작업 종료 시까지 응력성분들의 변화를 추적하여 주응력 평면에 응력경로를 도시하였다. 계측점의 안정성 평가를 위해 응력경로와 Mohr-Coulomb 파괴포락선 및 Hoek-Brown 파괴포락선과의 관계를 분석하였다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 47
- No :1
- Pages :61-69
Journal of the Korean Society of Mineral and Energy Resources Engineers
