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논문 기본 정보

자료유형
학술저널
저자정보
Khezri, Nima (UTM Construction Research Centre [UTM CRC], Institute of Smart Infrastructure and Innovative Construction, Universiti Teknologi Malaysia) Mohamad, Hisham (Civil and Environmental Engineering Department, Universiti Teknologi PETRONAS) Fatahi, Behzad (School of Civil and Environmental Engineering, University of Technology)
저널정보
테크노프레스 Geomechanics & engineering Geomechanics & engineering 제11권 제4호
발행연도
2016.1
수록면
471 - 492 (22page)

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Underground tunnelling is one of the sustainable construction methods which can facilitate the increasing passenger transportation in the urban areas and benefit the community in the long term. Tunnelling in various ground conditions requires careful consideration of the stability factor. This paper investigates three dimensional stability of a shallow circular tunnel in a layered soil. Upper bound theorem of limit analysis was utilised to solve the tunnel face stability problem. A three dimensional kinematic admissible failure mechanism was improved to model a layered soil and limiting assumptions of the previous studies were resolved. The study includes calculation of the minimum support pressure acting on the face of the excavation in closed-face excavations. The effects of the characteristics of the layers on the minimum support pressure were examined. It was found that the ratio of the thickness of cover layers particularly when a weak layer is overlying a stronger layer, has the most significant influence on the minimum tunnel support pressure. Comparisons have been made with the results of the numerical modelling using FLAC3D software. Results of the current study were in a remarkable agreement with those of numerical modelling.

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