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Stability assessment of tunnel face in a layered soil using upper bound theorem of limit analysis

Khezri, N. and Mohamad, H. and Fatahi, B. (2016) Stability assessment of tunnel face in a layered soil using upper bound theorem of limit analysis. Geomechanics and Engineering, 11 (4). pp. 471-492.

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Abstract

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. © 2016 Techno-Press, Ltd.

Item Type:Article
Impact Factor:cited By 24
Uncontrolled Keywords:Convergence of numerical methods; Excavation; Numerical models; Slope stability; Soils; Stability; System stability; Tunneling (excavation); Urban transportation, Layered soils; Minimum support; Passenger transportation; Stability assessment; Sustainable construction; Three-dimensional kinematics; Upper Bound; Upper bound theorem of limit analysis, Tunnels
ID Code:25687
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:27 Aug 2021 09:40
Last Modified:27 Aug 2021 09:40

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