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Face failure analysis of a shield tunnel with slurry penetration into the ground
Highlights A time-dependent pressure transfer mechanism of the bentonite slurry was proposed. A multifield model coupling seepage flow and face stability of the tunnel was developed. The support effectiveness of slurry decreases with the slurry penetration into the ground. The influence of the hydrogeological and slurry properties on face stability was discussed.
Abstract This paper focuses on the face stability analysis of a tunnel driven by a slurry shield machine in the water-bearing ground. A multifield model coupling seepage flow and face stability of the tunnel is developed. The slurry-soil interaction in the ground is considered as a multiphase flow process in porous media. The kinematic approach of limit analysis is used to assess the tunnel face failure. The pressure transfer mechanism of the bentonite suspension is time-dependent and shows good agreement with the field measurement. This model allows the consideration of the slurry support efficiency and its influence on the failure shape through the discretization technique. The results obtained indicate that the support effectiveness decreases with the slurry penetration into the ground, and the traditional membrane model leads to an overestimation of the face stability. Several charts are provided for parametric analysis to discuss the influence of the hydrogeological and slurry properties.
Face failure analysis of a shield tunnel with slurry penetration into the ground
Highlights A time-dependent pressure transfer mechanism of the bentonite slurry was proposed. A multifield model coupling seepage flow and face stability of the tunnel was developed. The support effectiveness of slurry decreases with the slurry penetration into the ground. The influence of the hydrogeological and slurry properties on face stability was discussed.
Abstract This paper focuses on the face stability analysis of a tunnel driven by a slurry shield machine in the water-bearing ground. A multifield model coupling seepage flow and face stability of the tunnel is developed. The slurry-soil interaction in the ground is considered as a multiphase flow process in porous media. The kinematic approach of limit analysis is used to assess the tunnel face failure. The pressure transfer mechanism of the bentonite suspension is time-dependent and shows good agreement with the field measurement. This model allows the consideration of the slurry support efficiency and its influence on the failure shape through the discretization technique. The results obtained indicate that the support effectiveness decreases with the slurry penetration into the ground, and the traditional membrane model leads to an overestimation of the face stability. Several charts are provided for parametric analysis to discuss the influence of the hydrogeological and slurry properties.
Face failure analysis of a shield tunnel with slurry penetration into the ground
Jin, Dalong (author) / Yuan, Dajun (author) / Mao, Jiahua (author)
2022-05-06
Article (Journal)
Electronic Resource
English
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