A 3-D analytical continuous upper bound limit analysis for face stability of shallow shield tunneling in undrained clays

Habumuremyi, Providence; Xiang, Yanyong

doi:10.1016/j.compgeo.2023.105779

Cited by 5 publications

(1 citation statement)

References 21 publications

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“…The construction of a tunnel between two cities offers a direct connection, circumventing the need for detours sometimes encountered in conventional land transportation. Consequently, this infrastructure development reduces the distance between the cities and enhances overall traffic efficiency [1][2][3][4]. Transport vehicles can be directly carried to their destination through underwater tunnels or submarine pipelines, thereby circumventing issues such as congestion and traffic accidents commonly encountered in land traffic.…”

Section: Introductionmentioning

confidence: 99%

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

Huang,

Han

2024

Buildings

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The construction of multiple tunnels across inland rivers has had a significant influence on the improvement of the transportation infrastructure. The technology for constructing tunnels is progressing towards the development of larger cross-sections, longer distances, and the ability to withstand high hydraulic pressure in complex hydrogeological conditions, including high-permeability strata. In order to ensure the face stability of shield tunnels under high hydraulic pressure that crosses a fault fracture zone, it is necessary to study the progressive failure mechanism of shield tunnel faces induced by high hydraulic pressure seepage. This paper employs finite element numerical simulation software to methodically examine the variation in the characteristics of the water seepage field, limiting support force, and face stability failure mode of shield tunnels passing through fault fracture zones with high hydraulic pressure under varying fault fracture width zones. The results show that the formation hydraulic gradient will progressively widen when the tunnel face is located within the undisturbed rock mass and is advanced towards the area of fault fracture. This will raise the likelihood of instability in the shield tunnel and progressively raise the limiting support force on the tunnel face. Moreover, as the tunnel face nears the region of fault fracture within the undisturbed rock mass, the damage range increases gradually. In addition, due to the increase in seepage force, the angle between the failure area and the horizontal plane becomes more and more gentle. On the contrary, as the tunnel’s face moves closer to the undisturbed rock mass from the region of the fault fracture, the damage range gradually decreases, and the dip angle between the damage area and the horizontal plane becomes steeper and steeper due to the decreasing seepage force in the process. The study findings presented in this work are highly significant, both theoretically and practically, for the design and management of safety.

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Section: Introductionmentioning

confidence: 99%

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

Huang,

Han

2024

Buildings

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Study on the Rationality of Tunnel Plane Strain Model Based on Stress Release Principle

Zhao,

Liu,

Chen

et al. 2024

Lecture Notes in Civil Engineering

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Based on the finite element difference software FLAC3D, a three-dimensional refined simulation model for tunnel excavation and a plane strain model based on the stress release principle were established. By comparing the deformation characteristics of surrounding rock and the stress distribution of support structures, it is concluded that, apart from slight differences in the stress distribution of the steel arch, the results of the plane strain model and the three-dimensional refined model show high consistency in the deformation characteristics of surrounding rock and the stress distribution of anchor bolts. The calculated results for the maximum load on a single anchor bolt differ by 13.25%, and the differences in surrounding rock deformation and the maximum load on the steel arch are both less than 8%. The plane strain model based on the stress release method can well match the three-dimensional refined model, indicating its feasibility for practical engineering analysis.

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Analysis of Factors Influencing Tunnel Block Collapse in Blocky Rock Masses: Insights from Large-Scale Model Experiments and DDA Simulations

Liping,

Hongyun,

Hongliang

et al. 2024

Rock Mech Rock Eng

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A 3-D analytical continuous upper bound limit analysis for face stability of shallow shield tunneling in undrained clays

Cited by 5 publications

References 21 publications

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

Study on the Rationality of Tunnel Plane Strain Model Based on Stress Release Principle

Analysis of Factors Influencing Tunnel Block Collapse in Blocky Rock Masses: Insights from Large-Scale Model Experiments and DDA Simulations

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