Support Measures to Prevent the Deformation and Failure of a Carbonaceous Mudstone Tunnel

Wang, Yongdong; Jiang, Haitao; Yan, Xiaoxing; Liang, Huiru; Li, Guoan; Liu, Xiao; Peng, Hao; Wan, Shantong; Bai, Wei

doi:10.1155/2021/8833502

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…Mudstone is a type of soft rock that exhibits distinctive engineering properties. It has unique characteristics, including rheology, swelling, disintegration, and softening [12][13][14][15]. The strength of mudstone is typically weak, rendering the surrounding rock highly susceptible to significant displacement during tunnel excavation, which has a significant impact on construction safety.…”

Section: Engineering Backgroundmentioning

confidence: 99%

Analysis of the Surrounding Rock Full-Displacement Variation in Large-Span Mudstone Highway Tunnels

Chi,

Luo,

Chen

et al. 2024

Symmetry

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Due to the increasing development of highway reconstruction and expansion projects in China, many large-span highway tunnels are being constructed near existing highway tunnels. Tunneling underneath will inevitably cause variation in the surrounding rock displacement and may even lead to collapse. In this study, based on an analysis of extensive field monitoring data from the Gucheng tunnel, the variation law for the surrounding rock full-displacement and the influence of the tunnel-face spatial effect in a large-span mudstone tunnel are analyzed. The change in the full displacement experienced the following sequence: slow pre-displacement growth → rapid increase → slow increase → gradual stability. The displacement released by the excavation of the tunnel construction accounts for 40~60% of the total displacement, and the closer to the excavation contour, the more obvious the displacement release. The final convergence value of vertical displacement is obtained by hyperbolic function regression prediction analysis. Based on this value, Lee and Hoek equations are used for parameter analysis and field-data fitting. It is concluded that the larger the proportion of the early displacement of the surrounding rock before construction to the total displacement, the smaller the influence of the tunnel-face spatial effect on the surrounding rock. The numerical simulation results are compared with actual monitoring results, and good agreement is observed. The larger the burial depth of the tunnel, the smaller the influence range in the tunnel-face spatial effect, and the more concentrated the displacement release. The variation law and the influential range for the surrounding rock full-displacement described in this paper can provide a reference for predicting and controlling the deformation during the construction of future large-span mudstone tunnels.

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Section: Engineering Backgroundmentioning

confidence: 99%

Analysis of the Surrounding Rock Full-Displacement Variation in Large-Span Mudstone Highway Tunnels

Chi,

Luo,

Chen

et al. 2024

Symmetry

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show abstract

“…A large number of studies have shown that bolts can improve the mechanical parameters of surrounding rock, e ectively strengthen the bearing capacity of surrounding rock, and reduce the deformation of surrounding rock [43][44][45][46].…”

Section: Design Of Combined Support Scheme As Shown Inmentioning

confidence: 99%

Study on Instability Mechanism and Support Scheme of the Tunnel Face in Carbonaceous Phyllite Stratum under High Geo‐Stress

Song

et al. 2022

Advances in Civil Engineering

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The tunnel face collapses easily during tunnel construction in weak surrounding rock under high geo-stress. Identifying the instability mechanism of the face and proposing targeted control measures are of great importance to prevent the collapse of the face. Using the setting of the carbonaceous phyllite stratum of the Baima tunnel, a FLAC3D-PFC3D coupled model is used to analyze the influential factors on the stability of the face and optimize the original support scheme. The results show that the instability of the face is rooted in the collapse of the rock above the face, and the bench method with short cycle footage is more conducive to the stability of the face. Compared with single support mode of advanced small pipes, the combined support scheme of long bolts and small pipes can better control the displacement of the surrounding rock and prevent the collapse of the tunnel face. The numerical simulation and field surrounding rock monitoring results verify the rationality of the excavation method, the cycle footage, and the support system. This finding will be of great significance to guide design and construction in weak surrounding rock.

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Support Measures to Prevent the Deformation and Failure of a Carbonaceous Mudstone Tunnel

Cited by 2 publications

References 19 publications

Analysis of the Surrounding Rock Full-Displacement Variation in Large-Span Mudstone Highway Tunnels

Analysis of the Surrounding Rock Full-Displacement Variation in Large-Span Mudstone Highway Tunnels

Study on Instability Mechanism and Support Scheme of the Tunnel Face in Carbonaceous Phyllite Stratum under High Geo‐Stress

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