Failure mechanism of the deep-buried metro tunnel in mixed strata: Physical model test and numerical investigation

Qiu, Jutao; Zhou, Xiaojun; Shen, Yu-Sheng; Zhang, Xi; Yu, Bingxin; Luo, Yi

doi:10.1016/j.tust.2023.105224

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…Due to the construction conditions of this project are under the engineering geological conditions and technical conditions of construction in China, the study compares with Duan [33] and Cui [34] on the results of the force analysis of the segments in shield technology and Jiang [35] on the simulation results of the displacement of the tunnel construction process for comparison and verification, and refers to the findings of Qiu et al [36] and Zhu et al [37] on the structural force characteristics of tunnels. According to these references, It can be shown that the findings of this study for the initial support, segments and guide platform of the tunnel are in line with the results of general research on the structural forces of tunnels and can be verified as reasonable.…”

Section: Discussionmentioning

confidence: 99%

Study on the Stress and Deformation Characteristics of Shield Tunneling Through Mining Tunnel Structure

Du¹,

Zhou²,

Fei³

2023

Preprint

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In the construction of shield crossing existing mined tunnel without load, it is imperative to develop corresponding design standards that reflect actual engineering force characteristics to ensure the successful completion of tunnel construction. This research uses The MIDAS-GTS finite element software to facilitate the creation of a numerical model of the shield structure for an air-push-over mine tunnel project in Changsha, China, investigating the stress field’s evolution during shield construction, and calculating the maximum positive and negative bending moments and maximum axial forces for different structures and other force states under various construction conditions. This study's findings informed the design and construction optimisation of the shield tunnelling empty-push method. The outcomes of this numerical simulation led to several key findings: (1) The soil density exerted a significantly greater impact on the internal forces of the initial support structure than both the tunnel depth and soil Poisson's ratio. Additionally, a sudden shift in internal forces occurred within the 300-350 mm range when the lining thickness was altered. (2) Factors such as the tunnel depth, soil density, soil Poisson's ratio μ, and lining thickness have a similarly influenced internal forces of the segment and the initial support. Notably, the backfill layer thickness significantly affected the segment’s maximum axial force causing an abrupt change of approximately 300 mm. (3) Under the shield machine equipment’s weight constraint, it is essential to control the guide rail’s thickness, to prevent it from becoming overly large.

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Section: Discussionmentioning

confidence: 99%

Study on the Stress and Deformation Characteristics of Shield Tunneling Through Mining Tunnel Structure

Du¹,

Zhou²,

Fei³

2023

Preprint

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show abstract

“…Specifically, x and y normal fixed constraints were utilized for the horizontal constraints, and a z fixed constraint was applied to the bottom, as shown in Figure 3a. The modified Mohr-Coulomb criterion derived from Mahendra et al's [32] and Massinas et al's [33] closed solutions for the plastic zone and stress distribution around circular tunnels in the elastic-plastic semi-infinite plane based on the Mohr-Coulomb yield criterion and Li's [34] analysis of the Yumo railway project in China was adopted as the failure criterion for the grid elements using practical engineering experience as a basis. Solid elements were employed to simulate each soil layer.…”

Section: Numerical Calculation Model and Methodsmentioning

confidence: 99%

“…The burial depth of the tunnel not only impacts the initial support but also influences the segment through the lining. By modifying the burial depth H of the tunnel to 24,26,28,30,32,34, and 36 m while keeping the other simulation parameters of the soil layer constant, the evolution of the bending moment and axial force in the segment was obtained, as illustrated in Table 7 and Figure 7a. From the analysis, it can be observed that the variation trend of the internal force variation in the segment is similar to that of the initial support when the burial depth of the tunnel changes.…”

Section: The Influence Of Soil Poisson's Ratio On the Forces Experien...mentioning

confidence: 99%

Investigation on the Stress and Deformation Evolution Laws of Shield Tunnelling through a Mining Tunnel Structure

Zhou

Fei

2023

Applied Sciences

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In the construction of a shield crossing an existing mined tunnel without load, it is imperative to develop corresponding design standards that reflect actual engineering force characteristics to ensure the successful completion of the tunnel construction. This study uses the MIDAS-GTS NX 2022 finite element software to facilitate the creation of a numerical model of a shield structure for an air-push-over mine tunnel project in Changsha, China while investigating the stress field’s evolution during shield construction and calculating the maximum positive and negative bending moments and maximum axial forces for different structures and other force states under various construction conditions. This study’s findings informed the design and construction optimisation of a shield tunnelling empty-push method. The outcomes of this numerical simulation led to several key findings: (1) The soil density exerted a significantly greater impact on the internal forces of the initial support structure than both the tunnel depth and soil Poisson’s ratio. Additionally, a sudden shift in internal forces occurred within the 300–350 mm range when the lining thickness was altered. (2) Factors such as the tunnel depth, soil density, soil Poisson’s ratio μ, and lining thickness similarly influenced the internal forces of the segment and the initial support. Notably, the backfill layer thickness significantly affected the segment’s maximum axial force, causing an abrupt change of approximately 300 mm. (3) It is essential to control the guide rail’s thickness under the shield machine equipment’s weight constraint to prevent it from becoming overly large.

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Managing Inverted Arch Heaving in Sanlian Tunnel: Analysis of Inverted Arch Structure Utilizing Prestressed Anchor Rods

Wang,

Krishta David,

Mansor

et al. 2024

Geotech Geol Eng

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Failure mechanism of the deep-buried metro tunnel in mixed strata: Physical model test and numerical investigation

Cited by 6 publications

References 28 publications

Study on the Stress and Deformation Characteristics of Shield Tunneling Through Mining Tunnel Structure

Study on the Stress and Deformation Characteristics of Shield Tunneling Through Mining Tunnel Structure

Investigation on the Stress and Deformation Evolution Laws of Shield Tunnelling through a Mining Tunnel Structure

Managing Inverted Arch Heaving in Sanlian Tunnel: Analysis of Inverted Arch Structure Utilizing Prestressed Anchor Rods

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