Vehicle-induced dynamic response characteristics of a new subway tunnel closely undercrossing the existing subway

Zhang, Huijian; Liu, Gongning; Liu, Qiuyang; Chen, Zekun; Wang, Zhengzheng; Niu, Xiaoyu

doi:10.1016/j.soildyn.2022.107579

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…To reduce the impact about boundary effect, the distance from the tunnel outline to the boundaries is generally taken more than 3 times the tunnel diameters. Therefore, the model size is: length × height × longitudinal length =150 m×110 m×30 m. Normal constraint is set to the front, back, left, right as well as bottom boundaries of the model, and the up boundary is a free surface [25,26]. The rock and preliminary linings adopt solid element and shell element respectively, obeying Mohr-Coulomb yield criterions and elastic criterion respectively.…”

Section: Numerical Model and Calculation Parametersmentioning

confidence: 99%

Mechanical characteristics of large-section tunnel in soft rock based on various rock conditions and excavation footages

Xia,

Zhang,

Cao

et al. 2023

CEJ

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Taking the V-class surrounding rock section at the entrance and exit about Qianqi Tunnel as an example, the deformation rules as well as mechanics about the tunnel in different rock conditions and excavation footages are compared by numerical calculation, and the suitable excavation footage of the relied engineering is also proposed. The results show that the displacements about surrounding rock are greatly influenced by the excavation footage, namely, the arch settlements, horizontal convergences as well as surface settlement of the tunnel increase significantly with the excavation footage. For the preferred rock condition, the maximum bending moments about the preliminary linings at middle step after excavation occurs in the vault, and its increase amplitude has little correlation with the excavation footage. For the poor surrounding rock, the maximum bending moment is transferred from the vault to the arch waist with the increase of excavation footage, and it is basically manifested as the inner tension of the lining. The relationship between excavation footage and maximum deformation as well as mechanical index of vault is also revealed, respectively. The excavation footage of shallow-buried tunnel sections in V-grade surrounding rock is suggested, that is, 1.8m for the preferred surrounding rock condition and 1.2m for the poor surrounding rock condition.

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Section: Numerical Model and Calculation Parametersmentioning

confidence: 99%

Mechanical characteristics of large-section tunnel in soft rock based on various rock conditions and excavation footages

Xia,

Zhang,

Cao

et al. 2023

CEJ

View full text Add to dashboard Cite

show abstract

“…With the rapid development of urban rail transit networks, increasing demands of smoothness and safety of the in-service tunnels when subjected to limitation of available underground space, will conduct unforeseen adverse impacts on or even seriously damage to the adjacent in-service tunnels (Fang et al, 2022;Gan et al, 2022;Wei and Jiang, 2021;Zhang et al, 2022). To ensure the serviceability of underlying shield tunnels, it is necessary to study responses of tunnel construction on the adjacent existing shield tunnels in the complex environment (Fang et al, 2023;Ma et al, 2023;Wei, 2023;Zhang et al, 2023a;Zhang et al, 2023b;Zhou et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Analytical solution for heave of underlying shield tunnel caused by adjacent tunnelling considering shear deformation

Wei

2024

Preprint

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Excavating a shield tunnel may cause a series of unforeseen adverse impacts on the adjacent underlying in-service tunnels. Therefore, it is significant to reasonably evaluate the influence of the newly excavated tunnel on the existing underlying shield tunnel to ensure safety and applicability of the existing tunnels. In this study, a simplified analytical solution is proposed to rapidly evaluate the responses of an existing underlying tunnel caused by newly tunnel construction. An elastic Timoshenko beam model, considering the shearing deformation of the existing shield tunnel as well as the interaction between adjacent segments, is presented for evaluating the responses of underlying shield tunnel associated with the tunnelling-induced free ground settlement. An equilibrium differential equation, combined with the finite difference analysis, is derived for the responses of the underlying in-service tunnel. The adaptability and reliability of proposed analytical solution is verified in comparison with published measurements. The predicted values were compared with the calculation results of different foundation coefficients. Parametric analyses are showed to evaluate the effects of various factors on the responses of underlying in-service tunnel, including the skew angle, equivalent shear stiffness and bending stiffness of underlying existing tunnel.

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Online long-distance monitoring of subway vibration reduction effect using ultra-weak fiber Bragg grating arrays

Liu

Wang

et al. 2023

Measurement

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Vehicle-induced dynamic response characteristics of a new subway tunnel closely undercrossing the existing subway

Cited by 4 publications

References 9 publications

Mechanical characteristics of large-section tunnel in soft rock based on various rock conditions and excavation footages

Mechanical characteristics of large-section tunnel in soft rock based on various rock conditions and excavation footages

Analytical solution for heave of underlying shield tunnel caused by adjacent tunnelling considering shear deformation

Online long-distance monitoring of subway vibration reduction effect using ultra-weak fiber Bragg grating arrays

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