Numerical Study on the Deformation of Tunnels by Excavation of Foundation Pit Adjacent to the Subway

Zhao, Xiang; Wang, Hanxuan; Li, Zhongwei; Dai, Guoliang; Yin, Ziwei; Cao, Shuning; Zhou, Junlong

doi:10.3390/app12094752

Cited by 22 publications

(12 citation statements)

References 18 publications

(18 reference statements)

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“…Substituting Equation (8) into Equation (10), it can be obtained that the vertical deformation of the underlying tunnel satisfies the following Equation (11):…”

Section: Tunnel Deformation Caused By Excavation Of Foundation Pitmentioning

confidence: 99%

“…Numerical simulations have been a common calculation method used in civil engineering to predict construction-induced disturbances and risks. Zhao et al [10] introduced the support structure for complex foundation pit projects, accumulating experience in the selection of support structures for similar projects. MIDAS/GTS software is used to establish a finite element model to evaluate the effect of excavation of different sections of the foundation pit on the tunnel deformation, and the accuracy of the finite element calculation results is verified by comparing the monitoring data; Xu et al [11] presented a finite element parametric study of tunnel behavior caused by a nearby deep foundation excavation, analyzing the effects of tunnel location relative to the excavation, tunnel diameter, excavation dimensions, and tunnel protection measures on tunnel deformation.…”

Section: Introductionmentioning

confidence: 99%

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Measurement and Analysis of Deformation of Underlying Tunnel Induced by Foundation Pit Excavation

Yin,

Xin,

Zhenggang

et al. 2023

Advances in Civil Engineering

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The excavation of a foundation pit can exert a notable impact on the underlying tunnel. This research paper aims to analyze and synthesize measured deformation outcomes caused by foundation pit excavation on the underlying tunnel. The paper employs a two-stage analysis approach to derive the calculation formula for additional stress and the deformation control equation of the adjacent tunnel under the influence of foundation pit excavation. Subsequently, the Hermite spectrum method is applied to transform the deformation control equation of the underlying tunnel into a set of linear equations, enabling the determination of the deformation curve. To verify the precision of the theoretical calculation method, a comparative study is conducted between theoretical results and actual measurements. Moreover, a sensitivity analysis of crucial project factors is performed. The research findings reveal minimal disparity between theoretical calculation outcomes and measured deformation of the underlying tunnel, thus affirming the accuracy and rationality of the theoretical calculation formula. The excavation of the foundation pit leads to an uplift deformation in the underlying tunnel, resulting in an “n”-shaped deformation profile. Notably, the stiffness of the foundation soil and the depth at which the tunnel is buried emerge as pivotal factors influencing the deformation of the underlying tunnel. As the stiffness of the foundation soil and the depth of tunnel burial increase, the uplift deformation gradually diminishes, albeit within a restricted range of reduction.

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“…Substituting Equation (8) into Equation (10), it can be obtained that the vertical deformation of the underlying tunnel satisfies the following Equation (11):…”

Section: Tunnel Deformation Caused By Excavation Of Foundation Pitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of Deformation of Underlying Tunnel Induced by Foundation Pit Excavation

Yin,

Xin,

Zhenggang

et al. 2023

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…On the other hand, Su et al [11] designed and executed a large-scale model test of a pile-anchor-supported foundation pit with a geometric similarity ratio of 1:10. Wei et al [12] used the virtual image technique to calculate the soil displacement caused by the deformation of the support structure, and at the same time, introduced the rotational misalignment collaborative deformation model to analyze the longitudinal deformation of the tunnel and the maximum displacement equivalent field of the tunnel caused by different support structure deformation methods. The theoretical analysis method can provide designers with prediction values quickly using prediction formulas, significantly enhancing the efficiency of predicting construction risks.…”

Section: Introductionmentioning

confidence: 99%

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Yin

2023

Applied Sciences

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Scholars often consider the deformation of a foundation pit retaining structure as a significant indicator of its stability. However, the current theoretical prediction formula for pit with pile–anchorretaining structure deformation is not yet perfect. This study utilizes a simplified spatial deformation model of a pile–anchorretaining structure and the principle of minimum potential energy to derive a prediction formula for the retaining structure’s spatial deformation. Afterwards, a numerical simulation model is developed based on actual engineering practices. On-site monitoring data is compared with the results of theoretical calculation formulas and numerical simulation models to validate their applicability. The research findings reveal minimal discrepancies between the theoretical calculation results, numerical simulation outcomes, and on-site monitoring data, indicating a high level of accuracy. Those three results follow consistent rules. The horizontal deformation curve of the crown beam exhibits a ‘V’-shaped distribution, and as the distance from the calculation point to the centerline of the foundation pit decreases, the horizontal deformation of the crown beam increases. The horizontal deformation curve of the pile displays a ‘V’-shaped distribution, and the pile’s horizontal deformation increases as the distance to the centerline of the foundation pit decreases. The research findings indicate that increasing the size and material strength of the crown beam and waist beam has only a limited effect on controlling the retaining structure’s deformation. However, by increasing the size and material strength of the pile, the deformation of the retaining structure can be significantly reduced.

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“…Tan et al [7,8] conducted a comparative analysis of four subway foundation pits in Shanghai, studying the effects of different construction methods and support conditions on the excavation of narrow and long foundation pits; they proposed that excessive excavation and excessive construction time would lead to a significant deflection of the underground continuous wall, and that the base and middle floors play leading roles in suppressing wall deformation and ground settlement after excavation. Zhao et al [9] studied complex deep excavations with different cross-sections and established a finite element model using midas GTS NX software. He believed that the horizontal deformation of subway tunnels is generally smaller than vertical deformation; tunnel monitoring should pay more attention to the development of vertical deformation in tunnels.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Application of T-Shaped Composite Pile Support System in Super-Large Foundation Pit Support Engineering

Lu,

Jiang

2023

Applied Sciences

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To reduce the impact of the one-time excavation of deep and large foundation pits on nearby subway tunnels, the excavation should be performed separately; thus, a T-shaped pile support system was studied. First, several foundation pit support structures were compared and selected, and a pile support system was proposed. In terms of space, a T-shaped support structure was formed to reduce the spatial requirements of the foundation pit. Through finite element software, a 1:1 restoration of the foundation pit using a T-shaped pile support system was carried out. The stress characteristics and support effect of the support structure were studied under two working conditions of symmetric and asymmetric excavation. The study found that there was a central effect on the foundation pit using a T-shaped pile support system, that is, the support piles farther away from the center of the T-shaped structure gradually increased the maximum pile bending moment and displacement owing to the constraints of vertical piles and the influence of the pit angle effect, respectively. In the case of symmetrical excavation, the T-shaped structure was simplified into a triangular structure, and the stress form of this type of structure could be reduced to a cantilever double-row pile structure, which met the requirements of pit excavation. The application of a T-shaped pile support structure can provide new design ideas for foundation pit engineering near regional subway lines.

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Numerical Study on the Deformation of Tunnels by Excavation of Foundation Pit Adjacent to the Subway

Cited by 22 publications

References 18 publications

Measurement and Analysis of Deformation of Underlying Tunnel Induced by Foundation Pit Excavation

Measurement and Analysis of Deformation of Underlying Tunnel Induced by Foundation Pit Excavation

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Numerical Simulation Study on Application of T-Shaped Composite Pile Support System in Super-Large Foundation Pit Support Engineering

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