Transverse Force Analysis of Adjacent Shield Tunnel Caused by Foundation Pit Excavation Considering Deformation of Retaining Structures

Zhang, Xinhai; Wei, Gang; Lin, Xiaoyan; Xia, Chang; Wei, Xinjiang

doi:10.3390/sym13081478

Cited by 15 publications

(5 citation statements)

References 15 publications

(26 reference statements)

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“…The unequal displacement of the upright column would result in the differential displacement of the supporting system on the vertical plane and the plane, which would ultimately result in the secondary stress of the supporting axial force [27][28][29][30]. If there was a significant settlement between the upright column and the retaining wall or between the upright column and the retaining wall, it would result in eccentric compression or even instability of the supporting system, thereby causing an engineering accident; therefore, the vertical displacement of the column was crucial to the stability of the foundation pit enclosure system.…”

Section: Analysis Of Upright Column Simulation Resultsmentioning

confidence: 99%

Numerical Simulation and Field Monitoring Analysis for Deep Foundation Pit Construction of Subway Station

Zhang¹,

Zhu²

2022

Structural Durability &Amp; Health Monitoring

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To investigate the effect of deep foundation pit excavation on the stability of retaining structure, a subway station in the city of Jinan was selected as a project, and a FLAC3D-based three dimensional model was developed for numerical simulation. The horizontal displacement of the retaining structure, the axial force of the support, and the vertical displacement of the column were studied and compared to the collected data from the field. The findings indicate that when the foundation pit is excavated, the maximum deformation of the retaining structure progressively decreases from the top, the distortion of the retaining structure gradually rises, and the final maximum deformation is around 17 meters deep. In each layer of support, the largest axial force support is located in the first reinforced concrete support; the uplift of the pit bottom caused by soil unloading plays a primary role in the vertical displacement of the column, and the column exhibits an upward trend under all construction conditions. When compared to the measured data, the generated findings are comparable and the fluctuation trend is extremely consistent. The findings of this article may give technical direction for the development of subway stations with a comparable engineering basis.

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Section: Analysis Of Upright Column Simulation Resultsmentioning

confidence: 99%

Numerical Simulation and Field Monitoring Analysis for Deep Foundation Pit Construction of Subway Station

Zhang¹,

Zhu²

2022

Structural Durability &Amp; Health Monitoring

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“…Nevertheless, the construction process frequently encounters a challenge of adjacent foundation pits due to the scarcity of available land in urban areas [19]. Xinhai Zhang [20] et al considered factors such as deformation of the foundation pit support structure, distance between the tunnel and the foundation pit, and excavation depth of the foundation pit. They analyzed the confining pressure of the adjacent shield tunnel, the values of bending moment and shear force, and the axial force at the top and bottom of the tunnel's segment ring.…”

Section: Introductionmentioning

confidence: 99%

Ground settlement and estimation of maximum settlement value in adjacent foundation pit excavation

2024

Archives of Civil Engineering

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The excavation of adjacent pits following the initial foundation pit excavation can significantly influence ground settlement. Using a foundation pit excavation project in Changzhou as a prototype, this study employed the numerical simulation method in conjunction with the HSS model to analyze the settlement deformation characteristics of the original excavation and compare them with the recorded monitoring values. In this study, the analysis focused on the ground settlement between two pits by varying the spacing between them at different excavation depths. The findings revealed that the ground settlement does not exhibit a significant increase when the new pit is excavated at a shallow depth. However, it rapidly increases when the excavation depth of the new pit surpasses that of the existing pit. Furthermore, an increase in the distance between the two pits causes the maximum settlement position to shift towards the edge of the new pit. The maximum ground settlement is found to have a linear relationship with both the maximum horizontal displacement of the two pits and the spacing between them.

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“…Pile-anchor systems are highly effective in controlling the deformation of large-scale excavations, while multi-level support systems can provide uniform support at different depths, and by optimizing the arrangement and timing of support layers, the overall soil deformation can be minimized [18,22]. Through numerical simulations and model experiments, comprehensive studies of key parameters such as soil deformation, stress distribution during pit excavation, displacement, shear forces, and moments of rail transit structures have been conducted [23][24][25]. For example, based on numerical simulations, Liao et al found that subway stations adjacent to deep excavations experience rotational and shear effects, potentially leading to structural fatigue and reduced safety [26].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on the Impact of Deep Foundation Pit Excavation on Adjacent Rail Transit Structures—A Case Study

Huang,

Liu,

Guo

et al. 2024

Buildings

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Excavation in foundation pits can result in serious issues for nearby tunnel structures like deformation, differential settlement, and seepage damage, which profoundly impact project timelines and potentially endanger life and property safety. Therefore, it is imperative to investigate these impacts before and after construction and to facilitate timely adjustments of construction measures and reinforcement where possible. In this study, a foundation pit construction project near a rail transit line is employed as a case to comprehensive study the impact of on-site deep foundation pit excavation on adjacent rail transit structures by numerical simulation. A three-dimensional finite-element model of the foundation pit based on site geological characteristics and construction procedures is established to study the excavation and maintenance processes. Through analysis of key parameters including soil deformation, displacement, shear force, and bending moment of the tunnel structures, the designed protective structure is found to have effectively mitigated soil deformation, ensuring the stability of the foundation pit. As excavation progresses, lateral soil deformation and vertical uplift gradually increase but remain within specified control values. During various excavation stages, the maximum displacement of the tunnel structure gradually increases, with the increase rates of maximum settlement being 29.09%, 20.51%, and 6.45%, respectively. This indicates a gradual enhancement of the stability of the tunnel structure. Additionally, excavation of the foundation pit has a significant impact on the bending moment distribution of the tunnel structure but does not affect the axial force and shear force of the tunnel structure. The findings of this study offer crucial scientific insights for evaluating the safety and stability of construction near tunnel structures.

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Transverse Force Analysis of Adjacent Shield Tunnel Caused by Foundation Pit Excavation Considering Deformation of Retaining Structures

Cited by 15 publications

References 15 publications

Numerical Simulation and Field Monitoring Analysis for Deep Foundation Pit Construction of Subway Station

Numerical Simulation and Field Monitoring Analysis for Deep Foundation Pit Construction of Subway Station

Ground settlement and estimation of maximum settlement value in adjacent foundation pit excavation

Numerical Simulation Study on the Impact of Deep Foundation Pit Excavation on Adjacent Rail Transit Structures—A Case Study

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