Failure Mechanism of the Bearing Stratum at the End of a Pile Induced by Shield Tunnel Excavation Beneath a Piled Building

Huang, Fu; Wang, Ziqin; Zhang, Min; Li, Siyuan

doi:10.1007/s12205-021-0557-0

Cited by 6 publications

(3 citation statements)

References 29 publications

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“…In the case of U-shaped tunnels, the conformal mapping method can project them onto the unit circle, and then an analytical solution for the impact of U-shaped tunnel excavation on adjacent pile foundations can be derived by integrating the complex function method and load transfer method [13]. The analytical equation for the failure surface of the upper pile foundation's end-bearing layer resulting from tunnel excavation can be derived using the variational principle [14]. Given the convenience and cost-effectiveness of the finite element method, numerous studies on the impacts of tunnel excavation on nearby existing pile foundations were conducted through this method [15,16].…”

Section: Introductionmentioning

confidence: 99%

A Simplified Method for the Stress Analysis of Underground Transfer Structures Crossing Multiple Subway Tunnels

Yan,

Geng,

Dai

et al. 2024

CMES

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According to the design specifications, the construction of extended piles involves traversing the tunnel's upper region and extending to the underlying rock layer. To address this challenge, a subterranean transfer structure spanning multiple subway tunnels was proposed. Deliberating on the function of piles in the transfer structure as springs with axial and bending stiffness, and taking into account the force balance and deformation coordination conditions of beams and plates within the transfer structure, we established a simplified mechanical model that incorporates soil stratification by combining it with the Winkler elastic foundation beam model. The resolved established simplified mechanical model employed finite difference technology and the Newton-Simpson method, elucidating the mechanical mechanism of the transfer structure. The research findings suggest that the load carried by the upper structural columns can be transferred to the pile foundation beneath the beams through the transfer structure, subsequently reaching the deep soil layer and ensuring minimal impact on adjacent tunnels. The established simplified analysis method can be used for stress analysis of the transfer structure, concurrently considering soil stratification, pile foundation behavior, and plate action. The pile length, pile section size, and beam section size within the transfer structure should account for the characteristics of the upper load, ensuring an even distribution of the beam bending moment.

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Section: Introductionmentioning

confidence: 99%

A Simplified Method for the Stress Analysis of Underground Transfer Structures Crossing Multiple Subway Tunnels

Yan,

Geng,

Dai

et al. 2024

CMES

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“…Due to the convenience and efficiency of metro lines, increasingly more cities are planning and constructing new metro lines. Therefore, traversing of a new tunnel traverses around existing structures is becoming common, resulting in the formation of a structural system including tunnels, underground stations, building foundations, and so on (Chen et al, 2016; Guo, 2011; Huang et al, 2021; Li et al, 2022; Liang et al, 2016; Liu, Fang, et al, 2022; Marshall et al, 2010; Meng et al, 2022; Shi et al, 2015; Zhang et al, 2018). However, considering the high density of population and architectures in the urban area, the effect arising from new tunnels on the existing structure needs to be controlled below a certain level; otherwise, there may be irreversible deformation and damage to the existing structure in the form of cracks and leakage.…”

Section: Introductionmentioning

confidence: 99%

Mechanical responses of underground carriageway structures due to construction of metro tunnels beneath the existing structure: A case study

Han,

Ye,

Han

et al. 2023

Deep Underground Science and Engineering

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To understand the mechanical response pattern of the existing structure and ground due to the construction of metro tunnels underneath, the finite difference method is adopted to study the torsional deformation and stress variation of the existing structure and the effect of underground carriageway structures on the surface subsidence. The curves of the maximum differential subsidence, torsion angle, and distortion of the cross‐section of the existing structure show two peaks in succession during traversing of two metro tunnels beneath it. The torsion angle of the existing structure changes when the two tunnels traverse beneath it in opposite directions. The first traversing of the shield tunnel mainly induces the magnitude variation in torsional deformation of the existing structure, but the second traversing of the subsurface tunnel may cause a dynamic change in the magnitude and form of torsional deformation in the existing structure. The shielding effect can reduce the surface subsidence caused by metro tunnel excavation to a certain extent, and the development trend of subsidence becomes slower as the excavation continues.

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“…In recent decades, urban underground tunnel development has been in full swing, and issues with tunnel excavation near to structures are not uncommon. Scholars have carried out large numbers of studies on such problems [1][2][3][4][5][6]. As for the impact evaluation of shield tunnel construction adjacent to pile foundation, researchers have conducted in-depth research based on theoretical analysis [7][8][9][10], on-site monitoring [11][12][13], model tests [14][15][16], and numerical simulations [17,18].…”

Section: Introductionmentioning

confidence: 99%

Soil Heterogeneity Effects on Bridge Piles Deformation under Shield Tunnelling Disturbance

Chen

Guo

Ma³

et al. 2022

Sustainability

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This research examines the impact of soil heterogeneity on the bridge piles beneath a nearby tunnel excavation using Monte-Carlo stochastic analysis. Sensitivity analysis is specifically used to the variation of stratum range, variation coefficient (COV), and fluctuation distance of the soil Young’s modulus. Meanwhile, the reliability evaluation approach is also applied to systematically examine the impact of COV on the likelihood of a pile failing. The findings suggest that more consideration should be given to the degree and range of geological parameter variations in the strata surrounding the tunnel. The horizontal and vertical fluctuation distances in this project are predicted to be around 18 m and 4.5 m, respectively. The fluctuation range influences the frequency of low stiffness zones in the soil. Additionally, the variation coefficient has a significant effect on the pile deformation, presenting a positive association. The pile deformation exhibits an increasing tendency in the wake of the growing variation coefficient. More significantly, the increase of the COV will directly lead to a rising failure probability of the pile settlement. According to extensive Monte-Carlo simulation calculations, the simulation results considering the variability of soil parameters have a certain deviation from the deterministic in the perspective of probability statistics. It is quite necessary to attach importance to the soil heterogeneity effects in the pile foundation stability under construction disturbance.

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Failure Mechanism of the Bearing Stratum at the End of a Pile Induced by Shield Tunnel Excavation Beneath a Piled Building

Cited by 6 publications

References 29 publications

A Simplified Method for the Stress Analysis of Underground Transfer Structures Crossing Multiple Subway Tunnels

A Simplified Method for the Stress Analysis of Underground Transfer Structures Crossing Multiple Subway Tunnels

Mechanical responses of underground carriageway structures due to construction of metro tunnels beneath the existing structure: A case study

Soil Heterogeneity Effects on Bridge Piles Deformation under Shield Tunnelling Disturbance

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