A Simplified Analysis Method for the Deformation Response of an Existing Tunnel to Ground Surcharge Based on the Pasternak Model

Zheng, Wei Feng; Jiang, Yuqian

doi:10.3390/app11073255

Cited by 8 publications

(9 citation statements)

References 19 publications

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“…In the Eq (8), F M e is the magnitude of axial force applied to the i-th unit, which will cause compression deformation u i e of the unit. F Si e is the shear force of the i-th unit, which will cause the horizontal displacement v i e of the unit.…”

Section: Plos Onementioning

confidence: 99%

“…Deng, et al [ 7 ] derived a prediction formula for surface settlement and deformation of existing pipelines caused by shield tunneling along curved paths, analyzing the associated disturbances. Wei and Jiang [ 8 ] presents a simplified analytical solution for calculating the longitudinal displacement of existing tunnels that are subjected to adjacent surcharge loading. Based on the Boussinesq solution, the distribution of the additional load matrix caused by the surface surcharge on the existing tunnel was obtained.…”

Section: Introductionmentioning

confidence: 99%

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Calculation of additional load and deformation of the receiving well enclosure structure caused by shield tunneling

xin,

Chen,

et al. 2024

PLoS ONE

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The bulkhead additional thrust during shield tunneling, the force of friction between shield and soil, and the additional grouting pressure can cause additional stress in the surrounding soil, thereby disturbing existing buildings and structures. However, few studies focused on the disturbance situation when the shield tunneling machine approaches the receiving well. If the additional stress and deformation of the receiving well are too excessive, it could result in the collapse of the receiving well. Based on the two-stage method, this study derived the calculation formula of the additional stress and deformation of the receiving well enclosure structure caused by shield tunneling. Taking a shield machine receiving engineering as the context, this study established a numerical simulation model and compared theoretical calculation, the results of numerical simulation model and on-site monitoring data. Finally, the additional stress of the receiving well is analyzed. The research findings demonstrate that the theoretical prediction results, numerical simulation calculation results, and on-site monitoring data exhibit relatively small calculation errors, which validated the applicability of the theoretical prediction formula and numerical simulation model. As the distance between the shield machine and the receiving well decreases, the disturbance to the receiving well increases sharply. When the distance between the cutter head and the receiving well is less than three times the shield length, it is crucial to enhance the deformation monitoring of the receiving well. The primary factors affecting the additional load and deformation of the receiving well enclosure structure are the force of friction between shield and soil and the additional thrust of the cutterhead. The disturbance caused by the additional grouting pressure on the enclosure structure can be ignored.

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Section: Plos Onementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calculation of additional load and deformation of the receiving well enclosure structure caused by shield tunneling

xin,

Chen,

et al. 2024

PLoS ONE

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show abstract

Section: Introductionmentioning

confidence: 99%

“…Urban underground rail transit plays an important role in daily commuting due to its advantages of efficiency and convenience (Chen et al, 2015;Huang and Zhan, 2019;Wei and Jiang, 2021). 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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“…This affects adjacent structures' behaviors, with variables such as the relative density of the ground, groundwater level, structure type, and tunnel location. Tunneling in urban areas is essential to understand the interactive behavior of pile foundation and adjacent structures, and many studies have been carried out on this through closed form, numerical analysis [1][2][3][4], 1 g laboratory model testing [5], centrifuge model testing [6,7], and field monitoring [8][9][10]. Among foundation types of structure, the piled raft is more rational than the conventional pile foundation, which does not consider the supporting load of the raft.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Change Rate of Settlement for Piled Raft Due to Adjacent Tunneling Using Machine Learning

Kong

Lee

et al. 2021

Applied Sciences

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For tunneling in urban areas, understanding the interaction and behavior of tunnels and the foundation of adjacent structures is very important, and various studies have been conducted. Superstructures in urban areas are designed and constructed with piled rafts, which are more effective than the conventional piled foundation. However, the settlement of a piled raft induced by tunneling mostly focuses on raft settlement. In this study, therefore, raft and pile settlements were obtained through 3D numerical analysis, and the change rate of settlement along the pile length was calculated by linear assumption. Machine learning was utilized to develop prediction models for raft and pile settlement and change rate of settlement along the pile length due to tunneling. In addition, raft settlement in the laboratory model test was used for the verification of the prediction model of raft settlement, derived through machine learning. As a result, the change rate of settlement along the pile length was between 0.64 and −0.71. In addition, among features, horizontal offset pile tunnel had the greatest influence, and pile diameter and number had relatively little influence.

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A Simplified Analysis Method for the Deformation Response of an Existing Tunnel to Ground Surcharge Based on the Pasternak Model

Cited by 8 publications

References 19 publications

Calculation of additional load and deformation of the receiving well enclosure structure caused by shield tunneling

Calculation of additional load and deformation of the receiving well enclosure structure caused by shield tunneling

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

Prediction of Change Rate of Settlement for Piled Raft Due to Adjacent Tunneling Using Machine Learning

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