A Review on Tunnel–Pile Interaction Applied by Physical Modeling

Sohaei, Houman; Namazi, Eshagh; Hajihassani, Mohsen; Marto, Aminaton

doi:10.1007/s10706-020-01240-6

Cited by 11 publications

(6 citation statements)

References 39 publications

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“…According to previous studies, the friction between the tempered glass panel and the sand was small, which could be neglected [16]. The tunnel model is made of PVC pipe with a diameter (D) of 15 cm, corresponding to a tunnel with an internal diameter of 6 m in the actual project [14,15]. The geometric similarity ratio is 1:40, and the relative burial depth C/D (C, cover) is set to 1.5, corresponding to a shallow urban buried tunnel.…”

Section: Model Set Upmentioning

confidence: 99%

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Model Test Study on the Response of Two Different Shallow-Foundation Framed Buildings under Tunnel Volume Loss

Liu,

Zhang,

Liu

et al. 2023

Buildings

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In order to study the influence of tunnel volume loss on adjacent framed buildings with different shallow foundations, this paper carried out physical model experiments with two common types of footings (isolated and strip footings) under different working conditions based on the digital image correlation (DIC) technique. The main finding of the present paper is that the increase in formation loss rate will aggravate the deformation and damage of the structure, and the strip foundation shows stronger integrity and stability compared with the isolated foundation in this process. With the increase in the eccentricity of the frames with respect to the tunnel, the overall tilt and damage degree of structural elements increases first and then decreases for both foundations, reaching the maximum value with the eccentric distance of one multiple of the tunnel diameter. Interestingly, when the isolated footings are located directly above the tunnel, the damage in the inner panels is the most severe and gradually decreases with eccentricity, changing from a sagging mode to a hogging mode for the frame form. While the strip footings always maintain slight hogging, and the trend of the damage degree of panels is similar to that of elements, with the eccentric distance reaching two times the tunnel diameter, the strip foundation structure tends to be stable, while the isolated one still needs attention for its potential possibility of damage in panels. The research results have reference value for the impact assessment of adjacent shallow-foundation framed buildings in subway tunnel construction.

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Section: Model Set Upmentioning

confidence: 99%

“…[9,10]. For now, the systematic study of the influence of the structure characteristics on ground displacement and structure deformation is still insufficient, and the effective evaluation of the impact of tunnel excavation on the formation and adjacent buildings is still an important challenge for the research community [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Model Test Study on the Response of Two Different Shallow-Foundation Framed Buildings under Tunnel Volume Loss

Liu,

Zhang,

Liu

et al. 2023

Buildings

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“…Excavating a tunnel close to a pile not only causes ground deformations but also can reduce the pile bearing capacity. Some researchers have used centrifuge tests or numerical analyzes to study the tunnel impact on the pile bearing capacity (Ng et al, 2001(Ng et al, , 2013Soomro et al, 2020;Sohaei et al, 2020;He et al, 2022). Pile bearing capacity is often inferred using settlement criteria, and pile settlements induced by tunnel excavation were correlated with the apparent loss of pile capacity (ALPC).…”

Section: Effect Of Volume Lossmentioning

confidence: 99%

“…Centrifuge modeling technique and model tests were also carried out to study the responses of single piles or piles groups subjected to tunneling. (Loganathan et al , 2000; Jacobsz et al , 2004; Ong et al , 2006; Chiang and Lee, 2007; Ng et al , 2013; Hong, 2015; Soomro et al , 2017, 2018; Leung et al , 2019; Sohaei et al , 2020; He et al , 2022). These experimental methods divulge some fundamental features of the problem.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional numerical analyses of pile responses to tunneling-induced ground movements in bilayer soil

Houhou

Amari

Belounar³

2022

WJE

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Purpose This paper aims to investigate the responses of single piles and pile groups due to tunneling-induced ground movements in a two-layered soil system. The analyses mainly focus on the additional single pile responses in terms of bending moment, lateral deflection, axial force, shaft resistance and pile settlement. Subsequently, a series of parametric studies were carried out to better understand the responses of single piles induced by tunneling. To give further understanding regarding the pile groups, a 2 × 2 pile group with two different pile head conditions, namely, free and capped, was considered. Design/methodology/approach Using the PLAXIS three-dimensional (3D) software, a full 3D numerical modeling is performed to investigate the effects of ground movements caused by tunneling on adjacent pile foundations. The numerical model was validated using centrifuge test data found in the literature. The relevance of the 3D model is also judged by comparison with the 2D plane strain model using the PLAXIS 2D code. Findings The numerical test results reveal that tunneling induces significant displacements and internal forces in nearby piles. The magnitude and distribution of internal forces depend mainly on the position of the pile toe relative to the tunnel depth and the distance between the pile and the vertical axis of the tunnel. As the volume loss increases from 1% to 3%, the apparent loss of pile capacity increases from 11% to 20%. By increasing the pile length from 0.5 to 1.5 times, the tunnel depth, the maximum pile settlement and lateral deflection decrease by about 63% and 18%, respectively. On the other hand, the maximum bending moment and axial load increase by about 7 and 13 times, respectively. When the pile is located at a distance of 2.5 times the tunnel diameter (Dt), the additional pile responses become insignificant. It was found that an increase in tunnel depth from 1.5Dt to 2.5Dt (with a pile length of 3Dt) increases the maximum lateral deflection by about 420%. Regarding the interaction between tunneling and group of piles, a positive group effect was observed with a significant reduction of the internal forces in rear piles. The maximum bending moment of the front piles was found to be higher than that of the rear piles by about 47%. Originality/value Soil is a complex material that shows differently in primary loading, unloading and reloading with stress-dependent stiffness. This general behavior was not possibly being accounted for in simple elastic perfectly plastic Mohr–Coulomb model which is often used to predict the behavior of soils. Thus, in the present study, the more advanced hardening soil model with small-strain stiffness (HSsmall) is used to model the non-linear stress–strain soil behavior. Moreover, unlike previous studies THAT are usually based on the assumption that the soil is homogeneous and using numerical methods by decoupled loadings under plane strain conditions; in this study, the pile responses have been exhaustively investigated in a two-layered soil system using a fully coupled 3D numerical analysis that takes into account the real interactions between tunneling and pile foundations. The paper presents a distinctive set of findings and insights that provide valuable guidance for the design and construction of shield tunnels passing through pile foundations.

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“…Owing to the rapid urbanization of China and exploration of underground space in many cities (Chiang and Lee, 2007;Lu et al, 2020;Lueprasert et al, 2017;Ng et al, 2013;Simic-Silva et al, 2020;Soomro et al, 2015;Soomro et al, 2017;Yoo, 2013). The construction of subway tunnels will inevitably affect the demand for safety and stability of adjacent building foundation structures along urban metro lines (Gokuldas et al, 2020;Liu et al, 2014;Ng and Lu, 2014;Sohaei et al, 2020;Wei, 2023;Wei et al, 2022). Fig.…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution for Evaluating the Responses of Existing Pile Caused by Adjacent Tunnel Excavation

Wei

2024

Preprint

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Tunnel excavation in short distance will change the physical equilibrium stress field of stratum and cause adverse effects on adjacent existing pile. A simplified analytical solution to calculate the horizontal displacement of existing pile under the influence of unloading in adjacent tunnel excavation is presented. First, consider that the existing pile is a Euler-Bernoulli beam resting on the Pasternak foundation model. Then, the free ground settlement of existing pile caused by a modified Loganathan’s formula during shield tunnel excavation is considered. The differential equation of lateral displacement of existing pile is established by combining the displacement coupling condition of tunnel-soil-pile foundation. Finally, the analytical solution of lateral displacement of pile caused by adjacent tunnelling is obtained by finite difference method. The reliability of the analytical solution is validated by comparing with boundary element program, finite element simulation and field measurement. Then, results of different factors such as tunnel buried depth, tunnel excavation radius, clearance distance between tunnel and pile on existing pile is analyzed. Through parameter analysis, the theoretical formula of maximum horizontal displacement of pile caused by tunnel excavation is put forward. The research content can provide theoretical verification for the investigation on the influence of adjacent tunnelling on deformation of existing pile.

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A Review on Tunnel–Pile Interaction Applied by Physical Modeling

Cited by 11 publications

References 39 publications

Model Test Study on the Response of Two Different Shallow-Foundation Framed Buildings under Tunnel Volume Loss

Model Test Study on the Response of Two Different Shallow-Foundation Framed Buildings under Tunnel Volume Loss

Three-dimensional numerical analyses of pile responses to tunneling-induced ground movements in bilayer soil

Analytical Solution for Evaluating the Responses of Existing Pile Caused by Adjacent Tunnel Excavation

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