Study on the Influence of Close Distance Construction of Urban Tunnel on the Existing Station

Yang, Zheng; Wu, Ke; Sun, Jie; Chen, Rong; Li, Yameng; Yang, Sigang

doi:10.1007/s10706-021-01790-3

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…Nevertheless, the maximum lateral displacement of the 2D analysis is overestimated by 25%. This difference may be due partly to the fact that tunneling is inherently a 3D problem (Migliazza et al , 2009; Houhou et al , 2016; Zheng et al , 2021; Hu et al , 2022), and partly to the numerical modeling method of the pile itself.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the TBM has been widely used in saturated soils to control surface settlement and risk of tunnel face failure, as well as to prevent seepage flow into the face by providing continuous support to the face during excavation. In practice, tunneling can be carried out with different tunnel boring techniques: open face TBM, slurry pressure balance (SPB), earth pressure balance and compressed-air TBM (Sepehrmanesh et al , 2014; Gokuldas et al , 2020; Zheng et al , 2021; Huang et al , 2022). In the current study, the SPB technique is used.…”

Section: Numerical Reference Model Used For the Parametric Analysesmentioning

confidence: 99%

“…The analyses of the induced soil movements and the response of the piles due to tunneling have been studied by various researchers using numerical methods by decoupled loadings in plane deformations. However, experimental studies have highlighted the limitations of the 2D approach, due to the restricted assumptions on which the formulations are based and have confirmed that the problem is three-dimensional (3D; Nematollahi and Dias, 2019; Gokuldas et al , 2020; Simic-Silva et al , 2020; Zheng et al , 2021; Hu et al , 2022). Thus, a full 3D coupled numerical analysis of the problem, which takes into account the real tunnel-soil-pile interactions, has become an important contribution to a thorough understanding of the observed phenomena.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Numerical Reference Model Used For the Parametric Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Houhou

Amari

Belounar³

2022

WJE

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“…As a connector between the new tunnel and the existing station, the intermediate soil significantly affects the settlement of the existing station. Zheng [33] reported that, when Qingdao underpasses the station, the intermediate soil is slightly weathered granite with a thickness of 4.45 m. The soil parameters were satisfactory, and the existing structural settlement was within a safe range. Zhao [34] found that the gravity load of intermediate soil is partially borne by its self-stability, whereas the remainder is borne by the lower pre-support.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the Intermediate Soil State and Settlement Control Measures during Tunnel Construction Undercrossing the Existing Station

Zhang

et al. 2023

Buildings

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Settlement control of existing stations has consistently been a key issue in tunnel construction. Intermediate soil has a significant influence on the settlement of the existing station as a connector between the new tunnel and the existing station which should be considered when selecting settlement control measures. To clarify the relationship between the state of the intermediate soil and the settlement and control measures of the existing station, this study investigated 49 new tunnel projects under existing stations and elucidated the relationship between the settlement and the settlement control measures of the existing station and the intermediate soil. The relationship between the failure of the intermediate soil and the settlement of the existing station was further analyzed by numerical simulation. Lastly, a simple mechanical model of intermediate soil failure was constructed to determine the stress state of the intermediate soil in constructing a tunnel under the existing station to guide the formulation of settlement control measures for the existing station. Hence, when the intermediate soil is completely destroyed, active control measures, such as jack or grouting lifting, should be implemented; when the intermediate soil is partially damaged, passive control measures should be undertaken. Thus, this study can provide a reference for settlement control of tunnels under existing stations.

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“…The interaction of tunnel-soil-existing structures is very complex, being related to many factors, such as the mechanical properties of soil layers [9,10], tunneling parameters [11], the distance between the tunnel and structures [12,13] and structural characteristics [14]. Some studies have used some empirical analysis methods to predict permanent ground subsidence caused by tunnel excavation to explore the impact of tunnel excavation on existing structures.…”

Section: Introductionmentioning

confidence: 99%

Study on the Performance of Twin Shield Tunnel Excavation below Existing Multi-Arch Culvert Bridge in Close Vicinity

Bao,

Shen

et al. 2023

Applied Sciences

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Various adjacent construction projects are inevitably encountered during the large-scale construction of urban underground transportation. The case of a twin shield tunnel excavated below an existing multi-arch culvert bridge in close vicinity has not yet been thoroughly studied. A case of a shield tunnel excavation below an existing multi-arch culvert bridge in Foshan is presented. First, a fully coupled three-dimensional model incorporating fluid and solid interactions was established to simulate the twin shield tunnel excavation below the existing multi-arch culvert bridge in close vicinity. Subsequently, the numerical model was validated using the modified Peck empirical formula. Finally, the influence of different foundation reinforcement deformation moduli, tunnel excavation face support pressures and grouting pressures on ground deformation was discussed. The results indicate that the area most significantly affected by the excavation of the tunnel passing underneath is not within the section of the multi-arch culvert bridge after applying the foundation reinforcement design. The area most significantly impacted is concentrated as the shield tunnel commences excavation and advances beneath the location corresponding to the 1-hole of the steel corrugated pipe. The range of influence of the ground disturbance extends approximately 7 m in front of the excavation face before the tunnel passed through. The range of ground disturbance decreases to 4–6 m in front of the excavation face after the tunnel passed through. The excavation face support pressure and grouting pressure have a minor impact on the settlement of the multi-arch culvert bridge under this reinforcement design. The results provide useful references for the reinforcement design for tunnel excavation adjacent to existing structures.

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Study on the Influence of Close Distance Construction of Urban Tunnel on the Existing Station

Cited by 4 publications

References 14 publications

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

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

Relationship between the Intermediate Soil State and Settlement Control Measures during Tunnel Construction Undercrossing the Existing Station

Study on the Performance of Twin Shield Tunnel Excavation below Existing Multi-Arch Culvert Bridge in Close Vicinity

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