Behaviours of existing shield tunnels due to tunnelling underneath considering asymmetric ground settlements

Gan, Xiaolu; Yu, Jianlin; Gong, Xiaonan; Liu, Nianwu; Zheng, Dongzhu

doi:10.1016/j.undsp.2021.12.011

Cited by 25 publications

(12 citation statements)

References 47 publications

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“…Therefore, the articulation angle  of small radius curved tunnel can be solved by Eqs. (1), ( 3), ( 4), ( 7), (8), and (9). The articulation angle  is brought into Eq.…”

Section: Calculation Of Small Curvature Over-excavation and Articulat...mentioning

confidence: 99%

“…Exactly, the analytic method is a means of solving complex problems by using mathematical operations, which has the advantage of being both efficient and economical. There are four essential types of analytical methods for the disturbances in the surroundings induced by linear tunnel excavation, including complex variable solution [17,18,27], virtual image solution [29,41,49,54], stress function method in polar co-ordinate [9,19,25,26,36] and stochastic medium method [2,13,31,43]. In general, the above studies concluded that tunnel excavation generates soil gaps and loading effects, assuming soil recovery as a uniform or non-uniform radial movement.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of ground disturbance behavior during articulated shield tunneling on small radius curved routes in clays

Zhang,

Chen,

Zhang

et al. 2024

Preprint

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Current theoretical works on excavation-induced ground settlement in clays for small radius curve tunnels typically treat the shield as a continuous entity, neglecting the influence of the articulation device. Consequently, the accurate assessment of over-excavation effects resulting from changes in the small curvature shield excavation route is impossible. As regards the articulation and geometric relationship between the shield machine and tunnel excavation route, this paper develops formulae for calculating soil over-excavation amount and articulation angle at different positions during tunnel excavation. The clay soil settlement affected by multiple factors during the construction of an articulated shield is resolved via the mirror image method and Mindlin's solution, which takes into account articulation impacts. Additionally, the on-site monitoring data is utilized for comparison and verification with the proposed theoretical solution. It is demonstrated that the solution for small curvature excavation settlement involving the articulation effect achieves good conformance in predicting soil deformation. Finally, the parametric analyses are conducted to estimate the impact of the articulation device on the predicted ground settlement values in clay soil.

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“…Therefore, the articulation angle  of small radius curved tunnel can be solved by Eqs. (1), ( 3), ( 4), ( 7), (8), and (9). The articulation angle  is brought into Eq.…”

Section: Calculation Of Small Curvature Over-excavation and Articulat...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of ground disturbance behavior during articulated shield tunneling on small radius curved routes in clays

Zhang,

Chen,

Zhang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…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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“…Owing to their structural characteristics, existing shield tunnels are vulnerable to new tunnel construction underneath [1][2][3]. Because of the new tunnel undercrossing, longitudinal tunnel deformations may develop and threaten the safety and serviceability of the tunnel during long-term operation [4,5]. Therefore, the evaluation of tunneling-induced longitudinal deformations of existing shield tunnels has become a growing concern.…”

Section: Introductionmentioning

confidence: 99%

Random Responses of Shield Tunnel to New Tunnel Undercrossing Considering Spatial Variability of Soil Elastic Modulus

Gan,

Liu,

Bezuijen

et al. 2024

Applied Sciences

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This paper investigates the effect of spatial variability of soil elastic modulus on the longitudinal responses of the existing shield tunnel to the new tunnel undercrossing using a random two-stage analysis method (RTSAM). The Timoshenko–Winkler-based deterministic method considering longitudinal variation in the subgrade reaction coefficient and the random field of the soil elastic modulus discretized by the Karhunen–Loeve expansion method are combined to establish the RTSAM. Then, the proposed RTSAM is applied to carry out a random analysis based on an actual engineering case. Results show that the increases in the scale of fluctuation and the coefficient of variation of the soil elastic modulus lead to higher variabilities of tunnel responses. A decreasing pillar depth and mean value of the soil elastic modulus and an increasing skew angle strengthen the effect of the spatial variability of the soil elastic modulus on tunnel responses. The variabilities of tunnel responses under the random field of the soil elastic modulus are overestimated by the Euler–Bernoulli beam model. The results of this study provide references for the uncertainty analysis of the new tunneling-induced responses of the existing tunnel under the random field of soil properties.

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Behaviours of existing shield tunnels due to tunnelling underneath considering asymmetric ground settlements

Cited by 25 publications

References 47 publications

Evaluation of ground disturbance behavior during articulated shield tunneling on small radius curved routes in clays

Evaluation of ground disturbance behavior during articulated shield tunneling on small radius curved routes in clays

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

Random Responses of Shield Tunnel to New Tunnel Undercrossing Considering Spatial Variability of Soil Elastic Modulus

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