Role of Shear Deformability on the Response of Tunnels and Pipelines to Single and Twin Tunneling

Franza, Andrea; Viggiani, Giulia M. B.

doi:10.1061/(asce)gt.1943-5606.0002672

Cited by 15 publications

(4 citation statements)

References 27 publications

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“…Meanwhile, some investigations 40,41 have derived the analytical solution of the mechanical response of a Timoshenko beam resting on single or double parameters foundation model induced by the Fourier cosine series' additional stress. However, the three parameters Kerr foundation model, which can provide in the determination of the level of strain "continuity" in the boundary between the loading and unloading ground surfaces, 36 is not considered to simulate tunnelsoil interaction.…”

Section: Introductionmentioning

confidence: 99%

Simplified method for evaluating tunnel response induced by a new tunnel excavation underneath

Feng,

Xu,

Ding

et al. 2024

Num Anal Meth Geomechanics

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To estimate the tunnel response induced by a new tunnel excavation underneath, theoretical solutions are proposed in this study. The overlying tunnel is idealized as an infinite Timoshenko beam resting on the Kerr foundation model, then the vertical force balance equation is established. The unloading stress can be expressed as Fourier cosine series and a theoretical solution can be derived. The effectiveness of the proposed method is verified by a centrifuge test and an actual field measurement, which are extracted from previous investigations. Calculation results from the proposed method show good accord to centrifuge test results and field‐measured data. Meantime the predictions given by the proposed method are more accurate to estimate tunnel response compared with the previous method. Parametric analysis indicates that the volume loss ratio and the vertical clearance between two tunnels, are both significantly alleviate the tunnel response, but the effect of tunnel shear stiffness is slight. The theoretical solutions can be adopted to predict the overlying tunnel response induced by tunneling underneath in real projects.

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Section: Introductionmentioning

confidence: 99%

Simplified method for evaluating tunnel response induced by a new tunnel excavation underneath

Feng,

Xu,

Ding

et al. 2024

Num Anal Meth Geomechanics

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show abstract

“…Zhang et al [19] proposed an analytical method based on Timoshenko beam theory and a Kerr foundation model for new tunnel construction underneath and perpendicular to the existing shield tunnels. Franza et al [20] used a Timoshenko beam-based elastic-continuum model to assess the longitudinal responses of existing tunnels to single and twin tunneling.…”

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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“…In addition, Kong et al analytically investigated the effect of double tunnel distance on the surface settlement trough curve, which can provide guidance for the double tunnel design process. Franza et al 6 investigated the role of shear deformation capacity on the response of single- and double-hole tunnels. They implemented an equivalent Timucinco beam based on a soil-structure interaction model of the continuum for assessing the settlement and longitudinal deformation induced by excavation of existing tunnels and pipelines.…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of excavation sequence of three-hole shield tunnel on surface settlement and segment deformation

Wang,

Dai,

Ding

et al. 2023

Sci Rep

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In order to study the influence of excavation sequence of three-hole parallel shield tunnel on surface settlement and segment convergence, an improved “three-stage analysis method” was proposed to calculate the surface settlement of three-hole parallel shield tunnel. Based on Peck's existing theory, this method deduced the ground settlement formula under the three-hole parallel condition, and can calculate the ground settlement more accurately. Based on the engineering background of a shield tunnel section in Jiangsu Province, a three-dimensional model of a three-hole parallel shield tunnel was established by using Flac3d software, and the three-hole parallel shield tunnel was simulated under four working conditions: right–center–left, right–left–center, right–left–right and right–center (reverse)–left. This paper analyzed the influence of tunnel excavation sequence on surface settlement, soil displacement and deformation of tunnel segments. The construction sequence was optimized based on the above influencing factors. It was found that Case 4, S-type sequential excavation, produced the least ground settlement. The surface settlement value caused by S-type excavation sequence was only 11.41 mm, and the convergence value of the segments generated by S-type excavation sequence was relatively small. Considering the economic factors such as construction efficiency and benefit, the S-shaped excavation sequence was better. The new calculation method of tunnel surface settlement and the optimal sequence of tunnel construction proposed in this paper can provide reference for actual construction.

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Role of Shear Deformability on the Response of Tunnels and Pipelines to Single and Twin Tunneling

Cited by 15 publications

References 27 publications

Simplified method for evaluating tunnel response induced by a new tunnel excavation underneath

Simplified method for evaluating tunnel response induced by a new tunnel excavation underneath

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

Study on the effect of excavation sequence of three-hole shield tunnel on surface settlement and segment deformation

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