Upper bound analysis for estimation of the influence of seepage on tunnel face stability in layered soils

Liu, Wei; Albers, Bettina; Zhao, Yu; Tang, Xiaowu

doi:10.1631/jzus.a1500233

Cited by 17 publications

(4 citation statements)

References 27 publications

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“…To evaluate the influence of the seepage forces on the tunnel face stability, the key lies in the reasonably accurate estimations of hydraulic head ahead and hydraulic gradient around the tunnel face. In general, the seepage pressures acting on the tunnel face could be calculated via a numerical simulation [1,16] or approximate formula [14,20,22,23].…”

Section: Overview Of Calculation Of a Hydraulic Gradient Around The Tmentioning

confidence: 99%

“…According to the plastic strain distribution in the collapse state obtained by finite element simulation, Lu et al [19] proposed a 2D upper bound analysis to calculate the limit support pressure of the tunnel face. Liu et al [20] adopted a 3D conical mechanism model to investigate the influence of seepage on tunnel face stability.…”

Section: Introductionmentioning

confidence: 99%

“…,c-constants determined by curve fitting to the numerical results r-radius of the tunnel face Liu et al[20] …”

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confidence: 99%

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Calculation of Limit Support Pressure for EPB Shield Tunnel Face in Water-Rich Sand

et al. 2019

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With the rapid development of the tunnels constructed under the rivers and seas, the research on face stability of shield tunnel in water-rich sand has important theoretical value and engineering application significance. In addition to the loads exerted by overlaying strata, the tunnels constructed in water-rich strata are usually subjected to high hydrostatic pressure or seepage forces, which are apt to cause the ground collapse of the shield tunnel face. The distribution of hydraulic head field around the tunnel face is critical to assess the impacts of the seepage forces on the tunnel face stability. This paper investigates the axisymmetric problem of the face stability of the shield tunnel under a seepage condition within the framework of limit equilibrium analysis. First, numerical simulations are carried out in this paper to analyze the distribution rules of total hydraulic head and pore water pressure near the tunnel face of the shield tunnel under the condition of stable seepage with different cover depths. Then, based on the distribution rules of total hydraulic head, new formulas for predicting the total hydraulic head along the horizontal and vertical directions are proposed and compared with the numerical simulations in this paper and existing approximate analytical solutions. Second, the classical axisymmetric limit equilibrium model is revised by incorporating the new approximate analytical solutions of hydraulic head field to determine the failure modes and the limit support pressures with a numerical optimization procedure. Lastly, the comparisons of the results obtained from the theoretical analysis model in this paper and the existing approaches are conducted, which shows that the failure mechanism proposed in this paper could provide relatively satisfactory results for the limit support pressures applied to the tunnel face.

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Section: Overview Of Calculation Of a Hydraulic Gradient Around The Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Calculation of Limit Support Pressure for EPB Shield Tunnel Face in Water-Rich Sand

et al. 2019

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“…There exist publications of the analytical continuous upper bound limit analysis method for shield tunnel stability problems, such as Osman et al [1][2], Klar et al [3], Mollon et al [4], Klar and Klein [5], Xiang and Song [6], Zhang et al [7], Huang et al [8], Song and Xiang [9], Xiang and Song [10], however, none of them and other analytical continuous upper bound limit analysis developments in the existent literature has taken into consideration of groundwater seepage effect. In contrast, the limit equilibrium method and the rigid body upper bound limit analysis method have been widely developed with pore water effect, such as Anagnostou and Kovári [11], Lee et al [12], Anagnostou [13], and Perazzelli [14], for the former, and Lee et al [15], Park et al [16], Huang et al [17][18][19], Xie et al [20], Pan and Dias [21], Liu et al [22], and Sun et al [23], for the latter.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction

Song

Xiang

2020

E3S Web Conf.

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An analytical continuous upper bound limit analysis is developed to analyse the effects of seepage on the transverse stability of underwater shield tunnels. The approach is based on an analytical continuous upper bound limit analysis method for cohesive-frictional soils. It employs the complex variables solution of the displacement field due to tunnel deformation and movement, and the analytical solution of the pore water pressure field for steady state seepage due to pore water influx at the tunnel perimeter. The most critical slip line position and the minimum required tunnel support pressure are determined by using a particle swarm optimization scheme for various generic situations. The method is verified via finite element simulation and comparison with the solution from using rigid block upper bound limit analysis. The parametric analysis revealed among other things that both the infimum of the necessary tunnel support pressure and the most critical plastic zone increase when the hydraulic head at the ground surface increases, but decrease when the tunnel influx increases due to the fact that pore water pressure at the tunnel perimeter decreases with the tunnel influx.

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An analytical model for face stability of tunnels traversing the fault fracture zone with high hydraulic pressure

Han

Wang

et al. 2021

Computers and Geotechnics

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Upper bound analysis for estimation of the influence of seepage on tunnel face stability in layered soils

Cited by 17 publications

References 27 publications

Calculation of Limit Support Pressure for EPB Shield Tunnel Face in Water-Rich Sand

Calculation of Limit Support Pressure for EPB Shield Tunnel Face in Water-Rich Sand

An Analytical Continuous Upper Bound Limit Analysis of Pore Water Effect on the Tail Stability of Underwater Shield Tunnels during Construction

An analytical model for face stability of tunnels traversing the fault fracture zone with high hydraulic pressure

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