Face stability analysis of large shield-driven tunnel in rock-soil interface composite formations

Ding, Xiaobin; Li, Kang; Xie, Yuxuan; Liu, Shuzhuo

doi:10.1016/j.undsp.2022.01.007

Cited by 15 publications

(7 citation statements)

References 31 publications

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“…Furthermore, the failure mechanism of tunnel face in soft upper-hard lower layers has been investigated by researchers through a combination of theoretical studies and experimental tests. The relevant theoretical models have been proposed, such as the logspiral model [40] and partial-wedge model [41], to predict the limit support pressure ratio of composite strata with various SAs, as shown in Figure 9. In this study, numerical sim- Furthermore, the failure mechanism of tunnel face in soft upper-hard lower layers has been investigated by researchers through a combination of theoretical studies and experimental tests.…”

Section: Overviewmentioning

confidence: 99%

“…(i) The failure only occurs in areas of the upper soft soil layer [40], and the geometric shape of the slip surface is a logarithmic spiral. (ii) The upper soft soil layer is considered to be homogeneous and isotropic, adhering strictly to the Mohr-Coulomb failure criterion on each failure surface.…”

Section: Overviewmentioning

confidence: 99%

“…Here are some basic assumptions for the TLSM: (i). The failure only occurs in areas of the upper soft soil layer [40], and the geometric shape of the slip surface is a logarithmic spiral. (ii).…”

Section: Overviewmentioning

confidence: 99%

“…The limit support pressure ratios obtained from the proposed model (TLSM), numerical simulation (NS), log-spiral model (LSM) [40], and partial-wedge model (PWM) [41] are shown in Figure 13. A general similarity can be observed in the trends of the changes in the four curves, with a gradual decrease in the limit support pressure ratio as SA reduces.…”

Section: Comparison and Analysismentioning

confidence: 99%

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Limit Equilibrium Models for Tunnel Face Stability in Composite Soft-Hard Strata

Zhang,

Song,

Yao

et al. 2023

Applied Sciences

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The tunnel face stability in composite strata, commonly referred to as the soft upper and hard lower condition, is a critical challenge in tunnel construction. The soft–hard ratio (SA) strongly influences the limit support pressure as well as the failure mechanism experienced by a tunnel face. This study focused on the Xingye Tunnel project in the Xiangzhou District of Zhuhai City. By conducting numerical simulations, the impact of different SAs on the limit support pressure was investigated. Furthermore, a limit equilibrium model was established on the basis of the analysis of the results of numerical simulation. The findings were then compared and analyzed alongside those of relevant theoretical models. In the event of tunnel face instability of composite strata, the deformation tends to be concentrated mainly in the soft soil layer, with less noticeable deformation in the hard rock layer. The investigation of different SAs revealed a linear decrease in the limit support pressure ratio of the tunnel face in composite strata as SA decreases. The self-stability of the tunnel face was observed when SA ≤ 0.125. Moreover, the limit support pressure ratio predicted by the truncated log-spiral model (TLSM) exhibited a higher degree of agreement with the results of numerical simulation than those of other relevant models. The superiority of TLSM was mainly demonstrated in the range of SA = 0.25 to 1.0.

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Section: Overviewmentioning

confidence: 99%

Section: Overviewmentioning

confidence: 99%

Section: Overviewmentioning

confidence: 99%

Section: Comparison and Analysismentioning

confidence: 99%

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Limit Equilibrium Models for Tunnel Face Stability in Composite Soft-Hard Strata

Zhang,

Song,

Yao

et al. 2023

Applied Sciences

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“…Simultaneously, the implementation of several tunnels can effectively augment traffic capacity in order to accommodate the escalating traffic demand between urban areas. The tunnel does not occupy spatial dimensions, impede navigation, or impact the natural environment, and serves as a secure and reliable all-weather conduit [5][6][7]. The construction of the tunnel has Buildings 2024, 14, 1356 2 of 15 the potential to facilitate regional economic development, enhance intercity connectivity and collaboration, and enhance the overall economic competitiveness of the region.…”

Section: Introductionmentioning

confidence: 99%

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

Huang,

Han

2024

Buildings

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The construction of multiple tunnels across inland rivers has had a significant influence on the improvement of the transportation infrastructure. The technology for constructing tunnels is progressing towards the development of larger cross-sections, longer distances, and the ability to withstand high hydraulic pressure in complex hydrogeological conditions, including high-permeability strata. In order to ensure the face stability of shield tunnels under high hydraulic pressure that crosses a fault fracture zone, it is necessary to study the progressive failure mechanism of shield tunnel faces induced by high hydraulic pressure seepage. This paper employs finite element numerical simulation software to methodically examine the variation in the characteristics of the water seepage field, limiting support force, and face stability failure mode of shield tunnels passing through fault fracture zones with high hydraulic pressure under varying fault fracture width zones. The results show that the formation hydraulic gradient will progressively widen when the tunnel face is located within the undisturbed rock mass and is advanced towards the area of fault fracture. This will raise the likelihood of instability in the shield tunnel and progressively raise the limiting support force on the tunnel face. Moreover, as the tunnel face nears the region of fault fracture within the undisturbed rock mass, the damage range increases gradually. In addition, due to the increase in seepage force, the angle between the failure area and the horizontal plane becomes more and more gentle. On the contrary, as the tunnel’s face moves closer to the undisturbed rock mass from the region of the fault fracture, the damage range gradually decreases, and the dip angle between the damage area and the horizontal plane becomes steeper and steeper due to the decreasing seepage force in the process. The study findings presented in this work are highly significant, both theoretically and practically, for the design and management of safety.

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Face Stability of Tunnel in Multi-stratum: Limit Analysis and Numerical Simulation

et al. 2023

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Face stability analysis of large shield-driven tunnel in rock-soil interface composite formations

Cited by 15 publications

References 31 publications

Limit Equilibrium Models for Tunnel Face Stability in Composite Soft-Hard Strata

Limit Equilibrium Models for Tunnel Face Stability in Composite Soft-Hard Strata

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

Face Stability of Tunnel in Multi-stratum: Limit Analysis and Numerical Simulation

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