Study on the Stability of a Transition Section from Soft to Hard Surrounding Rock Based on the Solid-Fluid Coupling Effect

Hu, Qizhi; Tang, Yi-Xin; Ding, Zhuoying

doi:10.1155/2020/6964151

Cited by 1 publication

(1 citation statement)

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“…So far, many scholars have conducted extensive research on the stability of tunnel excavation under seepage conditions. However, limited studies have focused on the coupling effect of fluid-solid interaction on the stability of tunnel excavations [8][9][10][11]. Ahmed et al [12], Atkinson et al [13], and Hisatake et al [14] described the failure modes of shield tunnel excavation using centrifuge model tests for tunnels in homogeneous sandy soil; they obtained the ultimate support pressure in the excavation face for a collapse in tunnels, but ignored the effect of the lining.…”

Section: Introductionmentioning

confidence: 99%

Stability on the Excavation Surface of Submarine Shield Tunnel Considering the Fluid–Solid Coupling Effect and the Equivalent Layer

Wang,

Li,

Zhu

et al. 2023

JMSE

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The support pressure on an excavation surface is a critical factor in the ground deformation and excavation stability of a submarine shield tunnel. The shield tail gap and the disturbance zone of grouting behind the tunnel wall are also important influencing factors. However, the effects of these factors on excavation stability are difficult to quantify. Consequently, a homogeneous, elastic, and annular equivalent layer is employed to simulate the thin layer behind the tunnel wall. Using COMSOL Multiphysics software, the effects of the water level depth, the thickness of the equivalent layer, the diameter of the shield tunnel, and the internal friction of soil and tunnel burial depth on the excavation deformation and ground surface subsidence of a submarine tunnel are considered with regard to the fluid–solid coupling effect. The result show that the surface subsidence of the case with respect to the fluid–solid coupling effect and the equivalent layer is larger than that without interstitial fluid and the equivalent layer, indicating that the present model can better simulate the stability of tunnel excavation. Therefore, it is important to consider the impact of the fluid–solid coupling effect and the equivalent layer on the deformation of the excavation face and ground surface subsidence.

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