Three-Dimensional Face Stability of Tunnels in Unsaturated Soils with Nonlinear Soil Strength

Hou, Chuantan; Yang, Xiaoli

doi:10.1061/(asce)gm.1943-5622.0001916

Cited by 8 publications

(2 citation statements)

References 39 publications

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“…Furthermore, the soil is often in an unsaturated state due to the influence of matric suction. The strength properties in unsaturated soils differ significantly from those in saturated soils [4][5][6]. Hence, a series of innovative works have been introduced within the academic community to tackle the characteristics of unsaturated soils [7].…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Three-Dimensional Tunnel Face Considering Linear and Nonlinear Strength in Unsaturated Soil

Yang,

Liao,

Zhu

2024

Applied Sciences

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The shear strength of unsaturated soils exhibits significant nonlinearity, while previous studies often simplified it with linear strength models. The objective of this paper is to investigate the distinctions in the stability of three-dimensional (3D) tunnel faces when using linear and nonlinear strength models. A new 3D rotational failure mechanism and an extended form of the Mohr–Coulomb (M-C) failure criterion were integrated into the kinematically limited analysis (KLA) framework to describe the failure characteristics of tunnel faces. Subsequently, the factor of safety (FS) of the 3D tunnel faces was calculated using the strength reduction method (SRM). In the discussion section, the impacts of nonlinear shear strength, matric suction in the unsaturated soils, and the 3D geometric parameters of the tunnel on the stability of the tunnel face were analyzed. The outcomes indicate that, in unsaturated soil conditions, diverse nonlinear strength calculation models and soil types exert disparate influences on the FS of 3D tunnel faces. The main novelty of this study lies in establishing an effective method for assessing the stability of tunnel faces in unsaturated soils.

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Section: Introductionmentioning

confidence: 99%

Stability Analysis of Three-Dimensional Tunnel Face Considering Linear and Nonlinear Strength in Unsaturated Soil

Yang,

Liao,

Zhu

2024

Applied Sciences

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“…In the excavation of tunnels and underground cavities, the stability and safety of excavation faces are important prerequisites for the smooth penetration and timely delivery of the tunnel. Numerous contributions have been made to predict the required support pressure and to ensure safety by various methods [1,2], such as the limit equilibrium method [3][4][5][6], numerical simulation [7][8][9], limit analysis method, and their combinations [10][11][12][13]. Compared with the limit analysis method, the limit equilibrium method, as a classic theoretical method, solves the stability problems from the viewpoint of static equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Seismic Stability Analysis of Tunnel Faces in Heterogeneous and Anisotropic Soils Using Modified Pseudodynamic Method

2023

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This work assesses the seismic stability of tunnel faces advanced in heterogeneous and anisotropic soils based on the plastic limit theorem. A discretized kinematic velocity field respecting the normal flow rule is generated via a point-to-point discretization technique. The distribution of soil parameters in the depth direction including cohesion, friction angle, and unit weight are considered by four kinds of profiles. The variation in cohesion with shear direction caused by consolidation and sedimentation is considered by including an anisotropy coefficient. The seismic acceleration is represented by the modified pseudodynamic method (MPD) rather than the conventional pseudodynamic method (CPD). Based on the energy equilibrium equation, an upper-bound solution is derived. The accuracy and rationality of the proposed procedure are substantiated by comparing with the solutions obtained by conventional log-spiral mechanism and CPD. A parametric study indicates that nonlinear profiles tend to predict a smaller required face pressure than the constant and linear profiles due to the convexity of nonlinear profiles. The over-consolidated soil is more sensitive to the anisotropy coefficient than normally consolidated soil. Moreover, the adverse effect of horizontal seismic acceleration is much greater than that of vertical acceleration, and the resonance effect is more prone to happen, especially for shallow-buried tunnels.

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Three-dimensional tunnel face stability considering the steady-state seepage in saturated and unsaturated regions with changing water levels

Hou

Zhang

Yang

2022

Computers and Geotechnics

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Three-Dimensional Face Stability of Tunnels in Unsaturated Soils with Nonlinear Soil Strength

Cited by 8 publications

References 39 publications

Stability Analysis of Three-Dimensional Tunnel Face Considering Linear and Nonlinear Strength in Unsaturated Soil

Stability Analysis of Three-Dimensional Tunnel Face Considering Linear and Nonlinear Strength in Unsaturated Soil

Seismic Stability Analysis of Tunnel Faces in Heterogeneous and Anisotropic Soils Using Modified Pseudodynamic Method

Three-dimensional tunnel face stability considering the steady-state seepage in saturated and unsaturated regions with changing water levels

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