Safety Factor of Unsaturated Soil Slopes considering the Intermediate Principal Stress Effect and Different Profiles of Matric Suction

Li, Laurent; Changguang, Zhang; Zhao, Jingyuan; Qing, Yan

doi:10.1155/2021/6622522

Cited by 6 publications

(3 citation statements)

References 36 publications

(73 reference statements)

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“…When the soil is damaged, the higher the degree of the intermediate principal stress, the greater the soil strength will be. Previous research results [18][19][20][21] indicate that the strength criterion considering the effect of intermediate principal stress can better exert the strength characteristics of the rock and soil. For the practical project, proper strength criterion will exert the maximum resistance of soil and therefore be more economical.…”

Section: Ac-smp Strength Criterionmentioning

confidence: 99%

Earth Pressure of Three‐Dimensional Stress States under Different Strength Criteria and Its Application

Zhang

Jin

Fan

et al. 2021

Advances in Materials Science and Engineering

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To solve the Earth pressure problems in practical engineering, such as retaining walls and foundation pits, we derive active and passive Earth pressure formulas in accordance with the relationship between intermediate principal stress and excavation under three-dimensional stress states. The formulas are derived on the basis of the Mohr–Coulomb, spatially mobilized plane (SMP), σ 3 SMP, Lade–Duncan, axisymmetric compression- (AC-) SMP strength, and generalized Mises (Gen-Mises) criteria and then extended to clay. We also compare the calculated Earth pressure with the measured data. Results indicate that the Earth pressure considering medium principal stress contribution under a three-dimensional stress state is consistent with the actual engineering. The calculated active Earth pressure in the Mohr–Coulomb strength criterion is larger, and the passive Earth pressure is smaller than the practical one because the intermediate principal stress effect is not considered. The calculated results of the SMP, σ 3 SMP, Lade–Duncan, AC-SMP strength, and Gen-Mises criteria are close to the measured data, among which the result of the Gen-Mises criterion is closer. The Earth pressure calculated using the Lade–Duncan criterion is no longer appropriate to describe the Earth pressure under medium principal stress condition in this study. The results of this study have theoretical significance for retaining structure design under a three-dimensional stress state.

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Section: Ac-smp Strength Criterionmentioning

confidence: 99%

Earth Pressure of Three‐Dimensional Stress States under Different Strength Criteria and Its Application

Zhang

Jin

Fan

et al. 2021

Advances in Materials Science and Engineering

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“…Compared with the parameters of the artificial intelligence method and vague mathematical method, the SRM parameters have very clear physical significance [18,19]. However, current strength discount method mainly adopts Mohr-Coulomb strength criterion.…”

Section: Introductionmentioning

confidence: 99%

Ridge slope failure mode analysis using strength reduction method based on double shear unified strength criterion

Wang,

Liu,

et al. 2024

Preprint

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Intermediate principal stress (IPS) may influence the stability of a slope under three-dimensional (3D) failure modes. However, the influence of IPS is seldom considered in slope stability evaluation. In this study, the 3D stability and failure mode of a ridge slope is analyzed by considering the influence of IPS. The mathematical model of double-shear unified strength theory was established using the UMAT subroutine in the Abaqus software. The influence of IPS on the deformation and damage modes of the homogeneous ridge slope was studied using strength reduction method. The results calculated by the Mohr-Coulomb strength criterion were very close to those the unified strength UMAT subroutine. Both have a safety coefficient of approximately 1.6. When the IPS coefficient b was 0, the safety factor was 6.95. And when the IPS coefficient increased to 0.2, the stability factor of the double-sided ridge slope was 9.44. The slop stability was enhanced obviously due to the existence of the IPS. After the excavation of the ridge side slope, the rock mass of ridge slope was not failure easily at the ridge line of the double-sided ridge slope. However, the rock mass at the side of the flank was prone to cracking damage. Moreover, the rock mass was prone to extrusion failure at the foot of the double-sided ridge slope. The calculations provide a new method and knowledge on the concrete evaluation of the failure and stability of a slope.

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“…The stress state in many engineering applications is different from that usually considered in elastoplastic models under axisymmetric stress state conditions. Therefore, constitutive models to be used in the analyses of engineering problems such as foundations, earth dams, and embankments should take into account experimental information that comes from stress-strain tests in a generalized stress state (Nasreddine, 2004;Zerfa and Loret, 2003;Grammatikopoulou et al, 2007;Zhang et al, 2010;Zhang et al, 2016;Yao and Yang, 2017;Yan et al, 2020;Li et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Shear strength and yield surface of a partially saturated sandy silt under generalized stress states

2022

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This paper studies the hydromechanical behavior of a slightly compacted mixture of sand and clayey silt (30%/70%) under a generalized stress state. The experimental study focused on analyzing the yielding response and shear strength behavior at different stress states (characterized by the intermediate principal stress parameter b, or Lode angle) and at different initial total suctions (as-compacted state). For the investigation, a hollow cylinder apparatus was used. The shear strength results allowed defining the variation of the critical state line with the Lode angle and the suction. Different models were proposed for isotropic and anisotropic yield surfaces, and their shape and rotation were calibrated with experimental results. The modeled yield surfaces fitted reasonably well the experimental results, considering their inclination and dependence on the suction, mean and deviatoric stresses and Lode angle. In addition, some relationships between the stresses and the model parameters were proposed to normalize the yield surface equation.

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Safety Factor of Unsaturated Soil Slopes considering the Intermediate Principal Stress Effect and Different Profiles of Matric Suction

Cited by 6 publications

References 36 publications

Earth Pressure of Three‐Dimensional Stress States under Different Strength Criteria and Its Application

Earth Pressure of Three‐Dimensional Stress States under Different Strength Criteria and Its Application

Ridge slope failure mode analysis using strength reduction method based on double shear unified strength criterion

Shear strength and yield surface of a partially saturated sandy silt under generalized stress states

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