Determination of Mohr–Coulomb Parameters from Nonlinear Strength Criteria for 3D Slopes

Wu, Di; Wang, Yuke; Qiu, Yue; Zhang, Juan; Wan, Yukuai

doi:10.1155/2019/6927654

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…The numerical simulation of the slope was developed using the Rocscience Slide2 program version 6.020 [17]. The Mohr-Coulomb criteria were used in the numerical simulation of the slope as the shear strength of soil and rock can be defined by cohesion and friction angle [18].…”

Section: Model Preparationmentioning

confidence: 99%

Analysis of Maximum Economic Length of Soil Nail for Slope Stability

Pathak

2023

JEMT

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Slope stability is of utmost importance in geotechnical engineering, necessitating effective reinforcement methods to mitigate failures. This study examined the advantages, limitations, and overall suitability of soil nails and cable anchors in stabilizing slopes. Numerical modeling and analysis were performed using the Rocscience Slide2 program. The study analyzed soil nails and cable anchors for slopes of 10 m to 60 m height, slope angle from 35° to 90°, and friction angle from 27° to 36°. The findings reveal that the maximum economic length of soil nails decreases as slip surface depth, slope height, and slope angle increase. Additionally, the friction angle of the soil has a negligible effect on the maximum economic length of the soil nail.

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Section: Model Preparationmentioning

confidence: 99%

Analysis of Maximum Economic Length of Soil Nail for Slope Stability

Pathak

2023

JEMT

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“…Weaker materials will often be represented using a linear Mohr-Coulomb strength envelope. However, laboratory testing and the literature indicate that soil strength envelopes are often non-linear (Fredlund et al 1987;Gao et al 2015;Atkinson 2017;Wu et al 2019), especially under low confining stresses. Failure criterion for rocks, such as the Hoek-Brown criterion (Hoek et al 2002) are non-linear.…”

Section: Introductionmentioning

confidence: 99%

Selection of appropriate strength envelopes for open pit slope stability analyses in soils and weak rocks

Wines,

Zhang,

van Rensburg

et al. 2023

SSIM 2023: Third International Slope Stability in Mining Conference

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Soils and weak rocks are often encountered in the upper benches of open pit mines. The exposure depth of these materials is often insignificant and therefore limited effort may be committed to their characterisation and analysis. For example, these materials may be represented using a simple linear Mohr-Coulomb model with the properties based on limited testing data. However, observations of soil and weak rock behaviour (including laboratory testing) indicate that the strength envelopes are often non-linear. When deeper exposures of these relatively weak materials are encountered, providing a more rigorous numerical representation of their expected behaviour may be important to the safety and economic viability of an operation.Compared to linear strength envelopes, non-linear strength envelopes can provide an improved understanding of the expected behaviour of soils and weak rocks. In this paper, numerical analyses were used to illustrate the difference in slope stability analysis results obtained using linear and non-linear strength envelopes. The paper also discussed case studies from three different open pit mines where non-linear strength envelopes provided more plausible and realistic representations of observed slope behaviour.

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“…Fitting scatter is attributed to heterogeneity in the rock specimens and anisotropy. Some authors noticed the importance of determining the value of cohesion in order to apply the Mohr-Coulomb model to different types of concrete and used cohesion parameters to describe the concrete softening/hardening and accumulative plastic deformations [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Determination of Mohr-Coulomb Parameters for Modelling of Concrete

Lelovic

Vasović

2020

Crystals

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Cohesion is defined as the shear strength of material when compressive stress is zero. This article presents a new method for the experimental determination of cohesion at pre-set angles of shear deformation. Specially designed moulds are created to force deformation (close to τ-axis) at fixed pre-set values of angle with respect to normal stress σ. Testing is performed on series of concrete blocks of different strengths. From the compressive side, cohesion is determined from the extrapolation of the linear Mohr–Coulomb (MC) model, as the intercept on the shear stress axis. From the tensile stress side (from the left), cohesion is obtained using the Brazilian test results: first, indirect tensile strength of material σtBT is measured, then Mohr circle diagram values are calculated and cohesion is determined as the value of shear stress τBT on the Mohr circle where normal stress (σ)t = 0. A hypothesis is made that cohesion is the common point between two tests. In the numerical part, a theory of ultimate load is applied to model Brazilian test using the angle of shear friction from the MC model. Matching experimental and numerical results confirm that the proposed procedure is applicable in numerical analysis.

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Determination of Mohr–Coulomb Parameters from Nonlinear Strength Criteria for 3D Slopes

Cited by 8 publications

References 34 publications

Analysis of Maximum Economic Length of Soil Nail for Slope Stability

Analysis of Maximum Economic Length of Soil Nail for Slope Stability

Selection of appropriate strength envelopes for open pit slope stability analyses in soils and weak rocks

Determination of Mohr-Coulomb Parameters for Modelling of Concrete

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