The Experts below are selected from a list of 3132 Experts worldwide ranked by ideXlab platform

Joseph F Labuz - One of the best experts on this subject based on the ideXlab platform.

  • Paul-Mohr-Coulomb Failure Criterion for Geomaterials
    Journal of Geotechnical and Geoenvironmental Engineering, 2018
    Co-Authors: Feitao Zeng, Joseph F Labuz
    Abstract:

    AbstractPaul-Mohr-Coulomb (PMC) Failure criterion provides enhanced representations of pyramidal Failure surfaces, with recognizable material parameters, by considering all three principal stresses...

  • paul mohr coulomb Failure surface of rock in the brittle regime
    Geophysical Research Letters, 2015
    Co-Authors: Roman Y Makhnenko, Justice Harvieux, Joseph F Labuz
    Abstract:

    The Paul-Mohr-Coulomb Failure criterion includes the intermediate principal stress sigma(II) and friction angles at the limiting stress states of sigma(II)= sigma(III) and sigma(II) = sigma(I), where sigma(I) and sigma(III) are major and minor principal stresses. Conventional triaxial compression (sigma(II) = sigma(III)), extension (sigma(II) = sigma(I)), and plane strain (sigma(I) not equal sigma(II) not equal sigma(III)) experiments were performed on dry rock. The Failure data were plotted in principal stress space, and material parameters were determined in the context of two internal friction angles and the theoretical uniform triaxial (all-around equal) tensile strength. Assuming isotropy, the triaxial compression and extension results were used to construct a six-sided pyramidal Failure surface, and the extension friction angle was larger than the compression friction angle, a sufficient but not necessary condition of the intermediate stress effect. To capture the behavior of the rock in multiaxial loading, the Paul-Mohr-Coulomb criterion was extended to form a 12-sided pyramid with best fit planes.

  • Paul‐Mohr‐Coulomb Failure surface of rock in the brittle regime
    Geophysical Research Letters, 2015
    Co-Authors: Roman Y Makhnenko, Justice Harvieux, Joseph F Labuz
    Abstract:

    The Paul-Mohr-Coulomb Failure criterion includes the intermediate principal stress sigma(II) and friction angles at the limiting stress states of sigma(II)= sigma(III) and sigma(II) = sigma(I), where sigma(I) and sigma(III) are major and minor principal stresses. Conventional triaxial compression (sigma(II) = sigma(III)), extension (sigma(II) = sigma(I)), and plane strain (sigma(I) not equal sigma(II) not equal sigma(III)) experiments were performed on dry rock. The Failure data were plotted in principal stress space, and material parameters were determined in the context of two internal friction angles and the theoretical uniform triaxial (all-around equal) tensile strength. Assuming isotropy, the triaxial compression and extension results were used to construct a six-sided pyramidal Failure surface, and the extension friction angle was larger than the compression friction angle, a sufficient but not necessary condition of the intermediate stress effect. To capture the behavior of the rock in multiaxial loading, the Paul-Mohr-Coulomb criterion was extended to form a 12-sided pyramid with best fit planes.

  • Mohr–Coulomb Failure Criterion
    Rock Mechanics and Rock Engineering, 2012
    Co-Authors: Joseph F Labuz, Arno Zang
    Abstract:

    List of Symbols a (m 1)/(m ? 1) b 1/(m ? 1) c Cohesion C0 Uniaxial compressive strength m (1 ? sin /)/(1 sin /) S0 Inherent shear strength (cohesion) T Uniaxial tensile strength T0 Theoretical MC uniaxial tensile strength / Angle of internal friction l = tan / Coefficient of internal friction r Normal stress on plane s Shear stress on plane r1, r2, r3 Principal stresses, with no regard to order rI, rII, rIII Major, intermediate, minor principal stresses rm (rI ? rIII)/2 sm (rI rIII)/2 rI * C0 mT rIII * -T 1 Description

Hu Xiao-rong - One of the best experts on this subject based on the ideXlab platform.

  • Calculation of Coulomb's Earth Pressure Based on Triple Shear Failure Criterion
    2010
    Co-Authors: Hu Xiao-rong
    Abstract:

    The Coulomb's earth pressure is researched based on the triple shear Failure criterion.(1)The Mohr-Coulomb Failure criterion is replaced by the triple shear Failure criterion in which the Failure properties of the rock and soil under the three dimensional stress states can be reflected better than the Mohr-Coulomb Failure criterion used before.The triple shear Failure criterion takes the Mohr-Coulomb Failure criterion only one of its special cases.(2)The Coulomb's earth pressure deduced from the new Failure criterion is more suitable for many kinds of rock and soil than that from the Mohr-Coulomb Failure criterion and takes the latter only one of its special cases too.(3)Example shows that the Coulomb's earth pressure is concerned with the stress states and the mechanical properties for the rock and soil.The active earth pressure may be overvalued,while the passive earth pressure may be undervalued.

  • Limit pressures for thick wall cylinders based on the triple shear unified Failure criterion
    Journal of Fuzhou University, 2006
    Co-Authors: Hu Xiao-rong
    Abstract:

    New unified limit pressure solutions for thick wall cylinders are obtained with the triple shear unified Failure criterion.Solutions based on the Mohr-Coulomb Failure criterion,the Tresca yield criterion and the Von Mises yield criterion are all its special cases.Analyses indicate that the limit pressures of the thick wall cylinders are influenced by ratio of the tensile to compressive yield limits(a) and effective parameter of the intermediate principal stress(b).The elastic and the plastic inner limit pressures increased with b and decrease with a,but the outer limit pressures are reverse to them.

A. Ghahramani - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Foundation Size and Roughness on the Bearing Capacity Factor, N _ γ , by Stress Level-Based ZEL Method
    Arabian Journal for Science and Engineering, 2012
    Co-Authors: M. Jahanandish, M. Veiskarami, A. Ghahramani
    Abstract:

    It has been well recognized that soil shear strength parameters are dependent on the level of induced stress and the Mohr–Coulomb Failure envelope is a curve. Variation of soil internal friction angle with different levels of confining pressure forms an internal friction angle distribution field beneath a foundation that differs under different size foundations. This difference suggests using different values of the bearing capacity factor, N _ γ , according to the foundation size. In this study, a stress level-based method of the zero extension lines (ZEL) is employed to take the nonlinearity of the Mohr–Coulomb Failure envelope into account in determination of the bearing capacity factor, N _ γ , as a function of the foundation size. An associative flow rule was adopted in the stress level-based ZEL method to make the results comparable with existing data. Values of N _ γ were computed for both smooth and rough base foundations. Effect of foundation roughness was also studied.

  • Effect of Foundation Size and Roughness on the Bearing Capacity Factor, Nγ , by Stress Level-Based ZEL Method
    Arabian Journal for Science and Engineering, 2012
    Co-Authors: M. Jahanandish, M. Veiskarami, A. Ghahramani
    Abstract:

    It has been well recognized that soil shear strength parameters are dependent on the level of induced stress and the Mohr–Coulomb Failure envelope is a curve. Variation of soil internal friction angle with different levels of confining pressure forms an internal friction angle distribution field beneath a foundation that differs under different size foundations. This difference suggests using different values of the bearing capacity factor, N γ , according to the foundation size. In this study, a stress level-based method of the zero extension lines (ZEL) is employed to take the nonlinearity of the Mohr–Coulomb Failure envelope into account in determination of the bearing capacity factor, N γ , as a function of the foundation size. An associative flow rule was adopted in the stress level-based ZEL method to make the results comparable with existing data. Values of N γ were computed for both smooth and rough base foundations. Effect of foundation roughness was also studied.

Roman Y Makhnenko - One of the best experts on this subject based on the ideXlab platform.

  • paul mohr coulomb Failure surface of rock in the brittle regime
    Geophysical Research Letters, 2015
    Co-Authors: Roman Y Makhnenko, Justice Harvieux, Joseph F Labuz
    Abstract:

    The Paul-Mohr-Coulomb Failure criterion includes the intermediate principal stress sigma(II) and friction angles at the limiting stress states of sigma(II)= sigma(III) and sigma(II) = sigma(I), where sigma(I) and sigma(III) are major and minor principal stresses. Conventional triaxial compression (sigma(II) = sigma(III)), extension (sigma(II) = sigma(I)), and plane strain (sigma(I) not equal sigma(II) not equal sigma(III)) experiments were performed on dry rock. The Failure data were plotted in principal stress space, and material parameters were determined in the context of two internal friction angles and the theoretical uniform triaxial (all-around equal) tensile strength. Assuming isotropy, the triaxial compression and extension results were used to construct a six-sided pyramidal Failure surface, and the extension friction angle was larger than the compression friction angle, a sufficient but not necessary condition of the intermediate stress effect. To capture the behavior of the rock in multiaxial loading, the Paul-Mohr-Coulomb criterion was extended to form a 12-sided pyramid with best fit planes.

  • Paul‐Mohr‐Coulomb Failure surface of rock in the brittle regime
    Geophysical Research Letters, 2015
    Co-Authors: Roman Y Makhnenko, Justice Harvieux, Joseph F Labuz
    Abstract:

    The Paul-Mohr-Coulomb Failure criterion includes the intermediate principal stress sigma(II) and friction angles at the limiting stress states of sigma(II)= sigma(III) and sigma(II) = sigma(I), where sigma(I) and sigma(III) are major and minor principal stresses. Conventional triaxial compression (sigma(II) = sigma(III)), extension (sigma(II) = sigma(I)), and plane strain (sigma(I) not equal sigma(II) not equal sigma(III)) experiments were performed on dry rock. The Failure data were plotted in principal stress space, and material parameters were determined in the context of two internal friction angles and the theoretical uniform triaxial (all-around equal) tensile strength. Assuming isotropy, the triaxial compression and extension results were used to construct a six-sided pyramidal Failure surface, and the extension friction angle was larger than the compression friction angle, a sufficient but not necessary condition of the intermediate stress effect. To capture the behavior of the rock in multiaxial loading, the Paul-Mohr-Coulomb criterion was extended to form a 12-sided pyramid with best fit planes.

M. Jahanandish - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Foundation Size and Roughness on the Bearing Capacity Factor, N _ γ , by Stress Level-Based ZEL Method
    Arabian Journal for Science and Engineering, 2012
    Co-Authors: M. Jahanandish, M. Veiskarami, A. Ghahramani
    Abstract:

    It has been well recognized that soil shear strength parameters are dependent on the level of induced stress and the Mohr–Coulomb Failure envelope is a curve. Variation of soil internal friction angle with different levels of confining pressure forms an internal friction angle distribution field beneath a foundation that differs under different size foundations. This difference suggests using different values of the bearing capacity factor, N _ γ , according to the foundation size. In this study, a stress level-based method of the zero extension lines (ZEL) is employed to take the nonlinearity of the Mohr–Coulomb Failure envelope into account in determination of the bearing capacity factor, N _ γ , as a function of the foundation size. An associative flow rule was adopted in the stress level-based ZEL method to make the results comparable with existing data. Values of N _ γ were computed for both smooth and rough base foundations. Effect of foundation roughness was also studied.

  • Effect of Foundation Size and Roughness on the Bearing Capacity Factor, Nγ , by Stress Level-Based ZEL Method
    Arabian Journal for Science and Engineering, 2012
    Co-Authors: M. Jahanandish, M. Veiskarami, A. Ghahramani
    Abstract:

    It has been well recognized that soil shear strength parameters are dependent on the level of induced stress and the Mohr–Coulomb Failure envelope is a curve. Variation of soil internal friction angle with different levels of confining pressure forms an internal friction angle distribution field beneath a foundation that differs under different size foundations. This difference suggests using different values of the bearing capacity factor, N γ , according to the foundation size. In this study, a stress level-based method of the zero extension lines (ZEL) is employed to take the nonlinearity of the Mohr–Coulomb Failure envelope into account in determination of the bearing capacity factor, N γ , as a function of the foundation size. An associative flow rule was adopted in the stress level-based ZEL method to make the results comparable with existing data. Values of N γ were computed for both smooth and rough base foundations. Effect of foundation roughness was also studied.