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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/923

Title: Shear strength response of some geological materials in triaxial compression
Authors: Ramamurthy, T
Keywords: shear strength of geological materials
shear strength
shear strength response
triaxial compression
in the strength
Issue Date: 2001
Citation: International Journal of Rock Mechanics and Mining Sciences, 38(5),683-697
Abstract: The shear strength of geological materials, like soils and rocks, is often represented either by Coulomb or Mohr–Coulomb theory. It is assumed to vary linearly with the applied stress through two shear strength parameters commonly known as the cohesion intercept and the angle of shearing resistance/friction. In reality, whenever these materials are tested to high stresses, a non-linear shear strength response is observed. The effective cohesion intercept continues to increase while the effective angle of shearing resistance decreases with the increase of effective stress. These strength parameters, therefore, cannot be considered as constants in the analysis of soils and rocks. A more realistic and responsive shear strength criterion, involving only two different strength parameters, that remain practically constant with the applied stress, is advocated to represent non-linear response that minimizes the drudgery by conducting a number of triaxial tests on the material. This criterion has been verified with the experimental data of 41 different soils from clay to rockfill and with the data of a number of intact rocks, jointed rocks and rock-like materials tested in the axisymmetric triaxial compression exhibiting either brittle or ductile response. One of the strength parameters enables to define the brittle–ductile boundary. A boundary between rock and soil has been suggested on the basis of modulus ratio and also on the basis of a weakness factor in a jointed rock, named joint factor, representing the combined influence of joint frequency, inclination of the sliding joint and the strength on the sliding joint. When the joint factor is applied to the compressive strength or the modulus of an intact specimen, it provides the corresponding values of the jointed mass in uniaxial compression and also enables to estimate the two strength parameters, for use in the strength criterion applicable to the mass. The modulus ratio is also linked to the failure axial strain of jointed rocks when tested in uniaxial compression.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/923
Appears in Collections:Civil Engineering

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