The Kaiser Effect under Multiaxial Nonproportional Compression of Sandstone

Panteleev, Ivan; Mubassarova, V. A.; Zaitsev, Alexey V.; Karev, V. I.; Kovalenko, Yu. F.; Устинов, К. Б.; Shevtsov, N. I.

doi:10.1134/s1028335820110075

Dokl. Phys.

2020

DOI: 10.1134/s1028335820110075

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The Kaiser Effect under Multiaxial Nonproportional Compression of Sandstone

Ivan Panteleev

V. A. Mubassarova

Alexey V. Zaitsev

et al.

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Cited by 6 publications

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“…Mechanical tests were carried out on the triaxial independent loading testing system (TILTS) in the laboratory of geomechanics [22][23][24]. Independent loading in three orthogonal directions is carried out due to the original kinematic scheme applied in the design of the loading unit, which allows the pressure plates to converge in three directions without interfering with each other [25,26].…”

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Tensor compaction of porous rocks: theory and experimental verification

Panteleev

Lyakhovsky

Mubassarova

et al. 2022

PMI

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Compaction in sedimentary basins has been traditionally regarded as a one-dimensional process that ignores inelastic deformation in directions orthogonal to the active load. This study presents new experiments with sandstone demonstrating the role of three-dimensional inelastic compaction in cyclic true triaxial compression. The experiments were carried out on the basis of a triaxial independent loading test system in the Laboratory of Geomechanics of the Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Science. The elastic moduli of the material were estimated from the stress-strain curves and the elastic deformations of the sample in each of the three directions were determined. Subtracting the elastic component from the total deformation allowed to show that inelastic compaction of the sandstone is observed in the direction of active loading, whereas in the orthogonal directions there is a expansion of the material. To describe the three-dimensional nature of the compaction, a generalization of Athy law to the tensor case is proposed, taking into account the role of the stress deviator. The compaction tensor and the kinetic equation to describe the evolution of inelastic deformation, starting from the moment of the load application are introduced. On the basis of experiments on cyclic multiaxial compression of sandstone, the identification and verification of the constructed model of tensor compaction were carried out. The possibility of not only qualitative, but also quantitative description of changes in inelastic deformation under complex cyclic triaxial compression is shown.

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confidence: 99%

Tensor compaction of porous rocks: theory and experimental verification

Panteleev

Lyakhovsky

Mubassarova

et al. 2022

PMI

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Experimental Study of Compact Sandstone Deformation Under Axisymmetric Triaxial Loading Along Specific Paths in Stress Space

Janeček,

Mishra,

Vishnu

et al. 2023

Rock Mech Rock Eng

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The deformation of rocks well below their ultimate strengths is frequently described through the constant stiffness moduli of the linear elasticity theory. In addition, the isotropic material approximation is usually used as the basic approach. Particularly in sedimentary rocks, local inhomogeneities, anisotropy, and irreversible processes, mainly related to the gradual breakage of grain joints, can affect their deformation behavior from the beginning of the loading. Consequently, the stiffness moduli measured under triaxial conditions are effective parameters, which may depend on the loading path in the stress space. Therefore, a complex experimental study of the deformation response of compact sedimentary rock (Brenna sandstone) along various paths in triaxial stress space was prepared to understand this dependence. In addition, a detailed analysis of the rock composition and structure of this compact sandstone was carried out. This paper presents an initial experimental study that is based on a loading method using alternative stress paths that correspond to different modes of the monotonic increase in differential stress from an initial isotropic compression state. In the experiment, the dependence of stiffness moduli on the loading path was found. Differences in rock deformation for conventional triaxial compression and extension can be attributed to a slight rock anisotropy originating from the stratification. The different behavior of deformation and related stiffness moduli along so-called reduced triaxial paths and conventional paths indicates that irreversible processes must be taken into account.

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Damage evolution and acoustic emission characteristics of hydrochemically corroded limestone

Wang

Feng

et al. 2023

Bull Eng Geol Environ

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The Kaiser Effect under Multiaxial Nonproportional Compression of Sandstone

Cited by 6 publications

References 5 publications

Tensor compaction of porous rocks: theory and experimental verification

Tensor compaction of porous rocks: theory and experimental verification

Experimental Study of Compact Sandstone Deformation Under Axisymmetric Triaxial Loading Along Specific Paths in Stress Space

Damage evolution and acoustic emission characteristics of hydrochemically corroded limestone

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