Estimation of strength properties of rock samples in terms of calculated Mohr’s envelopes

Жигалкин, В. М.; Rychkov, B. A.; Усольцева, О. М.; Цой, П. А.; Chynybaev, M. K.

doi:10.1134/s1062739147060025

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…Shkuratnik and Novikov (2012) used acoustic emission methods to study the progressive damage process of rocks under different confining pressures. Zhigalkin et al (2011) used the acoustic emission methods to study the effect of aggregate size and shape in concrete on the uneven shrinkage of concrete. Eberhardt et al (1998) studied the acoustic emission characteristics of rock specimens during cracking and concluded that a sudden increase in acoustic emission events corresponds to the creation of new cracks.…”

Section: Introductionmentioning

confidence: 99%

Deformation localization and crack propagation of sandstone containing different flaw inclination angles under different loading rates

Li,

Pan,

Zhang

et al. 2023

Front. Earth Sci.

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Defects with varying geometric distribution in the rock mass play a crucial role in determining the stability of engineered rock masses. Previous studies have primarily investigated the initiation, propagation, and coalescence behaviors of flaws within rock masses. Nevertheless, there has been limited analysis of flawed rock masses under different loading rates. In this study, we present the deformation localization and cracking process of three types of inclined flawed sandstone specimens through conducting uniaxial compression and acoustic emission tests at four different levels of loading rate. The results supported the following findings: 1) Sandstone specimens with different flaw inclination angles exhibit the loading rate strengthening effect, and the strengthening effect gradually decreases with the increase of loading rate. 2) As the loading rate increases, the type of crack emergence changes from wing cracks to anti-tensile cracks, and the time of flaw initiation is shortened. 3) The cumulative acoustic emission counts were higher for the low-loading rate specimens than for the high-loading rate specimens. 4) Tensile cracks typically occur as the initial cracks. Anti-tensile cracks often coexist with wing cracks in rock specimens that have undergone tensile damage. Coplanar secondary cracks are the primary indication of shear damage formation in rock specimens. 5) The increase in loading rate promotes the transition of rock specimens from the mixed tensile-shear damage mode to the shear damage mode. These research results are of great theoretical significance and engineering value for understanding the failure mechanism of rock mass containing flaws and proposing effective measures to prevent cracking and ensure the safety of brittle solid structures.

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Section: Introductionmentioning

confidence: 99%

Deformation localization and crack propagation of sandstone containing different flaw inclination angles under different loading rates

Li,

Pan,

Zhang

et al. 2023

Front. Earth Sci.

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Laboratory studies of geomechanical properties of deep-level rocks

Усольцева

Еременко

Shaposhnik

et al. 2019

IOP Conf. Ser.: Earth Environ. Sci.

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Rock Specimens Destruction Regularities under Uniaxial Compression

Makeeva

Trofimov

2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Modern approach to the stress-strain state assessment of a mining structure design, especially when it is non-linearly deformed and areas of local destruction appear, should be based on the principle of step-by-step loading in the form of small increments of the loading factor. At each such step, due to fracture, the deformation properties of the materials composing the region change, forming a generally non-uniform and, possibly, non-linear deformation medium. The modelling results of the rock massif state within this approach may differ significantly from the results for one-step loading, which is usually used in researches. The article discusses the use of an iterative process of loading and destruction as applied to the simplest design, namely, for one-dimensional loading of a homogeneous rock specimen. It is shown that under the “rigid” loading conditions, the described approach makes it possible to simulate the characteristic features of damage localization in the sample and the nonlinear nature of the deformation as a whole, including post failure deformation.

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Estimation of strength properties of rock samples in terms of calculated Mohr’s envelopes

Cited by 4 publications

References 3 publications

Deformation localization and crack propagation of sandstone containing different flaw inclination angles under different loading rates

Deformation localization and crack propagation of sandstone containing different flaw inclination angles under different loading rates

Laboratory studies of geomechanical properties of deep-level rocks

Rock Specimens Destruction Regularities under Uniaxial Compression

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