A review of methods, techniques and approaches on investigation of rock anisotropy

Abbas, Hasan Ali; Mohamed, Zainab; Yasir, S. F.

doi:10.1063/1.5062638

Cited by 7 publications

(6 citation statements)

References 30 publications

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“…Under the effect of temperature, the crystal lattice of the mineral and the structure of hard rocks changed with discontinuities such as microcracks and micropores [50,51]. Even a very little heating of the rock (temperature from 50°C) may induce microcracks in the microstructure of the rock [52][53][54][55]. Indeed, an increase in temperature produced a differential change in dimensions of the granulation of the rock, leading to microcracking [17,56,57].…”

Section: Influence Of High Temperature On the Microstructure Of Hard mentioning

confidence: 99%

“…For one thermal cycle of the hard rock, uniaxial stress gave more informations than other destructive tests [25]. e authors of [12,54,75,123] revealed that using the nondestructive method of P-wave velocity change with temperature. e authors of [102] showed that electromagnetic radiation in terms of intensity increased at the same stress level.…”

Section: Cool and Heat Tests Comparisonmentioning

confidence: 99%

“…e authors of [102] showed that electromagnetic radiation in terms of intensity increased at the same stress level. e authors of [54,89,102] illustrated that when the stress approaches the peak strength, the recorded acoustic emission activities mostly accumulated. We noted that under thermal load, the mechanical parameters which have been determined tend to reflect finally the reality of engineering projects.…”

Section: Cool and Heat Tests Comparisonmentioning

confidence: 99%

“…Normalized Young's modulus of certain rocks as function of temperature. and Miskovsky, 2012)[9] Granite (Saiang and Miskovsky, 2012)[9] Schist (Saiang and Miskovsky, 2012)[9] Sandstone (Yu et al, 2015)[13] Granite(Wu et al, 2019) [24] Granite (Isaka et al, 2018)[54] Static Poisson's ratio of sandstone as a function of temperature.…”

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confidence: 99%

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Experimental and Theoretical Investigations of Hard Rocks at High Temperature: Applications in Civil Engineering

Leroy

Marius

Nicolas

2021

Advances in Civil Engineering

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This review paper aims to survey and discuss recent theoretical and experimental works reporting the temperature effects on the mechanical properties of rocks like granite, gabbro, gneiss, marble, sandstone, basalt, limestone, and argillite to permit the new challenge in this domain. The effect of high temperatures on various mechanical and physical material properties (Young’s modulus, porosity, tensile and compressive strengths, P-wave velocity, permeability, thermal damage, and expansion) is analyzed. This work shows that hard rock mechanical and physical properties evolutions are strongly related to the evolution of the microstructure caused by the geological history, cracks nucleation occurrences, recrystallization, dehydroxylation, and dehydration reactions. However, it should be emphasized that these studies were not conducted on all types of intrusions and all rocks types. Meanwhile, it has been noticed that variations in temperature could lead to contradictory phenomena. Therefore, different trends were observed for the evolution of physical properties of rocks. There is an increase in porosity approximately 80% above 500°C. In general, for volcanic’s rock, the loss mass and thermal conductivity were drastically observed at low temperatures around 200°C with an antinomic phenomenon. Sandstone, granite, and argillite present the model whose behaviors with thermal load are too much explored accordingly with experiments compared with other rocks. Argillite at 200°C and sandstone and granite at 400°C undergo seriously damage. There is 100°C gap between the results obtained in real-time and those obtained after cooling. Moreover, 300°C can be considered as the critical temperature for real-time temperature heat treatment at which rocks lose almost about 80% of their performance. Otherwise, it is not easy to predict the behavior at high temperature of volcanic rocks like basalt and metamorphic rocks like gneiss which present the complexity in their behavior. For plutonic and metamorphic rocks, 600°C is the critical thermal load. At this temperature, the modulus of elasticity as well as the compressive strength of the most explored rock shows a significant decrease of about 75% for hard rocks. In sum, high temperature damages significantly the mechanical performance of rock. It is the reason for which these results may be useful to characterize the damage and thus predict the dramatic consequences of large temperature fluctuations on engineering structures in the rock.

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Section: Influence Of High Temperature On the Microstructure Of Hard mentioning

confidence: 99%

Section: Cool and Heat Tests Comparisonmentioning

confidence: 99%

Section: Cool and Heat Tests Comparisonmentioning

confidence: 99%

mentioning

confidence: 99%

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Experimental and Theoretical Investigations of Hard Rocks at High Temperature: Applications in Civil Engineering

Leroy

Marius

Nicolas

2021

Advances in Civil Engineering

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“…Considering the rock matrix with its geological history, the behavior of anisotropy may not be the same at high temperature. It is recognized as the dissimilarity response under mechanical or physical effects [30]. In light to this, equation (3) becomes…”

Section: Modeling Of Argillite Rock Specimen Under Uniaxial Mechanical and Thermal Loadmentioning

confidence: 99%

Modeling and Numerical Analysis in 3D of Anisotropic and Nonlinear Mechanical Behavior of Tournemire Argillite under High Temperatures and Dynamic Loading

Marius

Leroy

Nicolas

2020

The Scientific World Journal

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This work proposes a model that takes into account the anisotropy of material with its inhomogeneity and geometrical and material nonlinearities. According to Newton’s second law, the investigations were carried out on the simultaneous effects of mechanical load and thermal treatment on the Tournemire argillite material. The finite difference method was used for the numerical resolution of the problem by the MATLAB 2015a software in order to determine the peak stress and strain of argillite as a function of material nonlinearity and demonstrated the inhomogeneity parameter Ω. The critical temperature from which the material damage was pronounced is 500°C. Indeed, above this temperature, the loss of rigidity of argillite reduced significantly the mechanical performance of this rock. Therefore, after 2.9 min, the stress reduction in X or Y direction was 75.5% with a peak stress value of 2500 MPa, whereas in Z direction, the stress reduction was 74.1% with a peak stress value of 1998 MPa. Meanwhile, knowing that the material inhomogeneity was between 2995 and 3256.010, there was an increase in peak stress of about 75%. However, the influence of the material nonlinearity was almost negligible. Thus, the geometrical nonlinearity allows having the maximal constant strain of about 1.25 in the direction of the applied dynamic mechanical force.

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A spectral approach for nonlinear transversely isotropic elastic bodies, for a new class of constitutive equation: Applications to rock mechanics

Shariff

Bustamante

2020

Acta Mech

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A review of methods, techniques and approaches on investigation of rock anisotropy

Cited by 7 publications

References 30 publications

Experimental and Theoretical Investigations of Hard Rocks at High Temperature: Applications in Civil Engineering

Experimental and Theoretical Investigations of Hard Rocks at High Temperature: Applications in Civil Engineering

Modeling and Numerical Analysis in 3D of Anisotropic and Nonlinear Mechanical Behavior of Tournemire Argillite under High Temperatures and Dynamic Loading

A spectral approach for nonlinear transversely isotropic elastic bodies, for a new class of constitutive equation: Applications to rock mechanics

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