Influence of thermal heating on elastic wave velocities in granulite

Lokajı́ček, T.; Rudajev, Vladimı́r; Dwivedi, R.; Goel, Ramesh; Swarup, Anand

doi:10.1016/j.ijrmms.2012.05.012

Cited by 21 publications

(5 citation statements)

References 25 publications

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“…Multidirectional (up to 132 independent directions) experiments are necessary in case of lower symmetry, unknown orientation of anisotropy or simply to diminish the effect of rock heterogeneity (e.g., Martínková et al., 2000; Pros et al., 1998) and to study fabric symmetry (e.g., Přikryl et al., 2007). Recently, such experiments were applied to investigate in detail anisotropy of shear waves (Keppler et al., 2015; Lokajíček & Svitek, 2015; Lokajíček et al., 2014; Svitek et al., 2014), the influence of thermal treatment to elastic anisotropy (e.g., Lokajíček et al., 2012) and attenuation anisotropy (Svitek et al., 2017). In addition, diffraction methods, such as neutron diffraction (ND), could be used to determine crystal preferred orientations (e.g., Ivankina & Matthies, 2015; Wenk, 2006) in bulk rocks and calculate intrinsic elastic properties using advanced micromechanical models.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic Elastic Anisotropy of Westerly Granite Observed by Ultrasound Measurements, Microstructural Investigations, and Neutron Diffraction

et al. 2021

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Granitic rocks attract attention because of their elastic and mechanical properties. A large number of dedicated experimental studies has been initiated due to relevance of granites to development of nuclear waste storage, geothermal projects, rock mechanics, and earthquake mechanics. Quantification of elastic properties of granites is important to determine crustal seismic velocities and stress orientation. Generally, it is assumed that granitic rocks are elastically isotropic. To determine whether rock material is isotropic or anisotropic ultrasonic methods can be applied (Babuška, 1968; Bajuk et al., 1967; Barruol and Kern. 1996; Kern & Wenk, 1990). Multidirectional (up to 132 independent directions) experiments are necessary in case of lower symmetry, unknown orientation of anisotropy or simply to diminish the effect of rock heterogeneity (e.g.,

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Section: Introductionmentioning

confidence: 99%

Intrinsic Elastic Anisotropy of Westerly Granite Observed by Ultrasound Measurements, Microstructural Investigations, and Neutron Diffraction

et al. 2021

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“…Compared with the normal temperature state, the mechanical properties of heat-treated rock usually deteriorate, which in turn affects the stability and safety of underground high-temperature rock mass engineering (Chen et al, 2014;Shao et al, 2014;Yang et al, 2017). Lokajicek et al (2012) and Zhang et al (2018) tested the physical properties of granite after high temperature treatment, and found that its volume, porosity, and permeability all increase with temperature, but the P-wave velocity and density generally show a downward trend. analyzed the mechanical properties of marble in a geothermal environment and found a degradation of peak strength at a temperature of 600 C. Kumari et al (2018) and Jin et al (2019) studied the effects of two methods of rapid cooling and slow cooling on the mechanical behavior of Strathbogie granite in Australia, and found that rapid cooling would aggravate the damage of the rock.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on mechanical properties and statistical damage constitutive model of red sandstone after heating and water-cooling cycles

Jiang

Zhang

et al. 2022

International Journal of Damage Mechanics

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The repeated action of high temperature and water cooling will have a strong deteriorating effect on the mechanical properties of the rock, which will eventually lead to the damage and cracking of the rock. In order to study the influence of heating and water-cooling cycles on rocks, the P-wave velocity and mechanical properties of red sandstone after heating and water-cooling cycles were tested. Meanwhile, based on the Weibull distribution theory, a statistical damage constitutive model based on Mohr-Coulomb strength criterion considering the effects of heating and water-cooling cycles was established, and verified based on the results of triaxial tests. The results show that the P-wave velocity and peak intensity decrease with the temperature under the same number of cycles. The elastic modulus will decrease with the temperature and the number of cycles, indicating that the red sandstone will gradually soften and the ductility will increase under repeated high temperature and water-cooling cycles. And the model can well reflect the stress-strain curves of different high temperature and water-cooling cycles. The research results can provide analytical theories and methods for geothermal development projects.

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“…Statistical information on the correlation between compressional and shear wave velocities and the corresponding Poisson's ratios of different lithologies at different pressure-temperature conditions has also been found [29][30][31][32][33]. Lokajíček et al [34] studied the influence of thermal heating on elastic wave velocity within granulite samples under different stress levels using a three-dimensional P-wave elastic anisotropy method.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Velocities of Coals of Diverse Rank under Water- or Gas-Saturated Conditions for Application in Coalbed Methane Recovery

Zhai

Ranjith

et al. 2019

Geofluids

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Coalbed methane recovery enhanced by hydraulic or nonaqueous fracturing methods has been studied for decades, and it is of significance to evaluate fracturing results and scope for field applications. Monitoring variation in velocity is one way to explain fracturing effects. However, the existence of residual water or gas within cracks or pores may affect velocity measurements, and the correlation between velocity and inherent coal attributes (such as density and porosity) has not been studied comprehensively. In this paper, coal of different ranks (lignite, bituminite, and anthracite) was prepared under water and gas saturation to approximately simulate the residual water and gas in cracks under field applications. Correlations between the velocity and coal attributes were studied. For both water- and gas-saturated cores, the diverse velocity distributions were highly correlated to rank and saturation media. The longitudinal ultrasonic pulse velocity (UPVp) and transverse ultrasonic pulse velocity (UPVs) of different cores were distributed differently. For coal saturated with water or gas, the UPVp values of lignite, bituminite, and anthracite had positive linear correlations with the corresponding UPVs values. The discrete velocity ratio data were fit as negative linear correlations with UPVs, and different coals had different declining degrees, the difference of which might be attributed to the characteristics of structural cracks and the inherent properties of the coal, such as grain size and pore shape, which result in decreasing coal integrity and strength. Moreover, the difference in acoustic resistance between coal and fluids might have an inverse impact on the acoustic energy, and a larger difference might cause a large amount of energy to dissipate and finally cause the velocity to decrease. Under water and gas saturation conditions, the UPVp showed a positive linear correlation with density and a negative linear correlation with porosity. Finally, a potential field application was designed on the relations between the velocity and the elastic parameters to estimate fracturing effects by monitoring the petrophysical parameters of coal lithologies.

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Influence of thermal heating on elastic wave velocities in granulite

Cited by 21 publications

References 25 publications

Intrinsic Elastic Anisotropy of Westerly Granite Observed by Ultrasound Measurements, Microstructural Investigations, and Neutron Diffraction

Intrinsic Elastic Anisotropy of Westerly Granite Observed by Ultrasound Measurements, Microstructural Investigations, and Neutron Diffraction

Study on mechanical properties and statistical damage constitutive model of red sandstone after heating and water-cooling cycles

Investigation of the Velocities of Coals of Diverse Rank under Water- or Gas-Saturated Conditions for Application in Coalbed Methane Recovery

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