Acoustic emission characteristics of high-temperature granite through different cooling paths

Yuan, Honghao; Sun, Qiang; Geng, Jishi; Ge, Zhenlong; Yuan, Shihao

doi:10.1007/s40948-022-00407-0

Cited by 9 publications

(3 citation statements)

References 31 publications

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“…They found that the coal rock was more susceptible to the development of pore and seam networks under high- and low-temperature impacts, leading to a significant increase in the permeability of anthracite by 469.24%, which was substantially greater than the 48.68% increase observed under cold impacts alone. Naseer et al , and Yuan et al conducted comparative experiments on granite subjected to water cooling, air cooling, and liquid-nitrogen cooling under identical high-temperature conditions. Their findings indicated that liquid nitrogen brought about the most pronounced thermal damage in the coal rock, facilitating the formation of connective pores, thus suggesting the superiority of liquid nitrogen in the cold impact treatment of coal rocks.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effects of High- and Low-Temperature Cyclic Impact on Pore and Fracture Distributions and Acoustic Emission Characteristics of Coal Measure Sandstone

Wang,

Kang,

Kang

et al. 2024

Energy Fuels

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Sandstone is a common type of rock found in coal measure reservoirs, and its pore and fracture distributions are key factors influencing the comining of coal and gas. To improve the structure of coal measure reservoirs and enhance interlayer compatibility, a method for high-and low-temperature cyclic impact on sandstone was developed in this study, and the effects of high-temperature (+200 °C) and low-temperature (−196 °C) cyclic impacts (number of cycles: 0, 1, 5, 10, and 15) on the pore and fracture distribution characteristics of sandstone were investigated. Ultrasonic testing, low-temperature nitrogen adsorption tests, micro-CT scanning, uniaxial compression tests, and acoustic emission (AE) tests were employed to analyze and characterize the distribution patterns of the pores and fractures in sandstone under different impact conditions. With the increase in the number of high-and low-temperature cyclic impacts, the peak pore and fracture diameters and porosities of the sandstone samples were found to increase logarithmically, whereas the P-wave velocity, uniaxial compressive strength, and AE b value decreased logarithmically. After the fifth high-and low-temperature cyclic impact, the relative decay rate of the P-wave velocity and the increase in the porosity of the sandstone samples reached maximum, which were 20.86% and 20.98%, respectively. The application of highand low-temperature cyclic impact could promote the development of pore fractures and the emergence of secondary fractures in sandstone, forming a pore network. The cyclic thermal impact helped improve the pore fracture distribution and increase the number of transport channels for coal gas molecules, thus enhancing the permeability and interlayer compatibility of sandstone and creating the necessary conditions for the colayering and comining of coal and gas.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effects of High- and Low-Temperature Cyclic Impact on Pore and Fracture Distributions and Acoustic Emission Characteristics of Coal Measure Sandstone

Wang,

Kang,

Kang

et al. 2024

Energy Fuels

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“…As sandstones are one of the most common rock formations (Yin et al, 2021), it is essential to study the changes in resistivity to investigate the geological structure and solve related geological problems. Previous studies have focused on the influence of fractures (Park et al, 2017), pressure (Amalokwu and Falcon-Suarez, 2021;Zheng et al, 2023), temperature (Zhang et al, 2016;Liu et al, 2020;Yuan et al, 2022), and rock type (Wu et al, 2023) on rock resistivity. However, research on the resistivity of sandstone is not extensive enough.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the influence of saturation on the resistivity response of sandstone

He,

Zheng,

et al. 2024

Front. Earth Sci.

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Studying the changes in electrical resistivity of sandstones under various frequencies and saturation levels is important for addressing many geological problems through electrical prospecting. In this study, we investigated the effect of different frequencies (500 Hz–200 kHz) and saturation levels (0%–100%) on the resistivity of sandstone in the Ordos region. Our research indicates that when the saturation level is low (<40%), the resistivity of the sandstone decreases rapidly. With the increase of saturation level, pore water gradually becomes another major factor affecting resistivity in addition to induced polarization effect. When the saturation level is high (>80%), the resistivity tends to stabilize. Additionally, the resistivity of sandstone decreases with the increase of saturation. Furthermore, with an increase in frequency, the rate of reduction in resistivity gradually slows down, and the resistivity of sandstone decreases under the influence of saturation. This study provides a valuable reference for the practical application of sandstone resistivity in geological prospecting.

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“…These findings suggest the potential for evaluating rock damage and predicting mechanical parameters. Kumari et al 7,8 investigated the impact of different cooling modes on the physical and mechanical properties of high-temperature granites. They found that rapid cooling led to more severe internal fractures, increased fracture density, and greater mechanical strength deterioration compared to natural cooling.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the macro- and micromechanical properties of water-cooled granite at different high temperatures

Wang,

Zhang

et al. 2024

Preprint

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To investigate the influence of high-temperature and water-cooling treatments on the macro and micro-mechanical properties of granite, uniaxial compression tests were conducted on the treated samples using the MTS815.04 testing system. Simultaneously, acoustic emission signals were collected, and micro-mechanical experiments were performed using a nanoindenter for further analysis. The results revealed that (1) with increasing temperature, the peak strength and elastic modulus of granite decreased, leading to a deterioration in mechanical properties, with a pronounced degradation trend observed after 400–500 ℃. (2) The ringing count of acoustic emission exhibited a similar trend over time within the range of 25–400 ℃, with an increasing proportion of active period I and a decreasing quiet period. The quiet period disappeared at 500 ℃, indicating a significant increase in the influence of high temperature and rapid cooling on internal rock damage beyond 500 ℃. (3) When the temperature is below 500 ℃, the slow decline in the macroscopic mechanical properties of granite is attributed to the differences in the thermophysical properties and content of minerals. However, the rapid decline in the microscopic mechanical properties of the minerals and the generation and propagation of microcracks may be the primary factors contributing to the deterioration of the macroscopic mechanical properties of granite above 500 ℃. (4) The water-cooled granite's uniaxial damage mode changed from tensile damage to tensile‒shear composite damage at 400 ℃ and finally to shear damage at 800 ℃.

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Acoustic emission characteristics of high-temperature granite through different cooling paths

Cited by 9 publications

References 31 publications

Experimental Study on the Effects of High- and Low-Temperature Cyclic Impact on Pore and Fracture Distributions and Acoustic Emission Characteristics of Coal Measure Sandstone

Experimental Study on the Effects of High- and Low-Temperature Cyclic Impact on Pore and Fracture Distributions and Acoustic Emission Characteristics of Coal Measure Sandstone

Experimental study of the influence of saturation on the resistivity response of sandstone

Experimental investigation on the macro- and micromechanical properties of water-cooled granite at different high temperatures

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