Experimental Study on the Damage Characteristics and Acoustic Properties of Red Sandstone with Different Water Contents under Microwave Radiation

Liu, Junjun; Xie, Jing; Yang, Bohan; Li, Fei; Deng, Hu-Chao; Yang, Zundong; Gao, Mingzhong

doi:10.3390/ma16030979

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…The research findings demonstrated significant variations in the roughness of rock samples associated with different water content. Moreover, the study revealed that different degrees of rock damage occurred due to distinct microwave radiation levels 41 . Wang's research shows that water content is positively correlated with DIF of sandstone 42 – 44 .…”

Section: Introductionmentioning

confidence: 98%

Influence of dynamic load and water on energy accumulation and dissipation in sandstone

Yang,

Xing,

Fang

et al. 2023

Sci Rep

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In various engineering projects such as mineral extraction, hydropower resource utilization, railway construction, and geological hazard mitigation, rock engineering is often encountered. Furthermore, dynamic loads and moisture content exert notable influence on the energy transformation processes within rocks. Yet, the specific interplay of dynamic loading and water's impact on the energy conversion mechanism within the sandstone remains unexplored. To address this gap, this study conducted impact loading experiments on sandstone, elucidating the rock’s mechanical response under these conditions and unraveling the underlying energy conversion mechanisms. It was observed that the strength of sandstone exhibits a direct correlation with impact velocity. Moreover, employing energy calculation principles, we established a connection between moisture content and the sandstone’s internal energy conversion properties. The study also delved into the microscopic fracture mechanisms within the sandstone, ultimately concluding that both water content and dynamic loading have a significant impact on these microscopic fracture mechanisms.

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Section: Introductionmentioning

confidence: 98%

Influence of dynamic load and water on energy accumulation and dissipation in sandstone

Yang,

Xing,

Fang

et al. 2023

Sci Rep

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“…In a series of experiments to examine the pore distribution of sandstones in various saturated water, Zhou and Cai discovered that at identical water content, the sandstone tensile strength differed considerably [25][26][27][28]. Sandstone's fracture penetration rate clearly varies with varying water contents, based on Liu's study of the impact of water content on the damage features of the sandstone [29]. Natural and saturated sandstones were tested with tensile tests by Liu, who discovered that the crack propagation in sandstones began in the center [30].…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Behavior and Mechanism of Sandstone under the Coupling Effect of Water Content and Dynamic Load

Chen

Ting

2023

Processes

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In the process of underground engineering construction, rock mass often faces the dual influence of dynamic load disturbance and groundwater, it is therefore essential to investigate the mechanical response of the rock mass under the coupling effect of dynamic load disturbance and water content. In this paper, dynamic load impact tests were carried out on sandstone with bullet velocities of 5 m/s, 10 m/s, and 15 m/s and water content of 0, 0.3, 0.6, and 0.9, and the mechanical behavior and mechanism response of water content to sandstone were investigated. The research findings indicate that this study has made significant contributions in quantifying the along grain and trans-grain fractures of microcracks. It has explored the influence of water content and dynamic loading on the strength mechanism of sandstone. It was discovered that the dynamic loading and water content significantly affect the ratio of along grain and trans-grain fractures, thereby influencing the dynamic behavior of sandstone. The findings suggest a negative association between rock strength and water content and that its peak strength rises as the bullet velocity rises. The fracture characteristics of rock are influenced by water content and bullet velocity. The sample’s fracture degree increases with an increase in water content, its particle size distribution map is evident, and there is a positive relation between bullet velocity and fractal dimension. The energy conversion mechanism of the rock is influenced by the water content, as the bullet velocity increases, the absorbed energy density of the rock becomes higher. Furthermore, the correlation between the absorbed energy intensity and density and its fractal dimension is quantified. It is found that energy density and strength are positively correlated. The greater the fractal dimension, the higher the energy density absorbed.

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“…The large amount of waterbased fracturing fluid in hydraulic fracturing, however, creates water-related problems such as potential impacts on the environment and groundwater, formation damage resulting from capillary retention and clay swelling, and the high level of consumption of freshwater, placing demands on local water supplies. Consequently, to avoid or minimize these waterrelated issues, the research and development into waterless or reduced-water fracturing methods have been active in recent years [1][2][3][4][5]. Cryogenic fracturing has been researched as a potentially effective waterless fracturing method.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic Fracture Proliferation from Boreholes under Stresses

2023

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Cryogenic fracturing has been explored in recent years as a waterless fracturing method for well stimulation to avoid issues encountered in water-based hydraulic fracturing. Cryogenic stimulation using liquid nitrogen applies large thermal gradients on reservoir rocks to induce fractures. This study investigates the initiation and proliferation of cryogenic fractures from boreholes under external stress on specimens. We flowed liquid nitrogen through boreholes drilled through the center of transparent PMMA cylinders under uniaxial stress and monitored fracture proliferation, temperatures, and borehole pressures. Our results show that the effect of stress resembles that of hydraulic fractures such that fractures propagate more in the direction of the stress. Under loading perpendicular to the borehole axis, a cloud of annular and longitudinal fractures extends more in the direction of loading. Under loading parallel to the borehole axis, longitudinal fractures dominate, and annular fractures become more suppressed and more sparsely distributed than those of unconfined specimens. Even if fractures are driven to initiate against the influence of stress, such as those from a boundary edge of a high stress concentration, they gradually deflect in the direction of stress, similar to hydraulic fractures from perforation holes that curve toward a direction perpendicular to the minimum stress direction.

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Experimental Study on the Damage Characteristics and Acoustic Properties of Red Sandstone with Different Water Contents under Microwave Radiation

Cited by 10 publications

References 30 publications

Influence of dynamic load and water on energy accumulation and dissipation in sandstone

Influence of dynamic load and water on energy accumulation and dissipation in sandstone

Study on Mechanical Behavior and Mechanism of Sandstone under the Coupling Effect of Water Content and Dynamic Load

Cryogenic Fracture Proliferation from Boreholes under Stresses

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