An experimental investigation on acoustic emission characteristics of sandstone rockburst with different moisture contents

Sun, Xiaoming; Xu, Huichen; Zheng, Liange; He, Manchao; Gong, Weili

doi:10.1007/s11431-016-0181-8

Cited by 31 publications

(15 citation statements)

References 30 publications

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“…During engineering, the mechanical properties and microstructure of rocks are likely to be modified, reducing the strength of the surrounding rock mass and leading to structural failure (Zhang and Feng 2015). Spraying water on the surface and injecting water into the surrounding rocks are two efficient ways of mitigating rockburst in practice Sun et al 2016;Zhou et al 2016b). Consequently, it is essential to study the effect of water on rock mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of water content on the mechanical properties of an artificial porous rock

Jiang

Chen

et al. 2021

Bull Eng Geol Environ

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Water content significantly affects the mechanical properties of porous rocks, for which both clay content and rock microstructure have been identified as main controlling factors. To study the influence of microstructure on the water effect on rock properties, artificial porous rock (APR) is made by heating Fangshan granite (FG). The mineral composition and microstructure of the thermally treated FG were determined, and 1000 °C was chosen as the treatment temperature to fabricate the APR. APR specimens with various water saturations (100%, 80%, 60%, 40%, 20%, and 0%) were prepared by drying fully saturated APR specimens. The quasi-static responses of the APR specimens during uniaxial and triaxial compression (with confining pressures of 5 MPa and 10 MPa) experiments were obtained. The results show that the uniaxial compressive strength (UCS) of the APR slightly increases with increasing water saturation from dry (0% saturation) to 60% saturation, and the cohesion shows a similar trend. However, the triaxial compressive strength decreases with increasing water saturation. The cohesion and internal frictional angle were obtained from the compression tests, and their dependence on the saturation was revealed, which can be explained by the interaction of the water and the rock microstructure. Keywords Heat treatment • Artificial porous rock (APR) • Water content • Water weakening mechanism • Saturation List of symbols APR Artificial porous rock CPL Cross polarized light CT Computed tomography FG Fangshan granite ISRM International Society for Rock Mechanics and Rock Engineering LVDT Linear variable differential transducer PPL Plane polarized light SEM Scanning electron microscopy UCS Uniaxial compressive strength n Porosity of rock specimen V v Pore volume of rock specimen (cm 3 ) V Bulk volume of rock specimen (cm 3 ) S r Degree of saturation (%) V w Volume of water (cm 3 ) f Ultimate shear stress (MPa) nor Normal stress (MPa) C Cohesion (MPa) Internal friction angle (°) F m Resisting stress of the meniscus effect w

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Section: Introductionmentioning

confidence: 99%

Effect of water content on the mechanical properties of an artificial porous rock

Jiang

Chen

et al. 2021

Bull Eng Geol Environ

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“…Heggheim et al [12] analyzed the softening of sandstone and examined the main factors that affected water-rock interaction, including sandstone particle changes, cement composition, pore morphology, and pore size. Sun et al [13] emphasized that the increase in moisture content would weaken rock strength and reduce the cumulative AE counts and cumulative energy during rockburst. Tutuncuet al [14] experimented the Berea sandstone immersed in different saturated solutions under the cyclic uniaxial stress condition and discussed the attenuation mechanism of the hysteresis loop in the deposited granular rock.…”

Section: State Of the Artmentioning

confidence: 99%

Damage Deformation and Acoustic Emission Characteristics of Raw Coal under Different Moisture Contents

Ren

Dong

2020

Teh. vjesn.

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Coal seam with different moisture contents considerably affects coal mining and gas extraction. The coal seam with moisture contents has unique damage deformation characteristics that differ from dry coal. Therefore, the damage deformation characteristics of coal seam with different moisture contents need to be investigated to enhance the effects of coal mining and gas extraction. To explore the damage and deformation laws and acoustic emission (AE) characteristics of coal samples with different moisture contents, coal samples with different moisture contents were prepared for triaxial compression AE localization tests, and the stress-strain characteristic parameters and AE counts, cumulative AE counts, AE energy, and cumulative AE energy of coal samples were prepared. The damage models of coal samples with different moisture contents were established based on AE counts, and the damage and deformation laws were analyzed. Results show that the peak intensities of coal samples decrease with the increase in moisture contents, the dry coal sample mainly undergoes shear failure, and the water-containing coal samples are pronounced by lateral splitting. The peak and cumulative AE counts of the coal samples decreased as the moisture contents increased. The peak and cumulative AE energies of coal samples decreased with the increase in moisture contents. The damage model established based on AE counts has a high degree of fit. Moreover, the damage amount of the coal samples increased with the moisture contents. The conclusions obtained in this study have practical guiding significance for demonstrating the mechanism and process of coal body dynamic disasters in actual engineering.

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“…However, the above research results did not explore the mutual conversion between the internal elastic energy, the dissipative energy, and the evolution of acoustic emission characteristics. Hu et al [15][16][17][18] carried out loading tests on hard rocks with boreholes, combined with the fracture form, energy dissipation, and acoustic emission characteristic parameters to analyze the rock burst process of hard rocks, and analyzed the effect of stress changes and water content around the borehole on hard rock bursts during the rock burst process. Only a single-hole experimental study was conducted in the above study.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Influence of Borehole Arrangement on Energy Conversion and Acoustic Characteristics of Coal-Like Material Sample

Hao

Hou

Xiao

et al. 2020

Shock and Vibration

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This paper examines the effects of borehole arrangement on the failure process of coal-like materials based on its energy conversion and acoustic characteristics from the perspectives of energy, AE energy, AE spectrum, and frequency band. Findings from the study revealed that the presence of borehole can significantly reduce the conversion ratio and growth rate of elastic energy during the loading of coal-like material sample and delay the release of internal energy of the sample. Also, it can reduce the frequency band energy of the main frequency of acoustic emission signal but has little effect on the size and richness of the peak frequency of acoustic emission signal. The practice that makes drilling diameter and depth increase stepwise can minimize the elastic energy conversion ratio, the growth rate, and the main frequency band energy of acoustic emission signal of coal-like material sample and postpone the internal energy release of the sample to the greatest extent, so as to enrich the richness of the secondary frequency of acoustic emission signal. The results of this study have certain guiding significance for the layout of pressure relief boreholes in the production process of coal mines.

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An experimental investigation on acoustic emission characteristics of sandstone rockburst with different moisture contents

Cited by 31 publications

References 30 publications

Effect of water content on the mechanical properties of an artificial porous rock

Effect of water content on the mechanical properties of an artificial porous rock

Damage Deformation and Acoustic Emission Characteristics of Raw Coal under Different Moisture Contents

Experimental Study on Influence of Borehole Arrangement on Energy Conversion and Acoustic Characteristics of Coal-Like Material Sample

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