The role of flaws on crack growth in rock-like material assessed by AE technique

Liu, Quansheng; Xu, Jie; Liu, Xuewei; Jiang, Junfeng; Liu, Bin

doi:10.1007/s10704-015-0021-6

Cited by 73 publications

(21 citation statements)

References 30 publications

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“…AE monitoring is useful for exploring the failure process and crack coalescence mechanism of brittle rocks, especially for awed rocks with preexisting ssures. Scholars analyzed the AE counts and AE energy of rock during the deforming and fracturing process [3,20]. Hence, these parameters were combined with the stress-strain curve to analyze the features of precracked specimen during seepage pressure-induced process and to identify the precursor features of rock damages.…”

Section: Ae Behaviors Of Precraked Sandstone Specimens Withmentioning

confidence: 99%

An Experimental Study on Cracking Behavior of Precracked Sandstone Specimens under Seepage Pressure

Lin

Cao

Wang

et al. 2018

Advances in Civil Engineering

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This paper aims to investigate the strength and failure mechanism of fractured rock under seepage pressure. For this purpose, precracked sandstone specimens were prepared with different fissure angles, and a seepage pressure loading device was created. Together with the acoustic emission (AE) system, the loading device was adopted to perform uniaxial compression tests with or without seepage pressure. The main results are as follows. Combined with axial stress-strain curves, photographic monitoring results and the output of AE counts and rock failure process can be generally divided into four stages: microcrack closure, elastic deformation, crack growth and propagation, and final failure. The seepage pressure had a significant effect on the mechanical properties of the specimens: the specimens under seepage pressure lagged far behind those without seepage pressure in peak strength but maintained a comfortable lead in peak strain. Under seepage pressure, the typical failure features of the specimens varied with the fissure angles: the specimens with small fissure angles (i.e., [0°,30°]) mainly underwent tensile failure; those with medium fissure angles (i.e., [30°,60°]) suffered from shear failure; and those with large fissure angles (i.e., [60°,75°]) were prone to tensile-shear failure.

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Section: Ae Behaviors Of Precraked Sandstone Specimens Withmentioning

confidence: 99%

An Experimental Study on Cracking Behavior of Precracked Sandstone Specimens under Seepage Pressure

Lin

Cao

Wang

et al. 2018

Advances in Civil Engineering

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“…Acoustic emission (AE) monitoring is a useful technique to capture the failure process of rocks [13,14]. Many researchers [15][16][17][18][19] analyzing the mechanical properties of coal and rock with different water content combined acoustic emission data.…”

Section: Introductionmentioning

confidence: 99%

Effects of Water-Soaking Height on the Deformation and Failure of Coal in Uniaxial Compression

et al. 2019

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The stability of water-preventing coal pillar plays an important role in preventing gob water inrush. The gob side of the water-preventing coal pillar is soaked in a certain height of mine water. Different soaking heights may affect the stability of coal pillars. Few studies have been conducted on the properties of coals with different water-soaking heights. We carried out uniaxial compressive tests on coal specimens with different water-soaking heights to gain a better understanding of different water-soaking-height-induced weakening characteristics of coal. Results show that: (1) The water content of coal specimens increases with the soaking height. Water significantly weakens the strength of coal specimens. However, the extent of strength weakening of the coal specimen does not increase with the increase of the soaked height. The strength of the fully soaked coal specimen is lowest among all groups of coal specimens. The strength of the three groups of partially soaked coal specimens is between the fully soaked coal specimens and the coal specimens without being soaked in the water. In the three groups of partially soaked coal specimens, the strength of the coal specimens increases with the increase of the soaking height. (2) The acoustic emission activities of complete water soaking and nonsoaking coal specimens are relatively concentrated, occurring mainly in unstable fracture expansion stage and post-peak destruction stage, and acoustic emission exhibits main-shock mode. Partially soaking coal specimens, especially the 25% water-soaking height and 50% water-soaking height coal specimens, produces obvious acoustic emission activities during the fracture expansion stabilization phase, and then generates more acoustic emission activities during the unstable expansion stage and the post-peak stage. The acoustic emission presents foreshock-main shock mode. (3) The softening effect of the water soaking on the coal specimens is obvious. It was further found that the deformation of coal specimens with partial water soaking is not synchronized in different layers, the nonuniform deformations of partially soaked coal specimens aggravate its damage.

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“…Zhang et al [22] studied the AE characteristics of rock-like material under different loading rates and obtained the effect of loading rate on acoustic emission signals. Liu et al [23] studied the initiation and propagation of cracks in the rock under pressure and made relevant assessments through the acoustic emission technique. Liu et al [24] studied the occurrence and failure mechanism of collapse columns through the numerical simulation of acoustic emission characteristics.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Acoustic Emission of Weakly Cemented Sandstone considering Bedding Angle

Wang

Yang

Zuo

2018

Shock and Vibration

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Uniaxial compression experiments and acoustic emission (AE) tests were conducted on weakly consolidated sandstone samples with bedding angle of 0 ∘ , 45 ∘ , and 90 ∘ collected from Xiaojihan coal mine in Shaanxi Province, China; the acoustic emission (AE) characteristics of bedding sandstone were investigated, including the influencing mechanism of bedding angle on characteristics, spatial distribution, and value changes of AE activity. According to the research, AE ringing counting rate and energy rate are the highest and energy release is intense during the loading process when the bedding angle is 0 ∘ , and these values decrease and the energy release is gentle with rising of the angle. Based on spatial distribution, the number of AE events was the largest and cluster phenomenon occurs between the bedding plane when the bedding inclination was 0 ∘ , which decreased and sprouted along the plane of bedding plane at 45 ∘ and which was smaller and evenly distributed in the space at 90 ∘ . With the increase of bedding angle, the proportion of large-scale microcracks decreases and the variation range of microcracks narrows down. Therefore, under the same uniaxial compression conditions, the value increases by the increase of bedding angle. The research results offer reliable reference to carry out monitoring work on acoustic emission and microseism of mine with layer rock (rock mass).

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The role of flaws on crack growth in rock-like material assessed by AE technique

Cited by 73 publications

References 30 publications

An Experimental Study on Cracking Behavior of Precracked Sandstone Specimens under Seepage Pressure

An Experimental Study on Cracking Behavior of Precracked Sandstone Specimens under Seepage Pressure

Effects of Water-Soaking Height on the Deformation and Failure of Coal in Uniaxial Compression

Experimental Study on Acoustic Emission of Weakly Cemented Sandstone considering Bedding Angle

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