Research on Damage and Acoustic Emission Properties of Rock Under Uniaxial Compression

Li, Xiaoming; Zhang, Dongming; Yu, Guoqing; Li, Haitao; Xiao, Weijing

doi:10.1007/s10706-021-01710-5

Cited by 13 publications

(10 citation statements)

References 3 publications

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“…The longitudinal strain was obtained by dividing the longitudinal displacement in the axial direction by the original diameter of the test specimen. Young’s modulus and Poisson’s ratio were determined from the slopes of the linear fits to the axial stress–axial strain and lateral strain–axial strain data, respectively. , …”

Section: Experiments and Methodsmentioning

confidence: 99%

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Relationship between Shale Hydration and Shale Collapse

et al. 2022

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Shale gas has become the major source of natural gas. However, shale is rich in clay and easily collapsed by water invasion. This not only causes collapse of the reservoir but also causes the loss of natural gas and can even cause local earthquakes and affect the safety of human beings. This paper describes an investigation of the relationship between hydration and collapse. Shale samples were obtained from a series of wells drilled in the lower Silurian Longmaxi Formation at a depth of 3500 m. The different hydrated shales were simulated to analyze the hydration−collapse relationship. Magnetic resonance analysis and mechanical analysis were combined to analyze the collapse of the hydrated shales. The collapse progression was found to follow an S-shaped growth curve that can be divided into three parts, namely, the potential period, the exciting period, and the mature period. The hydration state and degree of damage were determined from the magnetic resonance of water molecules. This paper proposes a mechanism for shale hydration collapse based on basal and numerical data that can be used to predict shale collapse as a function of hydration.

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Section: Experiments and Methodsmentioning

confidence: 99%

“…Young's modulus and Poisson's ratio were determined from the slopes of the linear fits to the axial stress− axial strain and lateral strain−axial strain data, respectively. 30,31 3.5. Finite Element Analysis.…”

Section: Collapse Behaviormentioning

confidence: 99%

Relationship between Shale Hydration and Shale Collapse

et al. 2022

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“…The macro and micro damage characteristics and evolution law of force chain and AE of rock specimens were studied. Li et al (2021) studied the acoustic emission characteristics of roof rock under uniaxial compression by using similar simulation test, and analyzed the acoustic emission characteristics, failure mode and energy damage mechanism in the progressive failure process. Wu et al (2015) analyzed the relationship between AE characteristics and stress, strain, damage variables under different failure modes of rocks.…”

Section: Introductionmentioning

confidence: 99%

Study on Failure Characteristics and Acoustic Emission Characteristics of Sandstone Under Variable Angle Shear

Luo

Guo

et al. 2022

Geotech Geol Eng

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To study the shear damage and failure characteristics of red sandstone under different normal stress conditions, the failure process of sandstone under three different shear angles (50°, 55°, 60°) were studied by using variable angle shear test device. The shear stress-deformation curves and failure characteristics of sandstone were obtained, and the relationships between shear cracks and acoustic emission impact times, amplitude, peak frequency were established. With the increase of shear angle, the normal stress, shear stress and peak shear stress decrease gradually. The development of micro-cracks in the shear plane appear more earlier. The high frequency signal decreases signi cantly, which may have a signi cant corresponding relationship with the rock friction and shear effect. The failure mode of rock changes from plasticity to brittleness. The amplitude changes are concave, and more acoustic emission energy is released at compaction stage and plastic(failure) stage. The rock spalling mainly occur in the penetrating area of main and secondary cracks surrounding the two ends of specimen. The spalling degree was obviously weakened with the increase of shear angle. The results have important guiding value for judging and predicting the instability mechanism of rock engineering.

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“…Liu et al [2] developed a coal-rock damage model based on the AE characteristics of coal-rock under uniaxial compression to reveal the damage evolution of coal-rock under load. Cao et al [3][4][5] conducted uniaxial compression tests on rock specimens, using ringing count, main frequency and entropy values of AE signals, and AE energy rate as main characteristic parameters to predict rock fracture. Wang et al [6] examined the rock critical fracture criterion and precursor characteristics based on the uniaxial compression AE test of granite.…”

Section: Introductionmentioning

confidence: 99%

Study on the Precursors of Coal-Rock Fracture Based on the Maximum Lyapunov Exponent of Acoustic Emission Parameters

Cheng

Sun

2022

Geofluids

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In this paper, the relationship between acoustic emission (AE) parameters and coal-rock fracture is investigated by using the discrete element particle flow simulation software PFC. PFC is used to simulate the coal-rock uniaxial compression test for extracting the time series of AE event number, calculate the maximum Lyapunov exponent of the time series, and analyze the chaotic characteristics of AE event number. Combined with the relationship between the maximum point of the Lyapunov exponent and the peak point of the stress-strain curve, the coal-rock fracture precursor model was developed. The results indicate that during the uniaxial compression of coal-rock, the number of AE events first increases and then decreases, while the maximum point appears after the peak point of the stress-strain curve. The lower the coal-rock homogeneity, the earlier is the initial occurrence time of AE events. The AE event number has chaotic characteristics. In most cases, the chaotic characteristics of the number of AE events are the most evident before the specimen is completely destroyed. When the maximum Lyapunov exponent of AE event number time series mutates, it indicates that the specimen is about to be destroyed entirely, which can be used as a precursor criterion for coal-rock fracture.

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Research on Damage and Acoustic Emission Properties of Rock Under Uniaxial Compression

Cited by 13 publications

References 3 publications

Relationship between Shale Hydration and Shale Collapse

Relationship between Shale Hydration and Shale Collapse

Study on Failure Characteristics and Acoustic Emission Characteristics of Sandstone Under Variable Angle Shear

Study on the Precursors of Coal-Rock Fracture Based on the Maximum Lyapunov Exponent of Acoustic Emission Parameters

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