Experimental Study on Mechanical Properties and Acoustic Emission Characteristics of Water Bearing Sandstone under Stable Cyclic Loading and Unloading

Qin, Xinzhan; Zhou, Yu; He, Manchao

doi:10.1155/2020/9472656

Cited by 5 publications

(4 citation statements)

References 33 publications

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“…When the rock was in the elastic stage, the acoustic emission ring count entered a brief stable period. As the load increased beyond the previous target stress level, the acoustic emission ring count showed an increasing trend and exhibited a pronounced Kaiser effect [10]. When the rock reached its peak strength, the acoustic emission signals became dense, with a maximum ring count of 3745 and an acoustic emission energy of 3.0 × 10 8 .…”

Section: Acoustic Emission Ring Count and Energy Count Characteristic...mentioning

confidence: 97%

“…Liu et al [9] studied the mechanical properties of sandstone under triaxial cyclic loading and used the cumulative dissipated energy damage variable theory to analyze the increase in the damage variable with the increase in cyclic loading stress. Qin et al [10] studied the mechanical properties and acoustic emission characteristics of sandstone under cyclic loading and unloading, finding that an increase in the number of cycles improved the elastic modulus of rocks with a gradual decrease in the Felicity ratio. Zou et al [11] investigated the energy evolution laws of hexagonal honeycomb structures under different graded cyclic loading and unloading patterns, reflecting the exacerbation of internal rock damage with increased upper and lower bounds of cyclic loading and unloading.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Energy Evolution and Acoustic Emission Characteristics of Rocks under Cyclic Loading and Unloading

Wang,

Yang,

et al. 2023

Applied Sciences

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This paper presents two experimental schemes, graded cyclic loading and unloading, and variable lower limit cyclic loading and unloading, to investigate the energy evolution and acoustic emission characteristics of rocks under different cyclic loading and unloading paths. The experiments were conducted using a WAW-300B microcomputer-controlled hydraulic servo universal testing machine and an AMSY-6 acoustic emission testing instrument. The evolution characteristics of both the acoustic emission ring count and energy count during the loading process were monitored in real-time, and the energy evolution and damage status of the rocks in each cycle were inferred from the stress–strain curve. The results show that: (1) under both types of cyclic loading and unloading paths, the elastic energy, dissipative energy, and total energy of the rocks are positively correlated with the number of cycles; (2) through comparative analysis of the energy dissipation rate and storage rate, it is concluded that the gradual accumulation of dissipative energy ultimately leads to rock failure; (3) based on the energy dissipation method, the study reveals that rock damage is more severe under the variable lower limit cyclic loading and unloading path; (4) under both types of cyclic loading and unloading, the acoustic emission ring count exhibits the Kaiser effect, and Felicity is negatively correlated with the number of cycles. This holds significance in comprehending the behavior of rock deterioration and forecasting its state of destruction.

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Section: Acoustic Emission Ring Count and Energy Count Characteristic...mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Analysis of Energy Evolution and Acoustic Emission Characteristics of Rocks under Cyclic Loading and Unloading

Wang,

Yang,

et al. 2023

Applied Sciences

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“…Lavrov [6] studied the effect of the loading rate on rocks in complex stress paths and found that the acoustic emission activity of rocks was intense at high loading rates. Jiang et al [7] conducted experiments on the stress-strain relationship and acoustic emission characteristics of dense granite and marble under different loading rates and revealed the effects of the loading rate on stones. Cong Yu et al [8] studied the fracture morphology and cracked extension of rocks by constructing the specimen geometry, contacting intrinsic formation interaction, and iterative analysis to make the macroscopic mechanical properties of numerical specimens close to those of natural materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Loading Rate on the Mechanical Properties of Weakly Cemented Sandstone

Sun

Long

Li³

et al. 2023

Sustainability

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Weakly cemented rocks are characterized by low strength, loose structure, and easy disintegration. High-intensity mining activities can damage and rupture such rock bodies and induce damage, such as flaking and roofing on roadways. To reveal the mining intensity influence on the weakly cemented rocks’ deformation and damage, a numerical particle flow model of weakly cemented sandstone was established based on particle flow theory. Uniaxial compression simulation tests were conducted at four loading rates of 0.01, 0.1, 0.5, and 1 mm/min to study the weakly cemented sandstone’s stress–strain relationship, damage rupture, acoustic emission, and energy evolution. The results show that, with an increased loading rate, the uniaxial compressive strength of weakly cemented sandstone increases exponentially, and the rupture mode transforms from brittle damage to ductile damage; the greater the loading rate, the greater the degree of damage and crushing range of the rock. Further, with an increased loading rate, the peak hysteresis of rock acoustic emission events decreases, and the number of events increases; the energy accumulated in the rock increases, thus intensifying the degree of rock damage. Therefore, the possibility of engineering disasters should be considered when conducting high-speed underground mining activities.

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“…Zhang et al [13] pointed out AE activities could be divided into compaction and elastic deformation, non-elastic deformation and fracturing failure phase and proposed a new damaged model to describe the coal damage. Qin et al [14] carried out the uniaxial compression mechanical and AE tests of rock samples with different moisture content and clarified the influence of moisture content on AE characteristics. Teng et al [15] analyzed the mechanical and AE characteristics of dry and saturated sandstone under different loading rates.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Confined-Pressure Soaking on Sandstone Damage-Fracture Characteristics Using Acoustic Emission and Energy Dissipation

2022

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In order to explore the mechanical characteristics of confined-pressure soaking (CPS) sandstone during the damage-fracture process, the uniaxial compression and acoustic emission (AE) experiment of CPS sandstone was conducted. The mechanical parameters, fracture morphology, AE and energy characteristics under uniaxial stress were researched. The results show that the uniaxial compressive strength and elastic modulus decrease as a logarithmic function with CPS parameters, corresponding to the inflection point of modification. The fracture mode gradually changes from brittleness to toughness with the increase in moisture content. The difference between fracture fragmentation and mechanical behavior mainly depends on the degree of CPS. The evolution of AE characteristics and energy dissipation has a good correspondence with CPS specimens. The higher the CPS degree is, the less the AE cumulative number is and the longer the excitation time is. Based on the phase variation of AE events and energy dissipation, the CPS damage variables are proposed to quantify the weakening degree and reveal the damage evolution process. The results provide a useful foundation for evaluating rock failure and improving service life.

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Experimental Study on Mechanical Properties and Acoustic Emission Characteristics of Water Bearing Sandstone under Stable Cyclic Loading and Unloading

Cited by 5 publications

References 33 publications

Analysis of Energy Evolution and Acoustic Emission Characteristics of Rocks under Cyclic Loading and Unloading

Analysis of Energy Evolution and Acoustic Emission Characteristics of Rocks under Cyclic Loading and Unloading

Effect of Loading Rate on the Mechanical Properties of Weakly Cemented Sandstone

Experimental Study of Confined-Pressure Soaking on Sandstone Damage-Fracture Characteristics Using Acoustic Emission and Energy Dissipation

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