On Acoustic Emission and Post-peak Energy Evolution in Beishan Granite Under Cyclic Loading

Zhou, Hongwei; Wang, Z. H.; Wang, C. S.; Liu, J. F.

doi:10.1007/s00603-018-1614-y

Cited by 64 publications

(24 citation statements)

References 16 publications

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“…Li et al 33 analyzed the AE characteristics of gas-bearing raw coal samples under different stress path loading conditions using triaxial compression. Zhou et al 34 carried out experiments on the AE characteristics of Beishan granite under controlled methods of cyclic loading and unloading. Su et al 35 analyzed coal samples’ microstructure after natural cooling at different high temperatures and the deformation, strength, and AE characteristics during uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Briquette Coal Sample Mechanics and Acoustic Emission Characteristics under Different Binder Ratios

Meng

Yang

et al. 2021

ACS Omega

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In order to find briquette coal with mechanical characteristics close to those of raw coal samples, we conducted triaxial compression experiments on raw coal and briquette coal samples with different proportions of cement contents. The mechanical characteristics and acoustic emission (AE) characteristics of the coal samples in the triaxial compression process were analyzed in detail. The test results show that the evolution of deformation and strength characteristics of the briquette coal and raw coal samples follow certain common laws. The confining pressure can improve the mechanical properties of both types of coal samples: as the confining pressure continues to increases according to the set values, the elastic modulus, peak strain, and peak strength of both samples show an increasing linear trend. When the value of the confining pressure setting was the same, the compressive strength of the raw coal samples exceeded that of briquette ones, but the deformation and shape variations of the latter exceeded those of the former. When performing triaxial compression experiments on both kinds of coal samples, the AE amplitude and counts showed a close correlation with the stress evolution curves. When the confining pressure was set to 5 MPa, 20% cement content briquette coal was seen to be the closest to raw coal samples regarding mechanical and AE characteristics.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Briquette Coal Sample Mechanics and Acoustic Emission Characteristics under Different Binder Ratios

Meng

Yang

et al. 2021

ACS Omega

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“…As a natural material, rocks contain microcracks. It has been widely recognized that the growth of microcracks associated with crack propagation and coalescence can ultimately cause crystalline rock failure [4][5][6][7][8][9][10][11][12][13][14][15][16]. Wawersik and Brace conducted compression experiments on Westerly granite, indicating that at low confining pressure faulting in granite occurs only in the post-failure region beyond the peak of the stress-strain curves [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Mechanical Properties and Deformation Behavior of Beishan Granite considering Heterogeneity

Wang

Tan

Li³

et al. 2021

Advances in Civil Engineering

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Disposal of high-level radioactive waste (HLW) deep underground is one of the most challenging research subjects in rock engineering. In China, Beishan granite is usually chosen as host rock for the construction of the HLW repository. In this study, mechanical tests are conducted on Beishan granite and the stress-strain state during the complete failure process is analyzed by numerical simulation. The results show that the tensile strength and uniaxial compressive strength of Beishan granite are 8.66 and 162.9 MPa, respectively. Dilatancy appears when the stress reaches about 81% of the peak strength. Heterogeneity is introduced by Weibull distribution in numerical simulation. With the increase of homogenization degree, the degraded elements are more easily to concentrate locally. Based on experimental and numerical simulation results, it is noticeable that the sample volume is basically in the state of compaction before reaching the peak strength. The elements are more likely to show expansion, and the splitting failure dominates the destroy mode when the confining pressure is relatively low. With increasing confining pressure, more and more degraded elements are concentrated in the shear band, which develops from the surface to the interior of the sample during loading. Therefore, the granite shows ductile mechanical response characteristics when the confining pressure is relatively high. The results are instructive for the construction of the repository.

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“…The cyclic loading acts on the surrounding rock constantly, and causing a hazard to the safe and stable operation of the disposal repository. And, cyclic loading provide an effective way for better investigating rock damage and deformation characteristics (Zhou et al, 2019). The research on the mechanical behavior of granite under cyclic loading has a long history, and a series of achievements have been obtained.…”

Section: Introductionmentioning

confidence: 99%

“…AE signal can also reflect the crack propagation under unloading process, under lower stress level, no AE signal can be monitored after unloading; however, AE signal can be monitored in the whole unloading process under higher stress level (Jiang et al, 2017). The propagation of crack can be divided into different stages, and the differences can be successfully identified according to the AE hits and AE events (Zhou et al, 2019). X-ray micro-CT, P-wave and photomicrographs were also used to investigate the effect of cyclic loading, and more branch crack can be observed in the specimen under cyclic loading than monotonic loading (Yang et al, 2015(Yang et al, , 2017a.…”

Section: Introductionmentioning

confidence: 99%

Failure Behavior of the Thermal Treated Granite under Triaxial Cyclic Loading-unloading Compression

Tian

Yang

Wang

et al. 2020

Preprint

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The failure behavior of thermal treated granite under triaxial tiered cyclic loading-unloading compression has a significant effect on the safe and stable operation of HLW disposal repository. Therefore, the stress-strain curves, elastic modulus, Poisson's ratio, plastic strain, dissipated energy and failure characteristic of the thermal treated granite specimens under triaxial compression were analyzed by experiment and numerical simulation. The results indicate that the elastic, Poisson's ratio, axial plastic strain, dissipated energy and accumulative AE counts slightly increase with cyclic loading at initial loading and elastic deformation stage when T = 25 and 300°C, which means that less damage was induced by cyclic loading. However, damage occurred once cyclic loading was applied when T = 600°C. Radial strain even showed compressive characteristic in the initial stage, which indicates that grains adjustment occurred under triaxial cyclic loading-unloading compression. And, the compressive characteristic is more obvious with the increase of temperature or the decrease of confining pressure. The failure modes under triaxial cyclic loading are more complicated than that under triaxial monotonic loading, which make the shear plane rougher. Therefore, the residual strength is higher than that under monotonic loading. When T = 600°C, micro-crack continuously increases under uniaxial unloading and loading process, which result in a decrease of the peak strength under cyclic loading compared with that under monotonic loading.

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On Acoustic Emission and Post-peak Energy Evolution in Beishan Granite Under Cyclic Loading

Cited by 64 publications

References 16 publications

Experimental Study on Briquette Coal Sample Mechanics and Acoustic Emission Characteristics under Different Binder Ratios

Experimental Study on Briquette Coal Sample Mechanics and Acoustic Emission Characteristics under Different Binder Ratios

Experimental and Numerical Study on Mechanical Properties and Deformation Behavior of Beishan Granite considering Heterogeneity

Failure Behavior of the Thermal Treated Granite under Triaxial Cyclic Loading-unloading Compression

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