Quantification and acoustic emission characteristics of sandstone damage evolution under dry–wet cycles

Zhang, Hexing; Lu, Kunpeng; Zhang, Wuzhou; Li, Dalang; Yang, Guosheng

doi:10.1016/j.jobe.2022.103996

Cited by 29 publications

(7 citation statements)

References 53 publications

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“…Zhao et al [11] discussed the relationship between the loading stress corresponding to the minimum average frequency centroid of AE signals and the peak stress during the deformation and failure process of red sandstone specimens. Zhang et al [12] concluded through their study that the variation pattern of AE energy is consistent with the rock's damage process in sandstone. In order to uncover the spatiotemporal correspondence between acoustic emission event signals and the generation and development of rock fractures, scholars have conducted in-depth research on the signals of acoustic emission events and the characteristics of rock damage.…”

Section: Introductionmentioning

confidence: 85%

Acoustic emission characteristic of sandstone and sandstone like material under multi-path loading

Zhuang,

Peng,

Zhao

et al. 2024

PLoS ONE

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Using spline interpolation to select proportions of similar materials, a comparative analysis of the fracturing behavior of sandstone specimens and similar material specimens was conducted through Brazilian splitting tests under multi-path loading. The study revealed that during stepwise loading, both sandstone and similar materials exhibited memory effects and plastic deformation. However, under constant velocity loading, the relationship between force and displacement in sandstone showed linearity after compaction. Employing MATLAB optimization algorithms for the inversion of acoustic emission event information, the distribution of fracture points, and the evolution of cracks were analyzed. The findings indicated that under stepwise loading, both sandstone and similar materials exhibited banded distribution of peak frequencies, with sandstone concentrated in the mid-low-frequency range and similar materials leaning towards the low-frequency range. The amplitude-frequency characteristics of acoustic emission signals suggested that initially, sandstone produced low-frequency, low-amplitude signals. As cracks developed, these signals gradually transformed into high-frequency, high-amplitude signals, ultimately leading to macroscopic failure. The ringing counts and b-values of sandstone displayed an approximate "W" shape distribution, with a subsequent decrease in b-values during final failure. In contrast, the acoustic emission counts were inversely related to b-values. Similar materials exhibited slightly more acoustic emission counts than sandstone, with relatively lower b-values. The crack development process of both sandstone and similar materials was confirmed through these observations. From the perspective of section initiation and local damage, sandstone and similar materials exhibited similar failure characteristics. The proportions of quartz sand: cement: water = 9:1:0.9 in similar materials demonstrated the most similar characteristics to sandstone in terms of mechanical loading, acoustic emission features, and failure morphology. This suggests that these similar materials can be used as substitutes for sandstone in analogous simulation experiments. The study provides theoretical support for understanding rock fracture mechanisms, offers guidance for the selection and proportioning of similar materials, and holds significance for predicting and controlling rock fracture behavior in engineering applications.

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Section: Introductionmentioning

confidence: 85%

Acoustic emission characteristic of sandstone and sandstone like material under multi-path loading

Zhuang,

Peng,

Zhao

et al. 2024

PLoS ONE

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“…Dry-wet cycles of rock causes microcracks to expand and propagate, resulting in a loss of strength and damage to the rock [47,50,51]. Long-term strength is mentioned in section 3.3 as a valid indicator of the evolution of the strength of samples as it deteriorates with dry-wet cycles.…”

Section: Damaged Elements By Dry-wet Cyclesmentioning

confidence: 99%

Investigation of shear creep experiments and modelling of mud-shale under dry-wet cycles of rainfall

Zhong,

Sheng,

et al. 2024

Phys. Scr.

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The analysis of the creep mechanical properties and the failure mechanisms of mud-shale in response to dry-wet cycles of rainfall are important for the slope stability of Permian limestone with carbonaceous mud-shale. In this paper, shear creep experiments were performed on mud-shale under different dry-wet cycles of rainfall. The classical viscoelastic-plastic creep model was improved and a modified creep model was developed to account for the damage of dry-wet cycles. The results showed that the creep deformation and the long-term strength of the mud-shale varied considerably with dry-wet cycles. In other words, dry-wet cycles had a notable effect on the creep properties of the mud-shale. According to the macroscopic continuum damage theory, the viscoelastic-plastic model was modified considering the damage of dry-wet cycles, which fitted the mud-shale creep curve reasonably well. It was found that there was a good consistency between theoretical predictions of modified model and the experimental dates, and its viscoelastic creep parameters were noted to show a good degradation characteristic with dry-wet cycles. It is indicates that the modified model could be reliably used to simulate and predict the complete creep process in mud-shale, and it also provides a great demonstration of the effect of dry-wet cycles on creep behavior. The model therefore enables a deeper understanding of the long-term stability of slope engineering projects.

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“…With the gradual enrichment of test methods, many achievements have been made on the influence of dry-wet cycles on rocks from a microscopic point of view. Zhang et al [14] and Guo et al [15] established the relationship between structural characteristics, fracture development trend, fractal dimension, and correlation dimension by analyzing the crack growth and acoustic emission characteristics of samples and studied the water weakening effect of dry-wet cycling on rocks. Based on the scanning electron microscope (SEM) test, Wang et al [16] proposed the concept of erosion degree of argillaceous sandstone under dry-wet cycles based on the analysis of mesoscopic images of rock samples with different dry-wet cycles and established the relationship between mesoscopic and macroscopic.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Pore Structure Evolution of Unloaded Rock Mass during Excavation of Reservoir Slope under Dry–Wet Cycle

Chen,

Gong

et al. 2024

Applied Sciences

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There is a long sequence of periodic characteristics of reservoir water storage and discharge in large hydropower stations. The unloaded rock mass formed by blasting and excavation in the reservoir slope of the reservoir fluctuation zone is not only subjected to the penetration erosion caused by the change of the water level of the reservoir slope, but also the dry–wet cycle caused by the reservoir water storage and discharge. There is an obvious process of crack derivation and pore structure expansion, and the subsequent strength degradation breeds reservoir slope risks, which is one of the important factors restricting the operation safety of power stations. To study the pore structure evolution law of unloaded rock mass in reservoir slope excavation of reservoir fluctuation zones, the dry–wet cycle test simulating the periodic storage and discharge environment was carried out with samples of equal unloading amount obtained by indoor triaxial unloading test. The variation law of mesoscopic parameters such as wave velocity, mass, and nuclear magnetic resonance spectrum under dry–wet cycle was compared and analyzed, and the physical and mechanical mechanism of the pore structure evolution of the unloaded specimen under dry–wet cycles was explored. The results show that: (1) With the increase of dry–wet cycles, the evolution of wave velocity and dry mass of unloaded samples has obvious stage characteristics, which generally presents a rapid change in the early stage, moderate in the middle stage, and gradually stable in the late stage; (2) nuclear magnetic resonance (NMR) shows that the number of macropore structures in unloaded samples increases gradually with the dry–wet cycles; (3) the smaller the initial confining pressure, the larger the first peak area and the peak value of unloaded samples, and the spectral area corresponding to each peak under low confining pressure is significantly larger than that under medium and high confining pressure; (4) the unloading amount affects the overall proportion of macropores in the sample, which determines the deterioration process and evolution law of the mesostructure of the sample under dry–wet cycles.

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Quantification and acoustic emission characteristics of sandstone damage evolution under dry–wet cycles

Cited by 29 publications

References 53 publications

Acoustic emission characteristic of sandstone and sandstone like material under multi-path loading

Acoustic emission characteristic of sandstone and sandstone like material under multi-path loading

Investigation of shear creep experiments and modelling of mud-shale under dry-wet cycles of rainfall

Experimental Study on Pore Structure Evolution of Unloaded Rock Mass during Excavation of Reservoir Slope under Dry–Wet Cycle

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