Lateral deformation and acoustic emission characteristics of dam bedrock under various river flow scouring rates

Wei, Chen; Liu, Jie; Liu, Wei; Peng, Wenqing; Zhao, Yanlin; Wu, Qiao; Wang, Y; Wan, Wen; Li, Shengnan; Peng, Huihua; Zeng, Xian‐Tao; Wu, Xiaofan; Zhou, Yu; Xie, Shengrong

doi:10.1016/j.jmrt.2023.08.050

Cited by 11 publications

(2 citation statements)

References 62 publications

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“…Furthermore, it is observed that these values vary with the fissure angle α, although there is some degree of dispersion in the results. Overall, there is a decreasing trend in the peak stress corresponding to strain values with the gradual increase in the loading rate [20]. erty damage.…”

Section: Effect Of Loading Rate On Strain As Well As Modulus Of Elast...mentioning

confidence: 94%

Analysis of the Effect of Loading Rate on Mechanical Properties of Fissured Rock Materials and Acoustic Emission Characteristic Parameters

Liu,

Wang,

et al. 2024

Buildings

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In nature, rock masses often exhibit fissures, and varying external forces lead to different rates of loading on fissured rock masses. By studying the influence of the loading rate on the mechanical properties of fractured rock mass and AE characteristic parameters, it can provide a theoretical basis for the safety and stability prediction of engineering rock mass. To investigate the influence of loading rates on fissured rock masses, this study utilizes surrogate rock specimens resembling actual rock bodies and prefabricates two fissures. By conducting uniaxial compression acoustic emission tests at different loading rates, the study explores changes in their mechanical properties and acoustic emission characteristic parameters. Research findings indicate the following: (1) Prefabricated fissures adversely affect the stability of specimens, resulting in lower strength compared to intact specimens. Under the same fissure inclination angle, peak strength, elastic modulus, and loading rate exhibit a positive correlation. When the fissure inclination angle varies from 0° to 60° under the same loading rate, the peak strength of specimens generally follows a “V”-shaped trend, decreasing initially and then increasing, with the minimum peak strength observed at α = 30°. (2) Prefabricated fissure specimens primarily develop tensile cracks during loading, gradually transitioning to shear cracks, ultimately leading to shear failure. (3) The variation patterns of AE (acoustic emission) characteristic parameters under the influence of loading rate differ: AE event count, AE energy, and cumulative AE energy show a positive correlation with loading rate, while cumulative AE event count gradually decreases with increasing loading rate. (4) AE characteristic parameters exhibit good correlation with the stress–strain curve and can be divided into four stages. The changes in AE characteristic parameters correspond to the changes in the stress–strain curve. With increasing loading rate, AE signals in the first three stages gradually stabilize, focusing more on the fourth stage, namely the post-peak stage, where the specimens typically experience maximum AE signals accompanying final failure.

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Section: Effect Of Loading Rate On Strain As Well As Modulus Of Elast...mentioning

confidence: 94%

Analysis of the Effect of Loading Rate on Mechanical Properties of Fissured Rock Materials and Acoustic Emission Characteristic Parameters

Liu,

Wang,

et al. 2024

Buildings

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“…These disasters threaten the safety of construction personnel, disrupt construction progress, and shorten equipment lifespan, posing a significant limitation to deep tunnel construction [ 9 ]. Extensive engineering research shows that rockbursts happen in arid regions, while natural rock masses have joint fissures [ 10 , 11 , 12 ]. Understanding the deformation and failure traits of such rock masses’ underwater influence is crucial [ 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Influence of Water on Rockburst in Rock-like Material with Voids and Multiple Fractures

Liu,

Li,

Peng

et al. 2024

Materials

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To investigate the influence of water content on the rockburst phenomena in tunnels with horizontal joints, experiments were conducted on simulated rock specimens exhibiting five distinct levels of water absorption. Real-time monitoring of the entire blasting process was facilitated through a high-speed camera system, while the microscopic structure of the rockburst debris was analyzed using scanning electron microscopy (SEM) and a particle size analyzer. The experimental findings revealed that under varying degrees of water absorption, the specimens experienced three stages: debris ejection; rockburst; and debris spalling. As water content increased gradually, the intensity of rockburst in the specimens was mitigated. This was substantiated by a decline in peak stress intensity, a decrease in elastic modulus, delayed manifestation of pre-peak stress drop, enhanced amplitude, diminished elastic potential energy, and augmented dissipation energy, resulting in an expanded angle of rockburst debris ejection. With increasing water content, the bond strength between micro-particles was attenuated, resulting in the disintegration of the bonding material. Deformation failure was defined by the expansion of minuscule pores, gradual propagation of micro-cracks, augmentation of fluffy fine particles, exacerbation of structural surface damage akin to a honeycomb structure, diminishment of particle diameter, and a notable increase in quantity. Furthermore, the augmentation of secondary cracks and shear cracks, coupled with the enlargement of spalling areas, signified the escalation of deformation failure. Simultaneously, the total mass of rockburst debris gradually diminished, accompanied by a corresponding decrease in the proportion of micro and fine particles within the debris.

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Uniaxial compression mechanical properties and deterioration mechanism of sandstone under different humidity conditions

Wu,

Yang,

Zhang

et al. 2023

J. Cent. South Univ.

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Lateral deformation and acoustic emission characteristics of dam bedrock under various river flow scouring rates

Cited by 11 publications

References 62 publications

Analysis of the Effect of Loading Rate on Mechanical Properties of Fissured Rock Materials and Acoustic Emission Characteristic Parameters

Analysis of the Effect of Loading Rate on Mechanical Properties of Fissured Rock Materials and Acoustic Emission Characteristic Parameters

Experimental Investigation on the Influence of Water on Rockburst in Rock-like Material with Voids and Multiple Fractures

Uniaxial compression mechanical properties and deterioration mechanism of sandstone under different humidity conditions

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