Aging deterioration of mechanical properties on coal-rock combinations considering hydro-chemical corrosion

Chen, Wei; Liu, Jie; Peng, Wenqing; Zhao, Yanlin; Luo, Shilin; Wan, Wen; Wu, Qiuhong; Wang, Yuanzeng; Li, Shengnan; Tang, Xiaoyu; Zeng, Xiantao; Wu, Xiaofan; Zhou, Yu; Xie, Senlin

doi:10.1016/j.energy.2023.128770

Cited by 20 publications

(3 citation statements)

References 62 publications

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“…These indices will be used to quantitatively compare the degradation levels of uniaxial compressive strength for specimens with different α angles under the same loading rate and for specimens with the same α angle under different loading rates. Taking v = 3.0 mm/min and α = 45 • as an example, the expressions for Q (1) and Q (2) are Equations ( 1) and (2), respectively [19]:…”

Section: Deterioration Analysis Of Class Rock Specimensmentioning

confidence: 99%

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: Deterioration Analysis Of Class Rock Specimensmentioning

confidence: 99%

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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“…Currently, the research on the effects of water on mortar primarily focuses on the mixing water, such as the water content of mortar, the water-to-cement ratio, sand gradation, pH value of the water, and the effects of magnetized and electrolyzed water on the workability and strength of the mortar [2][3][4][5][6][7][8][9][10][11][12][13][14]. On the other hand, studies on the effects of environmental water on the mechanical properties of rocks are well-documented [15][16][17][18][19][20][21], which have pointed out that the action of water can reduce the strength and toughness of rocks. In terms of the impact of seawater, researchers such as Liu [22][23][24][25][26][27][28] have investigated the corrosion effects of sulfur-oxidizing bacteria, chloride ions, and seawater fluctuations on concrete, elucidating the patterns of change in concrete properties under seawater environments.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Environmental Water on the Mechanical Properties and Deterioration Process of Underground Engineering Masonry Mortar

Yang,

Cheng,

Cui

et al. 2024

Sustainability

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Urban underground engineering is generally buried at a shallow depth and suffers long-term environmental water effects such as rainfall, rivers, underground pipeline leakage, and groundwater. The mechanical properties of the structures are affected by constant deterioration, which seriously hinders the safe, healthy, and sustainable development of the city. On the basis of on-site investigation of civil defense engineering, this article simulates the water environment conditions of mortar in underground engineering in the laboratory and conducts manual sample preparation in the laboratory. Then, water, H2CO3, NaCl, and Na2CO3 solution or wet–dry cycles are used to corrode the sample, respectively. A uniaxial compression test, Brazilian splitting test, analyses of the acoustic emission signals and electromagnetic signals, and magnetic imaging testing are performed, respectively. The results show that an increase in the action time of environmental water leads to a gradual increase in the uniaxial compressive strength, tensile strength, and elastic modulus of cement mortar, but it will decrease over a long period of time. Different environmental water components can also lead to a different performance of soaked mortar. The uniaxial compressive strength R, tensile strength σt, and elastic modulus E of mortar samples exhibit values in different solutions in the order of H2CO3 solution < NaCl solution < Na2CO3 solution < water. A moderate solution soak time can enhance the mechanical properties of the mortar, but this effect decreases at long time scales. The effect of wet–dry cycles on the mechanical properties and degradation process of mortar is significant. With the increase in wet–dry cycles, the porosity of mortar continuously increases. The cumulative ringing count, energy, amplitude, and impact number of acoustic emission signals always increase when the samples are loaded to failure. The uniaxial compressive strength, tensile strength, and elastic modulus first increase and then decrease. The experimental results lay the foundation for further investigating the performance changes in mortar under complex water environments in underground engineering.

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“…Researching rockburst in fractured or faulted rock masses around deep tunnels [ 19 , 20 ], Amin Manouchehrian et al [ 21 ] showed that the presence of a fault near a tunnel could induce rockburst if the fault was positioned and oriented in such a way that it promoted high stress and low-mine system stiffness. Researching the impact of moisture content on rockburst in rock masses [ 22 ], S Luo et al [ 23 ] concluded that under uniaxial compression, the presence of water greatly degraded the peak strength, peak strain, and elastic modulus of the red sandstone. S Akdag et al [ 24 ] and Chen et al [ 25 ] conducted true triaxial experiments on various hard brittle rocks combined with SEM, discussing how differences in the intrinsic microstructure and fracture evolution in rocks were the primary factors leading to various rockbursts.…”

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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Aging deterioration of mechanical properties on coal-rock combinations considering hydro-chemical corrosion

Cited by 20 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 Study on the Effect of Environmental Water on the Mechanical Properties and Deterioration Process of Underground Engineering Masonry Mortar

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

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