Mechanical and damage properties of coal specimens considering the impact and cyclic loading

Wu, Haoshuai; Chen, Yanlong; Pu, Hai; Bai, Haibo; Zhang, Kai

doi:10.1007/s40948-022-00366-6

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…Many studies have shown that engineering rocks are often subjected to repeated loading and unloading of external stresses; thus, it is important to study the damage mechanisms of rocks under cyclic loading and unloading conditions 21 – 23 . Numerous studies have been conducted on the strength characteristics and deformation damage mechanisms of rocks under cyclic loading and unloading conditions 24 .…”

Section: Introductionmentioning

confidence: 99%

Effect of fissure angle on energy evolution and failure characteristics of fractured rock under uniaxial cyclic loading

Zhao

Zhang

et al. 2023

Sci Rep

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To study the influence of fissure angle on the rock damage process and energy evolution characteristics, uniaxial cyclic loading and unloading tests were conducted on fractured rock specimens with different prefabricated fissure angles. The stress–strain curves, mechanical properties, and failure characteristics were analyzed. Subsequently, the energy evolution characteristics and failure mechanisms were investigated. The results showed that the stress–strain curves of fractured specimens fluctuated in the pre-peak phase and rapidly declined in post-peak phase. The peak stresses and strains of fractured specimens initially decreased and then increased with an increase in the fissure angle, whereas the elastic modulus first increased and then decreased. With an increase in the fissure angle, specimen failure changed from shear damage to tensile damage. The input, elastic, and dissipation energies of fractured specimens non-linearly increased with an increase in cyclic loading and unloading. As the number of cycles increased, the energy density decreased in segments with an increase in the fissure angle, and there was a rapid increase in the dissipation energy density before failure occurred. The results can provide a reference for the study of fractured rock failures and their prevention and control design in the field.

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Section: Introductionmentioning

confidence: 99%

Effect of fissure angle on energy evolution and failure characteristics of fractured rock under uniaxial cyclic loading

Zhao

Zhang

et al. 2023

Sci Rep

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Physical Similarity Simulation of Closely Stacked Coal Seams Mined in Faulted Geological Environments: A Comprehensive Experimental Investigation

Zhao,

Kong,

et al. 2024

Energy Science & Engineering

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The mining of closely stacked coal seams can be associated with complex stress fields, which makes mining difficult. In addition, closely stacked coal seams often coexist with faults and confined aquifers, further complicating mining activities. However, the study of closely stacked coal seams under complex geological conditions with faults (confined water) is very rare. In this study, an experimental approach was adopted to investigate the stress field and displacement field in rocks associated with closely stacked coal mining activity (complex geological conditions with faults and confined water). The materials used in the laboratory had similar physical properties to those present in the mining environment. The results showed that the overlying rock structure has three structural types and three caving forms. When the lower coal seam is mined, the collapse of the overlying strata is characterized by “caving with digging,” “no obvious periodic pressure step,” and “it is difficult to form a beam structure.” Faults function as a stress barrier, which makes it difficult for abutment pressure to cross a fault zone and form a stress concentration near the fault zone. When mining in faulted strata with confined water, there are three areas prone to water inrush, namely near the intersection with the fault zone and coal pillar, the boundary between the coal pillar and goaf, and the middle of the goaf. The research results are of great significance to the mining of closely stacked coal seams under complex geological conditions.

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Microcracking evolution and clustering fractal characteristics in coal failure under multi step and cyclic loading

Wang,

Liu

et al. 2024

Engineering Fracture Mechanics

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Mechanical and damage properties of coal specimens considering the impact and cyclic loading

Cited by 5 publications

References 25 publications

Effect of fissure angle on energy evolution and failure characteristics of fractured rock under uniaxial cyclic loading

Effect of fissure angle on energy evolution and failure characteristics of fractured rock under uniaxial cyclic loading

Physical Similarity Simulation of Closely Stacked Coal Seams Mined in Faulted Geological Environments: A Comprehensive Experimental Investigation

Microcracking evolution and clustering fractal characteristics in coal failure under multi step and cyclic loading

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