Experimental investigation of the fracture and damage evolution characteristics of flawed coal based on electric potential and acoustic emission parameter analyses

Zang, Zesheng; Li, Zhonghui; Niu, Yue; Yin, Shan

doi:10.1016/j.engfracmech.2023.109740

Cited by 27 publications

(1 citation statement)

References 52 publications

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“…The analysis of the acoustic emission characteristics can obtain the evolution law of coal damage and crack extension. ,− The emission signals recorded in the indoor test were processed to obtain the acoustic emission ringing count rate at different loading moments. Figure shows the evolution of the acoustic emission ringing count rate at different loading moments.…”

Section: Resultsmentioning

confidence: 99%

Damage Evolution Characteristics and Constitutive Model for Coal and Rock under Asymmetric Loading

Wang,

Zhao,

Zhang

et al. 2024

ACS Omega

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Tunnels and shaft mining roadways are often subjected to varying degrees of asymmetric loading due to terrain relief or project excavation. In order to analyze the influence of the asymmetric degree of loading on the mechanical properties and damage rupture law of coal rock, uniaxial compression tests of coal rock under four asymmetric loading modes were carried out, the influence of the asymmetric coefficients of loading on macro- and micromechanical properties of coal and rock was analyzed, and a statistical damage constitutive model of coal and rock was established to reflect the asymmetric loading degree. The results of the study show that the peak stress of the coal rock decreases gradually with the increase in the asymmetric coefficient of loading, and the two are linear functions of each other. The distribution of the acoustic emission ringing count peak value is concentrated under uniform loading, while the acoustic emission ringing count rate presents a multipeak phenomenon under asymmetric loading, and the peak value points are scattered. In the case of asymmetric loading, the stress concentration on the edge of the upper loading plate leads to shear failure, and the microscopic cracks are concentrated near the interface between the loading zone and the nonloading zone. According to the established damage constitutive model, when the damage degree is the same, the larger the asymmetric coefficient, the smaller the strain value, which indicates that the asymmetric loading promotes the damage of coal and rock.

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