Acoustic emission and electromagnetic radiation of rock under combined compression-shear loading

This paper reports the use of inclined sandstone specimen in the uniaxial compression tests to achieve the combined compression and shear loading (CCSL) state. A series of CCSL tests are performed on the inclined specimens with an inclination angle of 0°, 3°, 5°, and 7°. Acoustic emission (AE) and e...

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Bibliographic Details
Published inJournal of applied geophysics Vol. 226; p. 105415
Main Authors Zhang, Junwen, Chen, Yulong, Fang, Weiqi, Dong, Yuwei, Song, Zhixiang
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2024
Subjects
Acoustic emission
Combined compression-shear
Electromagnetic radiation
Inclined specimen
Stress drop
Acoustic emission
Electromagnetic radiation
Combined compression-shear
Stress drop
Inclined specimen
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ISSN0926-9851
1879-1859
DOI10.1016/j.jappgeo.2024.105415

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Summary:This paper reports the use of inclined sandstone specimen in the uniaxial compression tests to achieve the combined compression and shear loading (CCSL) state. A series of CCSL tests are performed on the inclined specimens with an inclination angle of 0°, 3°, 5°, and 7°. Acoustic emission (AE) and electromagnetic radiation (EMR) during the failure process are monitored. The results show that the additional shear stress component caused by the inclined shape configuration of tested specimens has significant effects on the failure mode and mechanical properties. The increase of inclination causes the failure mode to transit from the axial splitting to shear failure, and decreases the peak strength and elastic modulus of the inclined specimens. The specimen inclination lowers the damage prior to the peak stress, but stimulates the damage development after the peak stress. EMR has better correlation with stress drop than AE. The 65% of the peak strength is defined as the stress threshold of rock failure. The inclination angle lowers stress threshold of rock failure and accelerates failure initiation •Inclined rock specimens are uniaxially compressed to fulfill the combined compression and shear loading.•Inclination angle effect on the mechanical properties of inclined rock specimens is studied.•AE and EMR responses during failure process are analyzed.•Damage evolution of the inclined rock specimen is described based on AE and EMR parameters.•Correlations between AE and EMR and stress drop are quantitatively evaluated
ISSN:0926-9851
1879-1859
DOI:10.1016/j.jappgeo.2024.105415