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Resistivity and acoustic emission response characteristics of CGB failure process under uniaxial loading

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Document pages: 11 pages

Abstract: In order to understand the acoustic emission (AE) and resistivity characteristics of coal gangue cemented backfill (CGB) under uniaxial compression, the changes of these characteristics at 1, 3 and 7 days were analyzed by stress-strain resistivity (AE) test, and its micro properties were studied. The results show that acoustic emission can reflect the crack initiation and propagation, and then explain the change of resistivity under uniaxial loading. The cumulative energy curve of acoustic emission is similar to the two straight lines corresponding to the peak stress. Due to the low content of pore solution and dense pore structure, the difference of linear slope decreases gradually with the increase of curing time. relationshipnships between the stress and resistivity and the loading condition before and after the peak stress at different curing times were established. Therefore, it is of great significance to predict the stability of the filling body by monitoring the AE and resistivity variations of the filling body. In addition, it is possible to calculate the roof stress using the relation equation between the resistivity and stress.

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