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Acoustic emission and damage characteristics of granite at high temperature

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Document pages: 12 pages

Abstract: Under the action of temperature and load, acoustic emission signals can be detected from rocks to reflect the damage evolution process of rocks and predict rock fracture. In this paper, the uniaxial compression test of granite at 25 ℃ ~ 1000 ℃ is carried out, and the acoustic emission signal is monitored synchronously. The results show that the counting rate of acoustic emission ring presents the laws of "intermittent explosion " and "relative calm ", which can be explained from the perspective of energy. From 25 ° C to 1000 ° C, the rock failure mode changes from single splitting failure to multi splitting failure, and then to incomplete shear failure, ideal shear failure and double shear failure, until complete overall failure. The thermal damage (DT) defined by the elastic modulus shows a logistic incrementase with the rise of temperature. Mechanical damage (DM) derived by the AE ring count rate can be divided into initial stage, stable stage, accelerated stage, and destructive stage. Total damage (D) increases with the rise of strain, which is corresponding to the stress-strain curve at various temperatures. Using AE data, we can further analyze the mechanism of deformation and fracture of rock, which helps to gather useful data for predicting rock stability at high temperatures.

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