Abstract In order to study the failure law of granite under thermal action, a triaxial compression test of biotitegranite under different confining pressures and different temperatures was carried out using the rock mechanics testing system MTS815 Flex Test GT and the PCI-II acoustic emission (AE) detector. The results show that: (1) when the temperature is 20℃, 40℃, or 60℃, the intensive degree of acoustic emission events, AE accumulative ringing counts, and the maximum AE energy rate increase with a rising temperature, and the macroscopic rupture angle decreases with an increase of the brittle failure characteristics of the rock; (2) when the temperature is 60℃, 90℃, or 130℃, the intensive degree of acoustic emission events, AE accumulative ringing counts, as well as the maximum AE energy rate decrease with a rising temperature, and the macroscopic rupture angle increases with the increase of the shear failure characteristics of the rock; meanwhile, (3) as the temperature increases, the large number of acoustic emissions with low energy release rates emerges with the local shear failure, and the concentrated acoustic emission area is characterized by a few acoustic emissions with a high-energy rate and a high number of acoustic emissions with a low-energy rate.
Abstract：
In order to study the failure law of granite under thermal action, a triaxial compression test of biotitegranite under different confining pressures and different temperatures was carried out using the rock mechanics testing system MTS815 Flex Test GT and the PCI-II acoustic emission (AE) detector. The results show that: (1) when the temperature is 20℃, 40℃, or 60℃, the intensive degree of acoustic emission events, AE accumulative ringing counts, and the maximum AE energy rate increase with a rising temperature, and the macroscopic rupture angle decreases with an increase of the brittle failure characteristics of the rock; (2) when the temperature is 60℃, 90℃, or 130℃, the intensive degree of acoustic emission events, AE accumulative ringing counts, as well as the maximum AE energy rate decrease with a rising temperature, and the macroscopic rupture angle increases with the increase of the shear failure characteristics of the rock; meanwhile, (3) as the temperature increases, the large number of acoustic emissions with low energy release rates emerges with the local shear failure, and the concentrated acoustic emission area is characterized by a few acoustic emissions with a high-energy rate and a high number of acoustic emissions with a low-energy rate.
ZHANG Hang,
LI Tian-Bin,
CHEN Guo-Qing etc
.Acoustic Emission Characteristics of Granite in a Triaxial Compression Test at Different Temperatures[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(5): 33-40
2014, Vol. 51 