中文摘要：

为研究热-力作用下花岗岩的破裂规律,采用MTS815 Flex Test GT岩石力学试验系统和PCI-Ⅱ声发射仪开展了黑云母花岗岩在不同围压和不同温度作用下的三轴压缩试验。研究结果表明：在20℃,40℃和60℃的温度作用下,声发射事件的密集程度和声发射累计振铃计数以及最大AE能率随着温度的升高而增加,宏观破裂角逐渐减小,岩石的脆性破坏特征逐渐增强;在60℃,90℃和130℃的温度作用下,声发射事件的密集程度和声发射累计振铃计数以及最大AE能率随着温度升高而减小,宏观破裂角逐渐增大,岩石的剪切破坏特征逐渐增强;同时,随着温度升高,剪切破坏造成大量低能量释放率的声发射产生,声发射密集区表现为由小部分能量率很大的声发射和数量较多、低能量释放率的声发射组成。

英文摘要：

In order to study the failure law of granite under thermal action,a triaxial compression test of biotite granite 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 is60℃,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.