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| A true triaxial time-dependent test system with two rigid and one flexible loading frame for rock under real-time high temperature and high#br#
pressure and its application |
| LIU Zaobao1，2，WANG Chuan1，2，ZHOU Hongyuan1，2，SHEN Wanqing1，2，SHAO Jianfu1，2 |
| (1. Key Lab of Ministry of Education on Safe Mining of Deep Metal Mines，Northeastern University，Shenyang，Liaoning 110819，China；2. Institute of Deep Engineering and Intelligent Technology，Northeastern University，Shenyang，Liaoning 110819，China) |
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Abstract In order to study the excavation response of deep underground engineering rock masses under high temperature and high-pressure conditions，a true triaxial rheological test system of the“two rigid and one flexible” type was independently developed for carrying out experiments on rocks under high temperature and high pressure. The system mainly includes two rigid stress loading components respectively for applying maximum principal stress() and intermediate principal stress()，a flexible stress loading system for applying minimum principal stress()，a temperature servo control system and some extensible parts. The rigid loading force in the directions of and is up to 2 000 kN and the maximum pressure of the flexible loading in the direction is 70 MPa. The system is designed for a standard rock sample with three edges respectively of 50 mm×50 mm×100 mm，and can perform various types of high-temperature stress loading tests such as true triaxial，creep，and cyclic loading and unloading. The system was used to study the strength and deformation characteristics of Beishan granite under high temperature(60 ℃，100 ℃，150 ℃，200 ℃) and high pressure(= 30 MPa，= 20 MPa) true triaxial loading conditions，and the true triaxial creep behaviour of Jinping marble under high-temperature conditions. The results show that the peak strength and elastic modulus of Beishan granite first increase and then decrease with increasing temperature，and the turning point appears at 150 ℃. The true triaxial creep curve of Jinping marble at 80 ℃ obviously exhibits the attenuation creep，stable creep and accelerated creep process. The system provides a new effective method for characterization of the true triaxial mechanical properties of rocks under coupled high temperature and high-pressure condition.
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2021, Vol. 40 
