20 MN大尺寸岩体三向五面试验系统研制与应用

doi:10.13722/j.cnki.jrme.2022.0552

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Abstract The YJW–20000S microcomputer-controlled hydraulic servo three-directional five-surface loading test system was jointly developed by Central South University and Shanghai Hualong Testing Instrument Co.，Ltd.，to expand the study on mechanical properties of large-scale rock-like materials under high stress conditions. The static and dynamical combination loading，single-face and multi-face unloading tests of large-scale rock specimens can be performed by this system to simulate the mechanical behavior of rock under complex stress conditions such as rock burst. The system?s functionality and accuracy were confirmed through true triaxial fatigue disturbance loading and unloading tests and three-directional five-surface tests on a 400 mm × 400 mm × 400 mm rock-like sample. Uniaxial compression tests on two kinds of large-scale granite specimens，viz. 400 mm × 400 mm × 400 mm and 400 mm × 400 mm × 800 mm，were carried out using this test system. The stress-strain curve characteristics，stress thresholds，size effects and end effects of large-scale granite specimens were analysed. The results show that the four stress thresholds of the large-size granite are the initial microcrack and microporous closure stress(0.37 )，crack-initiation stress(0.54 )，crack-damage stress(0.73 ) and peak strength( )，consistent with the theoretical prediction results of small-scale granite. The compressive strength value of large-scale granite specimen is smaller than the theoretical value based on the size-effect law. Additionally，the axial strain on the transverse section of the specimen?s side gradually decreases from the centre to both sides due to the end effect，and is lower than that in the middle of the specimen. The axial strain value near the side boundary surface of specimen increases with the distance from the end. The farther away from the end，the smaller the axial strain value on the longitudinal section near the centre of the sample's side. Overall，this system can provide reliable technology for in-depth research on the mechanical behavior of large-scale rock specimens under complex stress environments.

Key words： rock mechanics YJW&ndash 20000S three-direction five-sided loading test system testing machine classification large-size rock mass uniaxial compression end effect size effect

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	Articles by authors
	ZHAO Qingxiong1
	CAO Ping1
	LU Zhengqiang2
	LIN Hang1
	LIU Taoying1
	LI Kaihui1
	LIU Zhizhen1

Cite this article:

ZHAO Qingxiong1,CAO Ping1,LU Zhengqiang2, et al. Development of 20 MN large-scale rock mass three-direction five-surface#br# test system and its application[J]. , 2023, 42(8): 1847-1865.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0552 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I8/1847

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