›› 2010, Vol. 31 ›› Issue (11): 3441-3446.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of aging failure mechanics and triaxial compression creep experiments with water pressure coupled stress of brittle rock

HUANG Shu-ling 1, 2，FENG Xia-ting1，ZHOU Hui1，ZHANG Chuan-qing1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China
  • Received:2009-09-18 Online:2010-11-10 Published:2010-11-24

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Abstract:

Based on triaxial compression rheological experiments with water pressure coupled stress about the Jinping marble from the deep site in Jinping II diversion tunnel, the aging deformation characteristics，isochronous curve and aging failure mechanics are discussed in detail. The test results show that: (1) Water pressure can enhance the aging deformation capacity of the marble, and the steady-state creep rate under water pressure is greater than that when there is not water pressure. (2) Stress strength ratio of crack dilate instability can be used as creep instability threshold of brittle rock, and when stress strength ratio reached this threshold, the probability of rock instability increased sharply with time to develop. (3) Volume creep value is greater than the lateral or axial creep value, which indicates that there is a distinguishing dilate creep feature of brittle rock. (4) Isochronous curves of brittle rock at different time have obvious similarities, and accelerating creep ago, the curves are linear, but in the event of acceleration creep, the curves are significantly non-linear characteristics.

Key words: water pressure coupled stress, brittle rock, triaxial creep, aging deformation and failure mechanics

CLC Number: 

  • TU 452
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