›› 2010, Vol. 31 ›› Issue (1): 46-50.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Influence of time-delay on Kaiser effect of rock under Brazilian tests

XIE Qiang1, 2，YU Xian-bin3，Carlos Dinis da Gama2   

  1. 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Centro de Geotecnia, Instituto Superior Técnico, Universidade Técnica de Lisboa, Lisbon 1049-001, Portugal; 3. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
  • Received:2008-05-29 Online:2010-01-10 Published:2010-02-02

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Abstract:

The existence of Kaiser effect was verified under Brazilian tests conducted on coarse-grained granite. Acoustic emission tests were respectively carried out after 2, 15 and 45 days time-delay since the preloading finished. Influence of time-delay on Kaiser effect were then discussed. The test results show that the closer the preloading stress to the ultimate strength, the less-pronounced the Kaiser effect is during reloading; and that the larger the time-delay, the faster the Kaiser effect decay. It is found from the Brazilain tests on granite specimens that Kaiser effect is still distinct after 15 days delay; and the effect disappears completely after time-delays of up to 45 days. The influence of friction contact between the specimen and apparatus on rock’s AE test results is also analyzed qualitatively.

Key words: acoustic emission, Kaiser effect, time-delay, Brazilian test

CLC Number: 

  • TU 459+.4
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