›› 2009, Vol. 30 ›› Issue (S1): 58-62.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analysis of acoustic property of sandstone fatigue damage under cyclic loading

FAN Xiu-feng, WU Zhen-xiang, JIAN Wen-bin   

  1. College of Enviroment and Resources, Fuzhou University, Fuzhou 350002, China
  • Received:2009-03-20 Online:2009-08-10 Published:2011-03-16

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Abstract:

By means of uniaxial closed-loop system and real-time observation system, with the measurement of ultrasonic wave velocity and strain at the same time; the experiments on sandstones fatigue damage are performed under constant amplitude cyclic loading. The acoustic parameters during sandstone fatigue damage including ultrasonic wave velocity, amplitude and waveform are real-time measured and analyzed in detail. Results show that the ultrasonic wave velocity varies temperamentally and reduces following inversed S-shaped line, which can be divided into three phases during fatigue damage of sandstones. The amplitude of ultrasonic wave fluctuates with damage. The waveform alters from regular fusiform to malformation; and its correlation coefficient is descending as a whole with the damage development. The micro destructive mechanism of the sandstones under cyclic loading is analyzed according to the variance of acoustic parameters. The testing results offer a choice of choosing acoustic parameters identifying rock fatigue damage process.

Key words: cyclic loading, sandstone, fatigue damage, acoustic parameters

CLC Number: 

  • TU 459
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