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| EXPERIMENTAL STUDY OF STRAIN RATE EFFECT AND ACOUSTIC EMISSION CHARACTERISTICS OF SALT ROCK UNDER UNIAXIAL COMPRESSION |
| JIANG Deyi，CHEN Jie，REN Song，WANG Weizhong，BAI Yueming |
| (State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China) |
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Abstract In order to understand the relationship between acoustic emission(AE) parameters and mechanical failure mechanism of salt rock，and to further reveal the damage evolution law under different loading strain rates，the damage evolution law and AE parameters of salt rock are studied under three kinds of loading strain rates of 2×10－3，2×10－4，2×10－5 s－1 by AE technique. The results show that：(1) The change laws of stress-strain curves of the three kinds of loading strain rates are similar. With the increase of loading rate，the elastic limit strength increases slightly，the peak strength and its corresponding strain value vary slightly，and the time of reaching the peak strength decreases linearly. (2) The slower the loading rate is，the more loosely the rock is crushed，which results in more cracks and more cumulative numbers of AE signal. (3) The faster the loading rate is，the larger the AE frequency is，and the brittle failure characteristic is more evident. The change range of AE signal frequency reflects the crack generation velocity and the damage evolution process of salt rock under different loading strain rates. The AE counts reflect rightly the stress-strain curve of salt rock before peak strength. The change of transmittance of salt rock can reflect the damage distribution regions and damage cumulative ranges to some extent under uniaxial compression. Based on the AE counts，the damage evolution equation is established，which can rightly reflect the evolution of salt rock under low loading strain rate.
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Received: 02 September 2011
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2012, Vol. 31 
