冻融循环对花岗岩声发射特性影响的试验研究

doi:10.13722/j.cnki.jrme.2018.0953

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Abstract In alpine regions，freezing and thawing have an important influence on the acoustic emission(AE) characteristics and the frost resistance index of rock mass. Freezing-thawing tests and the uniaxial compression AE tests of granite specimens from cold areas were carried out. Results show that，as the freezing-thawing cycles increase，the frost resistance coefficient of granite specimens decreases and the mass loss rate gradually increases. With increasing the number of the freeze-thaw cycle，the end effect of the specimen becomes more obvious and AE counts at failure increase significantly. AE ring-down counts can be divided into three stages such as the contact period，the quiet period and the destructive period. With increasing freezing-thawing cycles，the duration of the contact period extends and AE ring-down counts increase obviously，the density of the ring-down counts at the calm period increases with many abrupt points，and AE ring-down counts are larger with a longer duration in the destructive period. As the number of the freezing-thawing cycle increases，the peak frequency points of AE signal are concentrated from the distracted state to a dominant peak frequency. When the sample is near to destruction，the dominant peak frequency of the AE signal gradually concentrates to the mid-high frequency band and the low-frequency of the AE signal reduces continuously. The probability density of the AE energy under different freezing-thawing conditions can meet the power law distribution. The critical index reflecting the scale invariance first decreases and subsequently increases slowly with increasing the number of the freezing-thawing cycles. The experimental results are of important significance for the application of AE technology in the cold region to identify and predict the stability of rock mass and to study the freezing and thawing damage mechanism of rock.

Key words： rock mechanics freezing-thawing cycles frost resistance peak frequency point of AE signal AE energy critical index

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	Articles by authors
	SU Zhandong1
	SUN Jinzhong1
	2
	XIA Jing1
	WU Chenglong1

Cite this article:

SU Zhandong1,SUN Jinzhong1,2, et al. Experimental research of the effect of freezing-thawing cycles on acoustic emission characteristics of granite[J]. , 2019, 38(5): 865-874.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0953 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I5/865

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