Acoustic Emission Characteristics and Damage Evolution of Rock Salt under Uniaxial Compression

ZHOU Zhi-wei; LIU Jian-feng; ZOU Hang; ZHUO Yue; XU Yang-meng-di

doi:10.11988/ckyyb.20150168

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Journal of Changjiang River Scientific Research Institute ›› 2016, Vol. 33 ›› Issue (5) : 63-68. DOI: 10.11988/ckyyb.20150168

ROCK-SOIL ENGINEERING

Acoustic Emission Characteristics and Damage Evolution of Rock Salt under Uniaxial Compression

ZHOU Zhi-wei , LIU Jian-feng, ZOU Hang, ZHUO Yue, XU Yang-meng-di

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Abstract

In order to explore the relation between acoustic emission phenomenon and internal damage in the failure process of compression deformation of rock salt, we conducted uniaxial compression test on salt rock from Anning, Yunnan province using MTS815 rock mechanics test system of Sichuan University. The damage evolution model of rock salt was established with acoustic emission parameters based on damage theory and the damage variable D was modified by coefficient of correction. The research results show that the maximum values of ring count rate and energy rate appeared near the elastic limit and the phenomenon of high frequency and low amplitude appeared later; the damage value based on AE increased rapidly in the early stage of compressive deformation, and the damage value based on AE accumulated ring counts is smaller than that based on cumulative energy; the revised damage model curve is in agreement with the whole process of test curve and could reflect the damage evolution process of rock salt well.Simulation using ring count can reflect the damage evolution characteristics of rock salt better than using energy.

Key words

rock salt / acoustic emission / damage model / damage variable / coefficient of correction

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ZHOU Zhi-wei , LIU Jian-feng, ZOU Hang, ZHUO Yue, XU Yang-meng-di. Acoustic Emission Characteristics and Damage Evolution of Rock Salt under Uniaxial Compression[J]. Journal of Changjiang River Scientific Research Institute. 2016, 33(5): 63-68 https://doi.org/10.11988/ckyyb.20150168

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