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Bulletin of Engineering Geology and the Environment

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06-11-2017 | Original Paper

Acoustic emission characteristics and energy mechanism in karst limestone failure under uniaxial and triaxial compression

Authors: Qingsong Wang, Jianxun Chen, Jiaqi Guo, Yanbin Luo, Hongyu Wang, Qin Liu

Published in: Bulletin of Engineering Geology and the Environment | Issue 3/2019

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Abstract

Acoustic emission (AE) tests were performed on saturated karst limestone under uniaxial and triaxial compression. Mechanical properties, AE characteristics, and the energy mechanism of rock failure were analyzed. The peak AE activity under uniaxial compression occurred near the peak stress of the rock. Under triaxial compression, the AE activities of the rock samples first decreased then increased with increases in confining pressure. AE activity exhibited a certain lag, and the peak AE appeared when the stress had decreased significantly. Stratification of the average signal level occurred at low confining pressures. The critical confining pressure was between 15 and 20 MPa, and at this pressure a dramatic change occurred in the AE characteristics of the limestone. Total strain energy, dissipated energy, and elastic strain energy at peak stress showed good exponential relationships with confining pressure and peak rock strength.

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Title: Acoustic emission characteristics and energy mechanism in karst limestone failure under uniaxial and triaxial compression
Authors: Qingsong Wang
Jianxun Chen
Jiaqi Guo
Yanbin Luo
Hongyu Wang
Qin Liu
Publication date: 06-11-2017
Publisher: Springer Berlin Heidelberg
Published in: Bulletin of Engineering Geology and the Environment / Issue 3/2019
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-017-1189-y

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