Cracking Characteristics and Damage Assessment of Filled Rocks Using Acoustic Emission Technology
Publication: International Journal of Geomechanics
Volume 23, Issue 4
Abstract
Natural flaws containing fillings strongly affect the mechanical properties and failure process of rocks in practical engineering. In this work, uniaxial compression tests are performed on filled and unfilled red sandstone specimens containing two parallel dentate flaws. Two monitoring technologies––acoustic emission (AE) and high-speed camera––are employed to record the cracking process of the flawed rocks. The effects of filling and ligament angles on the mechanical properties of the flawed rocks are analyzed. The relationship between AE parameters and stress–strain curves is established in order to evaluate the cracking process. The fracture behaviors between the filled and unfilled specimens are qualitatively compared. An intensity analysis method, based on the historic index and severity, is employed to assess the damage level of the flawed rocks. Simultaneously, a judgmental design criterion, including safety, early warning, and instability, is developed, which can be employed to evaluate the stability of rock structures.
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Acknowledgments
The present work was supported by the National Natural Science Foundation of China (Grant No. 41977256), the Zhejiang Natural Science Foundation (Grant No. LHZ21D020001), and the Scientific Research Fund Project of Shaoxing University (Grant No. 2021LG014), which are all gratefully acknowledged.
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Published In
International Journal of Geomechanics
Volume 23 • Issue 4 • April 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 24, 2022
Accepted: Oct 4, 2022
Published online: Jan 23, 2023
Published in print: Apr 1, 2023
Discussion open until: Jun 23, 2023
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