Title:
Damage Mechanism Analysis of Rock-Shotcrete under Uniaxial Compression
Author(s):
Dandan Shi, Xudong Chen, and Yingjie Ning
Publication:
Materials Journal
Volume:
119
Issue:
6
Appears on pages(s):
247-261
Keywords:
acoustic emission (AE); damage; digital image correlation (DIC); failure analysis; rock-shotcrete composite
DOI:
10.14359/51737193
Date:
11/1/2022
Abstract:
In this study, uniaxial unconfined compression tests were carried out on four different composites with two types of rocks and shotcretes. The failure process was monitored by digital image correlation (DIC) and acoustic emission (AE) technologies to reveal the damage mechanism of the composites. The experimental results showed that with the load increase, the shotcrete part of the composites first entered the plastic stage, and then the main crack formed and penetrated across the interface to the rock side. The
peak strength of the composite material was mainly determined by the shotcrete, and the fiber could effectively improve the ductility of the composites. Besides, the multiple analysis method of AE parameters showed that polypropylene (PP) fiber had a greater influence on the damage mechanism of the composite than the rock types. Finally, based on the rate process theory, a damage model was proposed, and the evaluation criteria of different rock shotcrete composites was given.
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