Damage Mechanism Analysis of Rock-Shotcrete under Uniaxial Compression

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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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