Quantitative Visualization Monitoring of Cracks at Shotcrete-Rock Interface Based on Acoustic Emission

Author:

Guo Yuzhu1,Chen Xudong2ORCID,Wu Jin2,Ji Tao3,Ning Yingjie4ORCID

Affiliation:

1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China

2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

3. Department of Civil Engineering, Fuzhou University, Fuzhou 350116, China

4. Zhejiang Communications Construction Group Co., Ltd., Hangzhou 310051, China

Abstract

To investigate the possibility of quantitative monitoring of the fracture process zone (FPZ) at the shotcrete-rock interface, the acoustic emission (AE) and digital image correlation (DIC) are used to monitor the three-point bending test of shotcrete-rock specimens. Firstly, the AE intensity signal characteristics during damage to the shotcrete-rock interface are analyzed. Then, the spatial b-value of AE is used to visually characterize the shotcrete-rock interface damage, and the interface damage characteristics of two specimens, shotcrete-granite and shotcrete-sandstone, are analyzed using this analysis method. The analysis reveals that not only the AE spatial b-value can determine the location of microdamage within the interface but it can also characterize the degree of damage. Finally, a new parameter, Tb-value, is constructed based on the AE spatial b-value to quantitatively characterize the FPZ, and the newly established characterization method is validated with the FPZ monitored by DIC. The results show that the Tb-value not only locates and visually characterizes the location of the FPZ within the specimen but also enables the quantitative determination of the FPZ. This provides a new idea for localizing and quantitatively monitoring cracks and FPZs inside structures using AE techniques.

Funder

National Basic Research Program of China

Publisher

Hindawi Limited

Subject

Mechanics of Materials,Building and Construction,Civil and Structural Engineering

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