AE Characteristic and Mechanical Behaviors of Red Sandstone with Two Prefabricated Close-Collinear-Equal Length Cracks under Compression

Ansen Gao; Chengzhi Qi; Renliang Shan; Chunlai Wang; Gevorg G Kocharyan

doi:10.1021/acsomega.2c06951

AE Characteristic and Mechanical Behaviors of Red Sandstone with Two Prefabricated Close-Collinear-Equal Length Cracks under Compression

ACS Omega. 2023 Jan 6;8(2):2476-2484. doi: 10.1021/acsomega.2c06951. eCollection 2023 Jan 17.

Authors

Ansen Gao¹, Chengzhi Qi^{1

2

3}, Renliang Shan¹, Chunlai Wang⁴, Gevorg G Kocharyan⁵

Affiliations

¹ School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing100083, People's Republic of China.
² School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing100044, People's Republic of China.
³ Beijing Advanced Innovation Centre for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing100044, People's Republic of China.
⁴ School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing100083, People's Republic of China.
⁵ Sadovsky Institute of Geosphere Dynamics (IDG RAS), Moscow119334, Russia.

Abstract

Preexisting cracks are of great significance for the stability of rocks, they can influence the growth and propagation pattern of cracks. For revealing the failure characteristics of rocks with prefabricated cracks, the mechanical behaviors of red sandstone with two close-collinear-equal length cracks were studied by acoustic emission (AE) monitoring experiment. The results indicated that the stress of red sandstone specimens showed an obvious stepwise growth phenomenon, and AE ring counts can better characterize the growth of microcracks of rocks. Moreover, AE events were mainly distributed near the prefabricated cracks of rocks. Then, a novel modified Kachanov method for analyzing collinear-close cracks was proposed. The influences of crack length and crack spacing on the interaction force of cracks were discussed. Then, it can be found that this modified method had a good applicability for two close-collinear-equal length cracks of rocks under compression.