Anisotropic crack evolution and fractal failure mechanism of Lushan shale under compression: insights from acoustic emission.

ABSTRACT: The Lushan shale, located in the Upper Sinian Formation of China, is a promising zone for commercial shale gas development. Understanding the crack evolution and fractal failure mechanisms of anisotropic Lushan shale under compression is critical for ensuring safe drilling and optimizing reservoir reconstruction. In this study, uniaxial compression tests were conducted on Lushan shale samples with varying bedding angles (θ) ranging from 0° to 90°, using acoustic emission (AE) techniques to monitor crack propagation and failure processes. The results reveal that both uniaxial compressive strength (UCS) and cumulative AE counts initially decrease and then increase with increasing bedding angle, reaching a minimum at θ = 60°. During the initial loading phase, microcracking activity predominat

SUBMITTER: Huang H 

PROVIDER: S-EPMC12022307 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature