Mechanical behavior and fracture analysis of sandstone containing cross-fissures under uniaxial compression by digital image correlation
Yuanyuan Wan
School of Architecture and Civil Engineering, Suqian University
Xiangru Liu
School of Architecture and Civil Engineering, Suqian University
Xuelei Zhang
School of Architecture and Civil Engineering, Suqian University
DOI: https://doi.org/10.59429/pest.v7i2.10382
Keywords: Fissured rock; Mechanical behavior; Cracking process; Acoustic emission; Digital image correlation
Abstract
To investigate the mechanical behavior and cracking process of fissured rock, uniaxial compression tests were conducted on sandstone specimens containing cross-fissures. During the experiments, crack initiation, propagation and coalescence were monitored by using acoustic emission (AE) method and digital image correlation (DIC) technique. Experimental results indicate that the ligament angle is a significant factor influencing the mechanical behaviors of pre-cracked specimen. With an increase of ligament angle, the peak strength and peak strain first increase, and then decrease, finally increase again, whereas the elastic modulus first decreases and then increases. Based on the analysis of the ultimate failure patterns, rock bridge coalescence mode can be classified into five categories: no coalescence, shear coalescence, tensile coalescence, three-shear coalescence and double-tensile coalescence. AE counts reach the maximum value at or after the peak strength. Additionally, the evolution of the strain localization zone can be used for identification of cracking processes, namely crack initiation, propagation and coalescence.
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