Microscopic damage evolution of anisotropic rocks under indirect tensile conditions: Insights from acoustic emission and digital image correlation techniques  

作　　者：Chaoqun Chu Shunchuan Wu Chaojun Zhang Yongle Zhang 

机构地区：[1]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Department of Civil&Mineral Engineering,University of Toronto,Toronto ON M5S 1A4,Canada [3]Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunmiing 650093,China [4]China Railway Sixth Group Limited Company,Beijing 100036,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第9期1680-1691,共12页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.51934003);the Major Science and Technology Special Project of Yunnan Province,China(Nos.202102AF080001 and 202102AG050024)。

摘　　要：The anisotropy induced by rock bedding structures is usually manifested in the mechanical behaviors and failure modes of rocks.Brazilian tests are conducted for seven groups of shale specimens featuring different bedding angles. Acoustic emission (AE) and digital image correlation (DIC) technologies are used to monitor the in-situ failure of the specimens. Furthermore, the crack morphology of damaged samples is observed through scanning electron microscopy (SEM). Results reveal the structural dependence on the tensile mechanical behavior of shales. The shale disk exhibits compression in the early stage of the experiment with varying locations and durations. The location of the compression area moves downward and gradually disappears when the bedding angle increases. The macroscopic failure is well characterized by AE event location results, and the dominant frequency distribution is related to the bedding angle. The b-value is found to be stress-dependent.The crack turning angle between layers and the number of cracks crossing the bedding both increase with the bedding angle, indicating competition between crack propagations. SEM results revealed that the failure modes of the samples can be classified into three types:tensile failure along beddings with shear failure of the matrix, ladder shear failure along beddings with tensile failure of the matrix, and shear failure along multiple beddings with tensile failure of the matrix.

关 键 词：anisotropic rock failure mechanism acoustic emission digital image correlation Brazilian test 

分 类 号：TD313[矿业工程—矿井建设] TP391[自动化与计算机技术—计算机应用技术]