Experimental and numerical investigation on the tensile behaviour of rocks using the Brazilian disc method

作     者：Chen, Yulong Zhang, Xuwen Yuan, Honghui Zhang, Junwen 

作者机构：China Coal Res Inst Beijing 100013 Peoples R China China Univ Min & Technol Beijing Beijing 100083 Peoples R China 

出 版 物：《JOURNAL OF APPLIED GEOPHYSICS》 (J. Appl. Geophys.)

年 卷 期：2025年第233卷

核心收录：

学科分类：0819[工学-矿业工程] 07[理学] 0708[理学-地球物理学] 

基　　金：National Natural Science Foundation of China 

主　　题：EMR AE Brazilian disc Cracking Fractal dimension B-value 

摘      要：Characterizing engineering properties of rock especially associated with tension is crucial for stability assessment of rock structures. This study integrates physical and numerical experiments to investigate the electromagnetic radiation (EMR) and acoustic emission (AE) responses of sandstone under Brazilian disc testing. During the Brazilian splitting process, the EMR and AE responses reflect well the cracking evolution of the disc sandstone specimen. The cracking evolution process and failure mechanism are vividly illustrated. When approaching the peak stress, massive EMR and AE activities occur abruptly. Importantly, the fractal dimension and b-value of EMR and AE switch from increase to decrease once the failure initiates. Such significant decrease in the fractal dimension and b-value of EMR and AE upon failure initiation could be applied to identify the rock failure initiation.