Effects of foliation on deformation and failure mechanism of silty slates. (May 2021)

• Record Type: Journal Article
• Authors: Li, Zhigang; Xu, Guangli; Dai, Yunyun; Zhao, Xin; Fu, Yongpeng
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 141(2021)
• Publication Date: 2021-05
• Subjects: Rock mechanics -- Silty slate -- Uniaxial compress test -- Acoustic emission -- SEM; Rock mechanics -- Periodicals; Soil mechanics -- Periodicals; Mining engineering -- Periodicals; Roches, Mécanique des -- Périodiques; Sols, Mécanique des -- Périodiques; Technique minière -- Périodiques; 624.151305
• DOI: 10.1016/j.ijrmms.2021.104703
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: The objective of this study was to investigate the deformation and failure mechanism of silty slates loaded with an angle 0 and 90° between foliation and direction of uniaxial force. For this purpose, mineral composition and microstructure test, uniaxial compression test, acoustic emission (AE) monitoring and scanning electron microscope (SEM) were carried out on Silurian silty slates. Based on the results of tests to analyze the deformation and failure mechanism as well as the macroscopic failure modes, microscopic rupture surface characteristics and acoustic emission characteristics of silty slates under different test conditions. Tests results showed that the silty slates are mainly composed of clay minerals (chlorite and illite) and brittle minerals (quartz and feldspar) and in a layered structure. Under the two angles, silty slates specimens exhibited large differences in the deformation and damage process, macroscopic failure modes, microscopic rupture surface characteristics, deformation and failure mechanism. Besides, there are large differences in the relative parameters of AE event. These results reveal that there is a certain relationship between mechanisms of microscopic fractures and macro failure of silty slates.