Fracture Paths and Acoustic Emission Characteristics of Layered Brazilian Disc Specimens with Different Monolayer Thickness

2018 International Conference on Civil, Architecture and Disaster Prevention

土木建筑工程

Wang, Yizhao^1 ; Cui, Zhendong^2^3^4 ; Han, Weige^2^3^4 ; Zhang, Jianyong^2^3^4

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beiing Beijing

100083, China^1

Key Laboratory of Shale Gas and Engineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, Beijing

100029, China^2

Institution of Earth Science, Chinese Academy of Sciences, Beijing, Beijing

100029, China^3

College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, Beijing

100029, China^4

关键词: Acoustic emission characteristics;    Brazilian disc specimen;    Different thickness;    Initial cracks;    Interacting cracks;    Load-displacement curve;    Monolayer thickness;    Numerical simulation method;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/218/1/012005/pdf
DOI  :  10.1088/1755-1315/218/1/012005

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The Brazil disk test is carried out for thin layered rock with different thickness by numerical simulation method, with the load and AE data of samples analyzed.The following are some findings: (1) When the thickness of a single layer of layered rock increases, its tensile strength does not simply increase. Instead, they roughly show a U-shaped relationship. (2) Layered rock's load-displacement curve is multimodal. (3) Shear rupture occurs at the upper and lower ends of the disk, tensil and mixed rupture occurs more frequently in the middle of the disk. (4) There are three stages of of interacting cracks' coalescence: initial crack and the secondary fracture generate, then they interact and extend, lastly coalesce.