Crack propagation law of brittle rock mass under cyclic loading and unloading

被引：1
|
作者：
Zhou X. [1 ]
Li J. [1 ]
机构：
[1] School of Resources and Safety Engineering, Central South University, Changsha
来源：
Li, Jiangteng (ljtcsu@163.com) | 1600年 / Central South University of Technology卷 / 51期
基金：
中国国家自然科学基金;
关键词：
Crack propagation; Discrete element; Marble; Triaxial cyclic loading;
D O I：
10.11817/j.issn.1672-7207.2020.03.017
中图分类号：
学科分类号：
摘要：
The crack propagation and mechanical response of prefabricated double crack marble were analyzed using discrete element particle flow software. The crack propagation and failure characteristics of prefabricated double-fractured rock specimens with different inclination angles under triaxial cyclic loading were simulated on the base of obtaining a set of perfect rock micro-parameters. The results show that the crack propagation is not only affected by the inclination angles, but also changes with the change of confining pressure. The prefabricated horizontal crack has certain protective effect on the prefabricated inclined crack under the triaxial cyclic load. With the increase of the inclination angle, the protection effect is more obvious. The number of cracks in prefabricated double-fracture marble increases with the increase of confining pressure, and the micro-crack number curve shows the same growth law during the whole process of cyclic loading. The angle of the inclined crack α also has influence on the peak strength. When α increases to 60°, the peak strength under different confining pressures increases significantly, and the growth rate of the peak strength decreases after α>60°, and the confining pressure inhibits the increase trend of this peak strength. © 2020, Central South University Press. All right reserved.
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页码：724 / 731
页数：7
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