Elastic Modulus and Dynamic Evolution of Fracture in Double-Fractured Sandstone Under Cyclic Loading

被引：0
|
作者：
Wang S.-H. [1 ]
Zhuang X.-P. [1 ]
Wang F. [1 ]
Zhao Q.-B. [1 ]
机构：
[1] School of Resources & Civil Engineering, Northeastern University, Shenyang
来源：
Dongbei Daxue Xuebao/Journal of Northeastern University | 2024年 / 45卷 / 03期
关键词：
cyclic loading; damage variables; double-fractured sandstone; elastic modulus; failure mode; PFC[!sup]2D[!/sup; stress-strain curve;
D O I：
10.12068/j.issn.1005-3026.2024.03.008
中图分类号：
学科分类号：
摘要：
In order to study the changes in elastic modulus and the dynamic evolution of cracks in sandstones with different inclination angles of rock bridges under cyclic loading,uniaxial cyclic loading and unloading tests,along with PFC2D simulations were carried out on sandstone specimens with rock bridge inclination angles of 15°,45°,75°,90° and 105° when the fissure inclination angle was fixed at 45°. The results show that a significant strengthening of the elastic modulus of sandstone with different fissures due to cyclic loading. There is a correlation between the stress-strain curve and the instantaneous microcrack evolution curve of specimens obtained from discrete element simulation under cyclic loading. The rock bridge inclination angle has an influence on the damage mode of sandstone,and the dynamic crack evolution in the PFC2D simulation can reasonably reflect the initiation location and growth direction of cracks in the rock. The damage defined based on the number of microcracks,corresponds well to the damage pattern,with the maximum original damage at a rock bridge inclination angle of 45°. © 2024 Northeast University. All rights reserved.
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页码：361 / 371
页数：10
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