Particle flow analysis of parallel double crack evolution under uniaxial compression

被引：14
|
作者：
Li Y. [1 ,2 ]
Cai W. [1 ,2 ]
Zhu W. [1 ]
Dong Z. [1 ,2 ]
Zhang Q. [1 ,3 ]
机构：
[1] Geotechnical & Structural Engineering Research Center, Shandong University, Jinan
[2] School of Qilu Transportation, Shandong University, Jinan
[3] School of Civil Engineering, Shandong University, Jinan
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Crack propagation; Discrete element; Displacement field; Stress field;
D O I：
10.11817/j.issn.1672-7207.2019.12.013
中图分类号：
学科分类号：
摘要：
The mechanism of crack initiation, propagation, and overlap in cement mortar specimens with parallel double pre-existing flaws under different fracture dip angles and uniaxial compression was investigated based on the discrete element theory. Stress field and displacement field were employed to analyze the evolution of crack propagation. The results show that when the crack inclination angle reaches 30°, the wing crack remains unchanged for a long time until the secondary crack occurs after propagating under the maximum stress drop along the vertical crack plane direction, and the wing crack on the outer side of the crack continues to expand along the maximum loading direction under the action of maximum tensile stress; At the early stage of initiation, the occurrence of secondary cracks weakens the compressive stress concentration at the crack tip and inhibits the crack propagation inside the flaw. Before the secondary crack initiation, the tensile stress is relatively large in a region between the fractures. Therefore, the secondary cracks are generally instantaneously formed, and the width of the crack formed is much larger than the width of the wing crack. The maximum tensile stress concentrated between the cracks contributes to the appearance of secondary crack with instant and much wider than that of the wing crack. Wing cracks are mainly initiated by relative or direct stretching between particles. Secondary crack SC-1 preferentially appears between crack tips R1 and R2 as tensile cracks and transforms into tensile-shear composite crack with the increasing axial stress. © 2019, Central South University Press. All right reserved.
引用
收藏
页码：3035 / 3045
页数：10
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