Study on the relationship between macroscopic failure and micro-crack evolution in interbedded sandstone

被引:5
作者
He, Hengyi [1 ]
Zheng, Lulin [1 ]
Zuo, Yujun [1 ]
Sun, Wenjibin [1 ]
Liu, Hao [2 ]
Pan, Chao [1 ]
Lin, Jianyun [2 ]
机构
[1] Guizhou Univ, Coll Min, Guiyang 550025, Guizhou, Peoples R China
[2] Guizhou Univ, Coll Resource & Environm Engn, Guiyang 550025, Guizhou, Peoples R China
基金
中国国家自然科学基金;
关键词
Sandstone; Anisotropy; Macroscopic property; Failure modes; Micro-crack evolution; INTERLAYER; BEHAVIOR; MODEL;
D O I
10.1007/s40948-022-00389-z
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
To study the relationship of macroscopic physical characteristics and microscopic cracks of interbedded sandstone. 2D particle flow code (PFC2D) is accustomed to exploring the strength, failure mode, and micro-crack evolution with distinct inclinations (beta) under uniaxial compression. The results show that the stress-strain curve of interbedded sandstone can be divided into the elastic, yielding, and crack propagation stages. The strength of the specimens is a U-shaped curve with increasing beta. When tensile failure (0 degrees, 15 degrees, 30 degrees, and 90 degrees) occurs, the interbedded effect coefficient (S-(beta)) is a minimum. The micro-cracks mainly accumulated at a uniform rate in the early stage with a uniform crack distribution, and pre-peak multi-peak phenomenon occurs. When composite failure (45 degrees) occurs, the S-(45 degrees) is maximum. In the later stage, the variation of micro-cracks is nonlinear growth periodically. Meanwhile, the inclination gradually increases, the post-peak multi-peak phenomenon occurs. Shear failure (60 degrees and 75 degrees) occurs, with a few micro-cracks, primarily in the interlayer in the early stage. The micro-cracks propagate fast and the inclination is directional, when macroscopic damage occurs in specimens, and post-peak multi-peak phenomenon occur. The results can be used as a guide for similar structures' instability warning and stability control.
引用
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页数:18
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