Micro-fracture evolution rule of sandstone specimens with a single hole under uniaxial compression

被引：4
|
作者：
Zhao G. [1 ]
Wang E. [1 ]
Wu H. [1 ]
Qiu J. [1 ]
Dai Y. [1 ]
机构：
[1] School of Resources and Safety Engineering, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Crack propagation; Digital image correlation method; Hole shape; Rock mechanics; Single hole sandstone;
D O I：
10.11817/j.issn.1672-7207.2019.08.017
中图分类号：
学科分类号：
摘要：
The INSTRON-1346 hydraulic servo control testing machine was used to carry out uniaxial compression test on 4 kinds of red sandstone with circular, trapezoid, horseshoe shape and square holes. The digital image correlation method was used to observe and analyze the deformation and fracture evolution of sandstone specimens, and the effect of hole shape on rock mechanical properties and fracture damage evolution law was studied. The results show that the compressive strength and elastic modulus of the rock are weakened to different degrees with different hole shapes, and the degradation of the trapezoidal pores is the most obvious. The deformation damage and evolution process of pore rock samples under uniaxial compression can be divided into 6 stages, i.e., pore gap compaction and tensile crack initiation, tensile crack stable propagation, secondary crack initiation, secondary crack rapid propagation, far field crack initiation and propagation, and macro shear formation and failure stages. The tensile cracks experience a process of "open-close-reopen" during the whole loading process. The initiation of secondary cracks is mostly due to the combined action of tension and shear failure. Thereafter, shear effect gradually plays a major role in the propagation of cracks. © 2019, Central South University Press. All right reserved.
引用
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页码：1891 / 1900
页数：9
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