Experimental study on effect of loading rate and initial damage on energy evolution of sandstone

被引：0
|
作者：
Li S. [1 ,2 ]
Chen G. [1 ,2 ]
Shuang H. [1 ,2 ]
Lin H. [1 ,2 ]
Zhao P. [1 ,2 ]
机构：
[1] College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi
[2] Key Laboratory of Western Mine Exploitation and Hazard Prevention, Ministry of Education, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 02期
关键词：
Energy evolution; Initial damage; Loading rate; Uniaxial compression;
D O I：
10.13545/j.cnki.jmse.2019.02.021
中图分类号：
学科分类号：
摘要：
To study the effect of loading rate and initial damage on the energy evolution characteristics of sandstone, the test of some rock samples initial damage by preloading, and the uniaxial compression tests of the original rock samples and the initial damaged rock samples with different loading rates are carried out to analyze the energy evolution characteristics of sandstone specimen under the influence of loading rate and initial damage. Experimental results have shown that the initial damage caused by the pre-pressure truly reflects the random distribution of micro-crack damage in rock; the acoustic emission technique can accurately characterize the damage and its position. Different loading rates have little effect on the evolution of the elastic properties, but the maximum elastic energy accumulated before the rock failure increases. Additionally, compared with original rock samples, the initial damage slows down the increase of elastic energy and reduces the maximum elastic energy accumulated before failure. Finally, the rock damage evolution equation is established from the perspective of energy dissipation, and the calculation results show that the damage evolution equation based on energy dissipation analysis can well describe the rock damage evolution process. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：373 / 380
页数：7
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