Experimental study on the evolution of non-uniform deformation of rock under constant amplitude cyclic loading

被引：0
|
作者：
Yang X. [1 ,2 ]
Han X. [1 ,2 ]
Liu E. [1 ,2 ]
Zhou J. [1 ,2 ]
Zhang Z. [1 ,2 ]
Wang X. [1 ,2 ]
机构：
[1] School of Resource and Safety Engineering, China University of Mining & Technology (Beijing), Beijing
[2] Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining & Technology (Beijing), Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 02期
关键词：
Constant amplitude cyclic loading; Deformation accumulation; Digital speckle correlation method; Hysteresis; Non-uniform deformation;
D O I：
10.13545/j.cnki.jmse.2019.02.023
中图分类号：
学科分类号：
摘要：
In order to study the deformation and evolution laws of rock under cyclic loading conditions, the constant amplitude cyclic loading tests and multistage constant amplitude cyclic loading tests of red sandstone specimens have been carried out. The deformation images of specimens during the tests have been collected with CCD cameras, and based on the digital speckle correlation methods, the evolution laws of non-uniform deformation of specimens in the process of constant amplitude cyclic loading have been analyzed. The research results have shown that during the cyclic loading process, with the increase of cyclic numbers, the non-uniform deformation field of specimen gradually evolves and the deformation localization phenomenon is more and more obvious. The characteristics of time hysteresis and deformation accumulation in non-uniform deformation exist during the cyclic loading process, and the increase of peak stress in the process of multistage constant amplitude cyclic loading will make the hysteresis and accumulation characteristics of non-uniform deformation more obvious. Before the failure of rock specimen, the values of non-uniform deformation index at the peak point of loading and the bottom point of unloading are getting closer. The study on the evolution laws of non-uniform deformation of rock under cyclic loading can provide new precursory information for rock failure. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：388 / 395
页数：7
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