Technical gazette, Vol. 27 No. 3, 2020.
Original scientific paper
https://doi.org/10.17559/TV-20180705053718
Hysteresis Characteristics of Brittle Rock Deformation under Constant Load Cyclic Loading and Unloading
Peijie Lou
; School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001Huainan, China
Chengjie Li
; School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001Huainan, China
Shuling Liang
; School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001Huainan, China
Mingming Feng
; School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001Huainan, China
Bin Pan
; School of Civil and Architectural Engineering, Anhui University of Science and Technology, 232001Huainan, China
Abstract
This paper mainly explores the deformation characteristics of limestone specimens under constant load cyclic loading. For limestone specimens under uniaxial compression, the stress-strain curve can be divided into three stages: compaction stage, elastic stage and sudden failure stage. Under cyclic loading, the hysteresis loop on the stress-strain curve is long and thin, taking the shape of "toothpicks". The axial strain and radial strain both change with the stress amplitude and cycle number, but in different variation patterns. There is a stress amplitude "threshold" for radial deformation, indicating that the radial deformation is more sensitive to stress amplitude than the axial deformation. It is calculated that the incremental deformation between peaks includes both plastic deformation and the deformation recoverable after unloading, and the recoverable deformation is positively correlated with the load amplitude of the cyclic loading.
Keywords
cyclic loading and unloading; deformation threshold; hysteresis deformation; recoverable deformation
Hrčak ID:
239101
URI
Publication date:
14.6.2020.
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