Fatigue properties and damage constitutive model of salt rock based on CT scanning

IF 11.7 1区工程技术 Q1 MINING & MINERAL PROCESSING International Journal of Mining Science and Technology Pub Date : 2024-02-01 DOI:10.1016/j.ijmst.2024.01.002

Junbao Wang , Xiao Liu , Qiang Zhang , Xinrong Liu , Zhanping Song , Shijin Feng

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Abstract

To investigate the macroscopic fatigue properties and the mesoscopic pore evolution characteristics of salt rock under cyclic loading, fatigue tests under different upper-limit stresses were carried out on salt rock, and the mesoscopic pore structures of salt rock before and after fatigue tests and under different cycle numbers were measured using CT scanning instrument. Based on the test results, the effects of the cycle number and the upper-limit stress on the evolution of cracks, pore morphology, pore number, pore volume, pore size, plane porosity, and volume porosity of salt rock were analyzed. The failure path of salt rock specimens under cyclic loading was analyzed using the distribution law of plane porosity. The damage variable of salt rock under cyclic loading was defined on basis of the variation of volume porosity with cycle number. In order to describe the fatigue deformation behavior of salt rock under cyclic loading, the nonlinear Burgers damage constitutive model was further established. The results show that the model established can better reflect the whole development process of fatigue deformation of salt rock under cyclic loading.

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基于 CT 扫描的盐岩疲劳特性和损伤构成模型

为研究循环加载下盐岩的宏观疲劳特性和中观孔隙演化特征，对盐岩进行了不同上限应力下的疲劳试验，并利用CT扫描仪测量了疲劳试验前后和不同循环次数下盐岩的中观孔隙结构。根据试验结果，分析了循环次数和上限应力对盐岩裂缝演变、孔隙形态、孔隙数量、孔隙体积、孔隙大小、平面孔隙率和体积孔隙率的影响。利用平面孔隙率分布规律分析了盐岩试样在循环荷载作用下的破坏路径。根据体积孔隙率随循环次数的变化，定义了循环加载下盐岩的破坏变量。为了描述循环加载下盐岩的疲劳变形行为，进一步建立了非线性布尔格斯损伤构成模型。结果表明，所建立的模型能较好地反映循环加载下盐岩疲劳变形的整个发展过程。

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.