An improved rock damage model from a cyclic temperature – triaxial loading experiment for compressed air energy storage caverns

IF 6.9 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Engineering Geology Pub Date : 2024-12-11 DOI:10.1016/j.enggeo.2024.107857
Zhongyu Yu, Shiwei Shen, Miao Li, Min Zhang, Lupeng Tian, Guowen Hua
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Abstract

While studies on rock damage have mostly examined cyclic mechanical loading, or addressed thermal and mechanical loadings separately, compressed air energy storage (CAES) projects require the coupling of both effects. Granite was used to demonstrate a systematic experimental procedure in which cyclic temperature effects was incorporated into fatigue damage study of rocks subject to cyclic mechanical loading. Granite specimens were pre-treated with cyclic temperatures up to 200 °C, 400 °C, and 600 °C, with the P-wave velocity tested after each cycle. Subsequently, the treated specimens went through triaxial cyclic loading. The upper limit of the triaxial cyclic loading was 200 MPa, and the confining pressures were 5 MPa, 10 MPa, and 15 MPa. Granite exhibited hardened and weakened behaviour. The specimens were weakened if the deviatoric stress exceeded the fatigue threshold, which was determined by the cyclic temperature and the confining pressure in this study. A damage model was derived to quantify the degree of hardening and weakening. The model improved the existing damage models by incorporating the cyclic temperature effect. This study lays a foundation for safe operation of CAES projects.
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来源期刊
Engineering Geology
Engineering Geology 地学-地球科学综合
CiteScore
13.70
自引率
12.20%
发文量
327
审稿时长
5.6 months
期刊介绍: Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.
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