@article{f25a507b56734ea0a4e2bafc3749fff8,
title = "Relationships between P-wave velocity and mechanical properties of granite after exposure to different cyclic heating and water cooling treatments",
abstract = "The bedrocks of deep geothermal reservoirs are exposed to cyclic water cooling during the exploitation of deep geothermal energy. Therefore, it is important to understand the physico-mechanical parameters of geothermal reservoir rocks. This paper reports on the P-wave velocity (Vp), uniaxial compressive strength (UCS) and elastic modulus (E) of granite specimens after exposure to different cyclic heating and water cooling treatments based on laboratory tests, and the relationships between Vp, UCS and E established through regression analysis. The physico-mechanical parameters of granite specimens all decrease remarkably in the first few thermal cycles, and their rates of decrease gradually diminish with thermal cycles, which is beneficial for the long-term exploitation of deep geothermal resources. Both UCS and E show a logarithmic correlation with Vp of granite under different high temperatures. There is a transformation from a linear relation (1 and 5 cycles) to an exponential relation (from 10 to 30 cycles) between Vp, UCS and E with thermal cycles. Such a correlation can provide a good estimation and avoid the costly, time-consuming and tedious mechanical tests. SEM observation reveals the change mechanism of the deterioration of physico-mechanical parameters, which can guide the well borehole stability during the deep geothermal energy exploitation.",
keywords = "Granite, Mechanical properties, Microstructure, P-wave velocity, Thermal cycling, Water cooling",
author = "Zhennan Zhu and Ranjith, {Pathegama Gamage} and Hong Tian and Guosheng Jiang and Bin Dou and Gang Mei",
note = "Funding Information: This work was jointly supported by the National Natural Science Foundation of China (No. 41602374 and No. 41674180 ), the Fundamental Research Funds for the Central Universities-Cradle Plan for 2017 (Grant No. CUGL170207 ) and the National Key Research and Development Program of China (No. 2019YFB1504201 , No. 2019YFB1504203 and No. 2019YFB1504204 ). The project was also supported by the Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan). We are also grateful to the 3Gdeep group (Department of Civil Engineering, Monash University, Australia) for hosting me and their help in providing valuable suggestions on the manuscript revision. Funding Information: This work was jointly supported by the National Natural Science Foundation of China (No. 41602374 and No. 41674180), the Fundamental Research Funds for the Central Universities-Cradle Plan for 2017 (Grant No. CUGL170207) and the National Key Research and Development Program of China (No. 2019YFB1504201, No. 2019YFB1504203 and No. 2019YFB1504204). The project was also supported by the Fundamental Research Funds for National Universities, China University of Geosciences (Wuhan). We are also grateful to the 3Gdeep group (Department of Civil Engineering, Monash University, Australia) for hosting me and their help in providing valuable suggestions on the manuscript revision. Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",
year = "2021",
month = may,
doi = "10.1016/j.renene.2020.12.048",
language = "English",
volume = "168",
pages = "375--392",
journal = "Renewable Energy",
issn = "0960-1481",
publisher = "Elsevier",
}