Experimental Investigation on Failure Mechanism of Hot Dry Rock under Microwave Irradiation
Publication: International Journal of Geomechanics
Volume 23, Issue 4
Abstract
Hot dry rock (HDR) geothermal energy is clean energy that can meet people’s demand for low carbon. The traditional hydraulic fracturing method is challenging to break HDR dominated by granite, mainly because of HDR’s high temperature and hard characteristics. Microwave irradiation is considered a proven approach to breaking granite. This study investigates the failure mechanism of HDR at 500°C–800°C under microwave irradiation. The experiments cover preheating, uniaxial compression, granulometric analysis, binocular vision monitoring (BVM) technique, and X-ray powder diffraction. The result shows that the uniaxial compression strength of granite decreases the most at 500°C–600°C, which is 62.77% on average. The failure form is from the brittle failure (untreated) to ductile failure (800 °C) with the rise of the microwave irradiation temperature. The microwave makes a particle size in the range of 0.6–2.36 mm the most apparent particle size of granite after uniaxial compression. The BVM technique reconstructs the surface deformation with a 0.7% error. Microwaves cause heat accumulation near the rock near the magnetron, resulting in the formation of crack networks and a molten cavity. The possibility of microwave-assisted fracturing of HDR is discussed at the end of the article.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (52078442 and 52178357), the Sichuan Science and Technology Program (2020JDRC0091, 2021YFSY0006, and 2021YFSY0307), and the Southwest Petroleum University Graduate Research and Innovation Fund Project (2020cxyb011).
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Published In
International Journal of Geomechanics
Volume 23 • Issue 4 • April 2023
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© 2023 American Society of Civil Engineers.
History
Received: Apr 28, 2022
Accepted: Oct 3, 2022
Published online: Jan 27, 2023
Published in print: Apr 1, 2023
Discussion open until: Jun 27, 2023
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