Key Takeaways & Executive Findings
- •• Cyclic heating induces significant deterioration of granite's physical and mechanical properties, promoting stress propagation perpendicular to the fracture path. • Thermal cycling increases tensile damage on fracture surfaces and accelerates the overall rock failure process. • Cyclic heating generates more fine debris, raising the fractal dimension and enhancing the rock rupture degree. • Debris fractal analysis enables real-time monitoring of fracture propagation in enhanced geothermal systems (EGS).
Abstract
1. Introduction
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JIANG Tian-qi, CHEN Bing, ZHANG Qing-song, SHEN Bao-tang, BAI Ji-wen, LIU Ren-tai, CHEN Meng-jun, SASAOKA Takashi (2025). Shear fracture behavior and fracture fractal characteristics of granite under adverse effect of cyclic heating. Journal of Central South University. https://doi.org/10.1007/s11771-025-5994-3
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Frequently Asked Questions
How does cyclic heating affect granite's shear fracture behavior?
Cyclic heating exerts a pronounced adverse effect on granite's physical and mechanical properties, causing stress to propagate perpendicular to the fracture path and increasing tensile damage on fracture surfaces, which accelerates rock failure.
What is the role of fractal dimension in fracture analysis?
The fractal dimension of rock debris increases after cyclic heating, reflecting a higher degree of fragmentation and enabling quantitative assessment of fracture surface damage.
Why is investigating cyclic heating important for geothermal extraction?
Deep geothermal reservoirs experience cyclic temperature fluctuations during hydraulic fracturing, and understanding the resulting shear failures is critical for optimizing heat extraction and monitoring fracture propagation.
How can rock debris be used in enhanced geothermal energy extraction?
Analyzing the fractal characteristics of rock debris generated during staged fracturing allows real-time monitoring of fracture propagation within the reservoir rock mass.
What methods were used to study fracture characteristics?
The study assessed stress distribution, characterized two-dimensional fracture paths, quantified three-dimensional fracture surface damage, and determined fractal dimensions of debris under cyclic heating.
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