Abstract
The study of the dynamic fracture properties of granite after heating and water-cooling treatments is of great significance for analyzing the sustainability and stability of geothermal reservoir rocks. This work investigated the effects of high temperature and water-cooling treatments on the mode I dynamic fracture characteristics of granites. Notched semicircle bending (NSCB) specimens were exposed to five temperatures of 200, 400, 600, 800, and 1000 °C. A Separate Hopkinson Pressure Bar (SHPB) system was used to conduct dynamic fracture tests on NSCB specimens with four impact pressures (0.10, 0.20, 0.30, and 0.40 MPa). The granite microstructure characteristics were obtained through mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) tests. A 3D scanner was applied to examine the fracture surface of the NSCB specimens. The fractal dimension of the fracture surface was calculated with the cube covering method. The results show that the damage degree of the granite specimens could be divided into two stages with a critical temperature of 400 °C. The porosity was less than 2.20% when the heating temperature was below 400 °C, and the porosity increased rapidly for heating temperatures above 400 °C. The fracture toughness, fracture energy, and kinetic energy of the NSCB specimens increased with loading rate, while the fractal dimensions of the fracture surfaces decreased with loading rate. Both dynamic fracture toughness and fracture energy showed a power function decline trend with an increase in the fractal dimensions of the fracture surface. Finally, the effects of impact pressure and heating temperature on the fracture behavior of granite specimens were discussed.
Highlights
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The dynamic fracture properties of rocks after heating and water-cooling treatments were studied.
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The influence of the microstructure on the fracture properties of granite was analyzed.
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The roughness of the fracture surface was accurately calculated using the self-written MATLAB program based on the cube covering method.
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The influence of the loading rate and the heating and water-cooling treatments on the roughness of the fracture surface was discussed.
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Acknowledgements
The work is supported by financial grants from the National Natural Science Foundation of China (Grant no. 52179118, 51979272, 51879150 and 52104101). The authors are very grateful for the financial contribution and convey their appreciation for the support of this basic research.
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DW: investigation, data curation, and writing—original draft. LY: conceptualization, funding acquisition, and writing—review and editing. MJ: methodology, validation, writing-review and editing, and funding acquisition. SL: writing—review and editing, and funding acquisition. RL: writing—review and editing, and funding acquisition. HS: writing—review and editing. LZ: investigation.
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Wu, D., Yu, L., Ju, M. et al. Study on the Mode I Fracture Properties of Granites After Heating and Water-Cooling Treatments Under Different Impact Loadings. Rock Mech Rock Eng 55, 4271–4290 (2022). https://doi.org/10.1007/s00603-022-02865-0
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DOI: https://doi.org/10.1007/s00603-022-02865-0