Experimental Study on Three Point Bending of Granite after High Temperature Quenching and Thermal Cycling

ZHANG Fan; L&#xDC; Dun-bo

doi:10.11988/ckyyb.20220153

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Journal of Changjiang River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (7) : 96-103. DOI: 10.11988/ckyyb.20220153

Rock-Soil Engineering

Experimental Study on Three Point Bending of Granite after High Temperature Quenching and Thermal Cycling

ZHANG Fan, LÜ Dun-bo

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Abstract

High temperatures have a significant impact on the mechanical properties of rocks in geothermal reservoirs. To investigate the influence of high temperature on the fracture toughness of Type I granite, three-point bending tests were conducted on semi-circular bending (SCB) samples of granite subjected to cyclic high-temperature quenching at 400 ℃ for different numbers of cycles (1, 3, 5, and 7 cycles). The failure characteristics, load-displacement curves, and fracture toughness of the granite specimens after cyclic high-temperature quenching were also analyzed. Results demonstrate that as the number of thermal cycles increases, the mass and density of granite gradually decrease, the peak load continuously declines, the roughness of the fracture surface progressively intensifies, and the fracture toughness noticeably reduces. These findings provide a theoretical basis for the development of geothermal energy and the safety of underground engineering structures.

Key words

granite / high temperature quenching / thermal cycling / fracture toughness / three-point bending test

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ZHANG Fan, LÜ Dun-bo. Experimental Study on Three Point Bending of Granite after High Temperature Quenching and Thermal Cycling[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(7): 96-103 https://doi.org/10.11988/ckyyb.20220153

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