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Basic friction angle of granite fracture after heating and rapid cooling treatments
Abstract Temperature-dependent basic friction angles of granite fractures were investigated through three-core tilt tests with different heating temperatures, cooling treatment methods, specimen sizes, and tilting rates. Specimens were first heated to a predetermined temperature, then rapidly cooled to room temperature using two different cooling treatments (i.e., water and liquid nitrogen). The results indicated that the basic friction angles of thermally treated granite fractures increased linearly with the rise in heating temperature which could be mainly attributed to surface conditions altered by thermal stresses. The microcracks of the specimens subjected to thermal treatments were characterized using P-wave velocities and scanning electron microscope images. The basic friction angles increased as specimen sizes increased when the heating temperature was 400 or 800 °C. The tilting rate also had a significant impact on the basic friction angle of granite fractures subjected to the thermal treatments. The overall trends of the testing results with the two types of thermal treatment methods were similar when the heating temperature was 400 °C, while different evolutions were observed under the heating temperature of 800 °C. This study can provide some referential value for the stability analysis of jointed rock masses subjected to high temperature (e.g., geothermal exploration and nuclear waste disposal), and also the protection of stone cultural relics suffered from fire.
Highlights Basic friction angles of granite surfaces after heating and two different rapid cooling treatments are investigated. Temperature-dependent mechanisms are analyzed. Influences of specimen size and tilting rate on the basic friction angle of granite are studied.
Basic friction angle of granite fracture after heating and rapid cooling treatments
Abstract Temperature-dependent basic friction angles of granite fractures were investigated through three-core tilt tests with different heating temperatures, cooling treatment methods, specimen sizes, and tilting rates. Specimens were first heated to a predetermined temperature, then rapidly cooled to room temperature using two different cooling treatments (i.e., water and liquid nitrogen). The results indicated that the basic friction angles of thermally treated granite fractures increased linearly with the rise in heating temperature which could be mainly attributed to surface conditions altered by thermal stresses. The microcracks of the specimens subjected to thermal treatments were characterized using P-wave velocities and scanning electron microscope images. The basic friction angles increased as specimen sizes increased when the heating temperature was 400 or 800 °C. The tilting rate also had a significant impact on the basic friction angle of granite fractures subjected to the thermal treatments. The overall trends of the testing results with the two types of thermal treatment methods were similar when the heating temperature was 400 °C, while different evolutions were observed under the heating temperature of 800 °C. This study can provide some referential value for the stability analysis of jointed rock masses subjected to high temperature (e.g., geothermal exploration and nuclear waste disposal), and also the protection of stone cultural relics suffered from fire.
Highlights Basic friction angles of granite surfaces after heating and two different rapid cooling treatments are investigated. Temperature-dependent mechanisms are analyzed. Influences of specimen size and tilting rate on the basic friction angle of granite are studied.
Basic friction angle of granite fracture after heating and rapid cooling treatments
Tang, Zhi Cheng (author) / Peng, Meng Hong (author) / Xiao, Suguang (author)
Engineering Geology ; 302
2022-03-20
Article (Journal)
Electronic Resource
English
Physico-mechanical properties of granite after thermal treatments using different cooling media
| Elsevier | 2024
Mechanical Characteristics of Granite After Heating and Water-Cooling Cycles
| Online Contents | 2019