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Basic Friction Angle of Granite Fracture After Heating and Rapid Cooling Treatments by Zhi Cheng Tang; Meng Hong Peng; Suguang Xiao is a Engineering article available to read on EtoBox.

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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 und

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Author

Zhi Cheng Tang; Meng Hong Peng; Suguang Xiao

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)