首页|Basic friction angle of granite fracture after heating and rapid cooling treatments
Basic friction angle of granite fracture after heating and rapid cooling treatments
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
? 2021Temperature-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.
Basic friction angleEffects of size and tilting rateGranite fractureLiquid nitrogen coolingThree-core tilt testWater cooling
Tang Z.C.、Xiao S.、Peng M.H.
展开 >
Faculty of Engineering China University of Geosciences
Department of Civil and Environmental Engineering Clarkson University
NSTL
Elsevier
