Experimental Study on Ice Mechanics of PUR-Revetment Structure
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Abstract:
PUR-revetment is a newly developed method for hydraulic engineering application. Its structure is similar to that of open stone asphalt revetment, but the crushed stones are glued by polyurethane (PUR) instead of bitumen. In order to study the characteristics of applying PUR-revetment in cold regions, an experimental research of the stability of PUR-revetment under the frost heave force and ice pushing was conducted based on the prototype test conditions of ice thickness and temperature processes in the Hongqipao Reservoir of Daqing. The process curves of internal temperature, ice growing, deformation, and mechanical characteristics were analyzed to obtain the following conclusions: (1) the porous structure of PUR-revetment can result in the uniform distribution of temperature field under the revetment; (2) during the freeze-thaw cycle, a larger vertical deformation and a smaller slope deformation of PUR-revetment occur, but both deformations cannot recovery completely, thus it is necessary to take reinforcement measures at the roof support and slope foot during the designing process; and (3) the maximum ice pushing occurs during the thawing period, therefore appropriate icebreaking measures need to be performed to eliminate the effects of ice pushing on the revetment structure.
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