Abstract
The experiments on the mechanism of damage of relatively small sized concrete U-trough with ground freezing were made. For this purpose, 450 millimeter concrete U-troughs specified in JISA-5305 were experimentally set, and the collapsing force, deformation, and so on arise at the troughs in winter season were measured. Through this study, the following results were obtained. 1) The collapse of concrete U-trough occured after ground freezing mainly had origin in frost heaving. 2) Under a certain condition, the magnitude of frost heaving pressure acting on the trough was far over the destruction resistance of tested trough. 3) The effect of some countermeasures attempted in this study were evidently recognised.
