Abstract
Effects of some protection methods against frost actions were experimentally studied. A filter layer of gravel or permeable thermal insulating material was set in the field test basins which were filled with frost susceptible soil. The filter layer used in this study can prevent capillary rise and permit seepage water downward. The amount of frost heave, frost heaving force, depth of freezing front and water transfer were measured during winter.
The main results of these experiments were as follows:
1) The amount of frost heave at the ground which has a filter layer of gravel or permeable thermal insulating material was about one-half or one-third of that at the untreated ground.
2) Bothh gravel layer and thermal insulating layer could cut off capillary rise completely.
3) When permeable thermal insulating material was used, the freezing front would be stopped in the filter layer.
