A detached unheated building located on frost heaving soil may show no signs of distress owing to the fact frost penetration design period the foundation has been raised uniformly so that no stresses have been induced in the structure. It has been found that all the water in soil does not freeze at the same temperature. As thawing proceeds downward from the surface in the frost penetration design period, these ice lenses thaw and contribute water to the soil. Run-off water from buildings should be directed away from critical areas by proper landscaping around the building. This may also occur where the building has supports carried on footings located inside the structure.
DESIGN GUIDE FOR FROST-PROTECTED SHALLOW FOUNDATIONS
An upward movement of the subgrade resulting from the expansion of Subfreezing temperatures (freezing temperatures must penetrate the soil and, Such an estimate is helpful in designing for frost conditions, but oversimplifies the . Depth of freezing and thawing depends in part on the magnitude and duration of the temperature differential below or above freezing (32 °F) at the ground surface . For design purposes, generally use freezing (or thawing) index based on. PAVEMENT DESIGN FOR SEASONAL FROST CONDITIONS. Mobilization .. resumed. In some cases, there may be only one frost-melting period, .. penetrate to only a limited depth into frost-susceptible subgrade soil.
translation and definition "frost penetration", Dictionary English-English online
Among meteorological factors such as air temperature, sunshine, precipitation, and wind velocity, air temperature is probably the most significant. When wet soil freezes, the main process is the physical change of soil water from liquid to solid that turns the soil into a hard mass resembling concrete. Due to the protection provided by the building, the penetration of frost under the interior column footings may be less than that under the perimeter footings. Pressure is developed so that the ice and soil above it are lifted. Under these circumstances there is a possibility that differential movement will occur. At the freezing plane, the water in the soil turns to ice. Soil moisture can also be controlled by careful attention to drainage, so that the extent of frost heaving is greatly reduced.
Frost depth is an essential factor in design of various transportation reliable models for predicting the frost depth during freezing period in. Under special conditions the frost group classification adopted for design may be of supporting capacity, including possible severe weakening during frost- melting periods. LIMITED SUBGRADE FROST PENETRATION METHOD. ways to calculate frost penetration: theoretically or actual field frost depth with freezing index information Based on the Period to Prepared jointly .