Calculating frost penetration in soils








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Table 7 summarizes typical frost penetration characteristics observed for each SMP site. The extreme frost predictions for U. The review indicated that even for similar frost depths, the observed profiles varied from site to site and year to year. The computed maximum frost penetration depths were compared to the historical frost penetration values, as published in the climatic maps developed by NOAA 1 and Environment Canada. Soil thermal conductivities can be obtained from Figures 1 through 3 from Kersten, [1] and Air Force, [2].. The first and the last months with freeze conditions are based on the worst case scenario. The graph in figure 24 shows a good overall agreement between LTPP and historical maximum frost depth predictions.

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Frost Design Practice In Canada

Frost penetration profile showing shallow freeze cycles in the fall followed by solid deep freeze with spring thaw. Comparison of frost penetration depths. Frost penetration profile showing solid freeze with partial spring thaw and refreeze. Use of the above equations to estimate k is more accurate than use of Figures 1 and 2. To describe frost penetration profile characteristics, frost depth was characterized as shallow, medium, or deep. Soil thermal conductivities can be obtained from Figures 1 through 3 from Kersten, [1] and Air Force, [2].. The FI contours for both Figures 4 and 5 are only approximate.

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Estimation of the depth of frost penetration in both

The freeze depths were measured in dug holes often along the edge of the main lanes. For design purposes, generally use freezing or thawing index based on three coldest winters or warmest summers in last 30 years of record. Some equations and variables in this section are expressed in English units only due to their source. Figure 4 and Table 6 provide an overview of Washington State mean FI data summarized for to Differences between air and surface temperatures are influenced by.. Frost penetration profile showing shallow freeze cycles in the fall followed by solid deep freeze with spring thaw. The review indicated that even for similar frost depths, the observed profiles varied from site to site and year to year.

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Description: Some equations and variables in this section are expressed in English units only due to their source. Based on the referenced study Rutherford et al. For example, several SHAs use the rule-of-thumb that the pavement structure should equal at least one-half of the expected depth of freeze. The freeze depths were measured during February and January and February a total of holes. Freeze state determined by the analyst from ER and moisture. For Arizona site and Nevada site , the first interpretation depth was lower than the expected frost penetration depth. Freeze state based on temperature data using 0 o C freezing isotherm, not forced. Figure 8 shows contours of measured depths of freeze as determined during the extremely cold winters of and letter correspondence from B. Severity of Frost Penetration Using the results of the frost penetration analysis, average and maximum frost depths were determined, along with the first and the last cold month with freeze conditions for each LTPP site with in-situ measurement data.
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