Earth-fill work in the winter on the Saratov Hydroelectric station
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In the winter time it was found possible to reduce the compaction requirements of the earth-fill work on the Saratov HES with satisfactory results. Attempts to impose more rigid requirements for some of the important structures led to negative results.
Earth-fill work during the winter must be regulated by the temperature regime and minimum conditions should be set up for each locality.
Winter work should be more exact and intensive in performance and requires added measures, such as warming of truckloads, clearing of snow, etc.
For any given specified density of fill, summer and winter work are different in the following respects:
Winter work results in lesser uniformity, due to a greater number of more closely spaced boundaries between fill blocks and compaction blocks.
Due to partial freezing even with normal compaction, winter fills will have alternate layers (or lenses) of frozen and unfrozen ground. These layers act as local water channels. In the spring and during winter thaws these layers are subject to irregular filling with water. In cases of frost recurrence the freezing causes an irregular pattern of partial decompaction of the soil.
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