![]() ![]() If the soil contains expansive clays, such as smectite, the soil will also begin to swell. Soils that are saturated, meaning all the pore spaces are filled with water, or nearly saturated have lower soil strength, and they will compact and smear more than the same soil under dry conditions. The higher the clay content of the soil, the greater the likelihood that the soil will hold water. ![]() Any texture finer than a sandy loam can be smeared if the soil is wet enough. When?Ĭompaction and smearing are more likely to occur with installations on sites with wet soils and high water tables with soil textures with higher silt and clay content. ![]() Plastic limit is defined as the minimum water content at which the mixture acts as a plastic solid and is easily checked in the field. If considerable construction activity has caused smearing or compaction, then the ability of the soil to transmit liquid will be seriously reduced and failure is more likely. Smearing is spreading and smoothing soil particles by sliding pressure. Compaction is the compression of soil particles, which closes the pore spaces. The surface should be maintained in as natural condition as possible because soils that are wet at the time of construction are more likely to have problems with acceptance of wastewater due to compaction and smearing. Get Systems/ATUs articles, news and videos right in your inbox! Sign up now. ![]()
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