Dear reader we have discussed about distribution of loess soil in United States in our previous post. These wind transported soils are also found in wide areas of Chain, Southern Europe which include Ukraine and southern Russia, Siberia and some regions of Western Europe.
So these soils cover many regions of the world and their properties are important for geotechnical engineers to use it as foundation bed of many civil engineering projects.
We have already learnt that loess is mainly silt sized particles that are deposited by accumulation of dust transported by wind energy. About particle size we can include that typical silt lies between (0.01-0.05) mm.
Loess consists of feldspar and quartz which is cemented with iron oxide or calcium carbonates. As discussed in previous post they have some amount of clay particles that provides cohesion to these soils to remain stable under unsaturated condition.
They have around twenty percent clay. The remaining factions are fulfilled by sand and silt. The cementing action discussed above becomes null when soils get saturated which leads to a compressible and soft deposit unable to support our regular structural loads.
We will discuss about determination of collapse potential of collapsible soil like loess in our upcoming posts. We will finish this topic in next part to come recently.