ABSTRACT
The nature and principles governing expansion of soils in large tracts and under foundations of structures do not differ from those considered earlier. Thus, deformation of soil due to swelling in large tracts as well as under foundations increases with greater loosening of the soil particles, smaller moisture content, increasing density etc. The rate of swelling of a soil mass depends on the textural features of soils. In a large tract the Kimmeriisk soils swelled more rapidly than others, which is explained by the presence of a large quantity of sand particles which augments their permeability. Drying of the soil in the trenches affected the nature and magnitude of swelling of the soil mass. This was observed during tests conducted on Sarmatsk soils. The principles governing swelling of soil subjected to an external load were studied within a stressed zone under test footings.
