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To begin with, we will understand what subsidence soil is - a soil that under the influence of external load and its own weight, or only from its own weight, undergoes vertical deformation when it is soaked with water or another liquid, that is, it sags. As a rule, soils with subsidence properties are loam and sandy loam. Subsidence soils are distinguished by two types of subsidence.
The first type of subsidence is when wet soil sags under the influence of additional load and dead weight.
The second type of subsidence is when wet soil sags only from its own weight.
If you can still work with the first type, scrupulously calculating and not exceeding the subsidence pressure, then you need to work with the second type of subsidence only, passing through it, bearing the load on the underlying non-subsiding layer.
Thus, construction sites with subsidence soils are the most problematic for construction, but the use of a screw foundation on the Pillar-Ukraine ground screws with the observance of building standards to prevent soaking allows building on such problem sites.
Quicksand is sandy loam, strongly diluted with water, which becomes so mobile that it flows like a liquid and therefore is called "quicksand". Due to their mobility and low bearing capacity, quicksand are unsuitable for use as bases. Quicksand come across as a homogeneous soil on the surface and this is more like a swamp, and sometimes come across as a layer between normal well-bearing soil layers. And it is precisely in this contrast between well-bearing soil and weak-bearing waterlogged that difficulties arise with the design and implementation according to classical schemes. The use of Pillar ground screws allows you to pass through the quicksand and support the foundation in a reliable ground.