In construction practice, you have to meet with another type of soil with subsidiary clay soils.
In both swelling and in subsidiary clay soils, the work of piles will have its own specific features, the consideration of which goes beyond the scope of this book.
Compression of clay soils. The nature of the compressibility of clay soils is very complicated due to the presence of physically connected and immobilized water, pinched air and various structural ties. Compressibility due to great porosity can be very significant and usually stretches in time. This process is called, consolidation of clay soils.
In general, the process of compressibility of clay soil is depicted in the form of a compression curve, which, depending on the nature of structural connections (coagulation or mixed), has a different outline. Obviously, until the compression resistance is due to the strength of the connections, the soil will not be compressed. This condition of the soil corresponds to the compression curve of the segment AB. But as soon as the strength of the connections is disturbed, the soil will begin to compress intensively; Particles and water shells surrounding them will be involved in the work, the movement of particles will begin, as a result of which water will be squeezed and the humidity and porosity of the soil will decrease. On the graph, this process is shown by a curved area.
The ability of clay soils to thixotropic changes (thixotropia) is understood as a physicochemical phenomenon that occurs in soils under the influence of one or another effect (change, vibration, ultrasound, etc.) and consisting of two proceeding processes and hardening processes. Rightness occurs as a result of a violation of structural ties of soils and can be expressed as in the form of their thinning (full loss of strength), and the form of some softening (partial decrease in strength).
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