Without dwelling at a more detailed consideration of this issue described in the work, we will say a few words about the indicator that determines the ability of clay soils to thixotropic restoration under the influence of dynamic load (vibration).
As you know, due to the features of its action, vibration causes stretching and compressing stresses in the places of part -time contacts and their assemblies. While these stresses are small, they are balanced by the adhesion forces between the particles and the soil is not destroyed. But as soon as the stresses surpass the limit of the strength of structural connections, the particles will begin to move relative to each other, which will contribute to free water that occurs due to the transformation of physically connected and the liberation of immobilized water. As a result, there will be a destruction of the skeleton (frame) of the soil and it will acquire the ability to flow. This is how the Nizhnekembrian hydrrodyous semi -hard clay behaved during the vibration firewall, which was not under the action of a static load. This suggests that, if necessary, for any soils, you can choose such a fairly strong dynamic effect that will determine a very quick transition to a viscous state.
An indicator of the ability to thixotropic changes in this case will be the shallow. Its indicators qualitatively characterize the ability of soils to loss of strength due to violation of their structural ties. The higher the indicator of the unsteadiness, the less strength the structural connections have and the potentially higher their ability to thixotropic recovery. At the same time, it must be emphasized that the indicator of the shallowness does not yet make it possible to predict whether the restoration will appear with a given dynamic load. Obviously, in each case, it is necessary to at least approximately know what kind of exposure will undergo the soil. It has been established that under comparable conditions the strength of the soil decreases the more intense, the greater the amplitude of the oscillations.