The article presents the results of physical simulation of the formation of a dip over the mine workings. For this purpose, similarity criteria are substantiated and an experimental stand is developed. On samples of quaternary loam and clay it is proved that the velocity of the motion of the dip depends nonlinearly on the moisture content and exponentially damps in time.

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Structuring processes in clay soils after their cementation have been considered. A new indicator of soil cementation is proposed, by which it is possible to evaluate the deformation and strength properties of soils depending on the volume of injected cement.

In the article it had been presented the research results of deformation and strength properties of clay grounds around drill-injection piles. It had been proved important improvement of wet clay loam properties based on the research of compatibility, changes in the total modules of deformation and shearing characteristics. It were obtained empirical models.