The complex of field researches by plate load tests on loamy and loam sandy soils of water-saturated bases on the construction site of New Airport Astana have been carried out by the authors. The means for reconstruction of the airport in capital of Kazakhstan are allocated as the grant by Japanese Bank for Development and Reconstruction, and also the Japan company “Marubeni” taking active part in the construction. And also the spatial task by a method of final elements for estimation of stressed – deformed condition of water-saturated bases is solved. The elastic and plastic model of soil, supposing elastic work within the limits of surface, described by criterion Mor-Kulon and coextensive current on this surface is considered. As a result of the numerical analysis the model of soil environment for the forecast of the stressed-deformed condition of water-saturated base is chosen.