VALIDATION OF GROUND FRICTION FORCES ON THE LATERAL SURFACE OF THE PILE SHAFT AND UNDERGROUND CONSTRUCTION IN HYDROGEOLOGICAL CHANGES OF EXPLOITING FLOODING CONSTRUCTION SITE

It was performed the analysis of materials of engineering and geological surveys on the construction sites of civil and industrial projects in Dnepropetrovsk and the Dnepropetrovsk region. It was determined the correlation dependence of strength and deformation characteristics of soils from the soil moisture in the range of up Wρ to Wsat. It was found that strength and deformation characteristics of soils subject to the relation: ?э = ?о(1 ? 1,0Wэ); Сэ = Со(1 ? 1,5Wэ); Еэ = Ео(1 ? 1,5Wэ). It was proposed expression for calculation of the frictional force of the clay soil on the lateral surface of the pile shaft or an underground structure in the form of: R_f=U?_1^h?(σ_zq tgφ_э+C_о ) h . For printed, bored piles and tangential piles were found that changes in the hydrogeological conditions of the exploited area (inundation area) for change the bearing capacity of at the tip driven piles or soles of the underground structures are not observed. In addition, it was determined that the change of tangential piles conditions of the exploited area (flooding areas) reduces the deformability and strength characteristics of the underlying compacted soil platform and requires urgent check the bearing capacity of the underlying layer and the calculation of the foundation deposits.