A certainly-element model is worked out soil-fundamental flag-overhead structure. The tensely-deformed state of fundamental flag is investigational taking into account the models of Winkler and Pasternak. On results a calculation charts are got diagrams sinking of fundamental flag.

Keywords: certainly-element model, Winkler elastic foundation, Pasternak elastic foundation,, coefficient of subgrade resistance, sinking of fundamental flag, stress-strain state