3-D FEM Emulation Computation on Surrounding Concrete of Steel Spiral Case Keeping Internal Pressure during Construction

The surrounding concrete of steel spiral case in the power station of Three Gorges Project is constructed by means of keeping a specific level of internal pressure during construction. For analyzing the contact behavior of the interface between the steel spiral case and its surrounding concrete, the numerical simulations according to the actual construction procedure are carried out with 3-D FEM. The variation of the gap and the interaction force between the steel spiral case and its surrounding concrete in different operation stages and different seasons are put forward.