Page - 1463 - in Book of Full Papers - Symposium Hydro Engineering

The nonlinear behavior of the masonry and the fissured rock subsoil is simulated using isotropic and anisotropic elastoplastic Mohr-Coulomb material models with tensile stress limitation. The position and orientation of the separating surface layers are also considered in the constitutive models. Virtual horizontal separation surfaces are taken in account to allow for stress free openings in vertical direction. Material parameters of the final calibration of the model can be found in Table 2. Fig. 2 illustrates the constitutive models used for the masonry dam, the intact rock and the joints. The final material properties from the calibrations are summarized in Table 2. The boundary conditions are defined to prohibit the model to move in normal direction to the rock boundaries. The load history is taken into account in all load case combinations (LS) according to the composition in Table 1. The individual loads are multiplied by the corresponding partial safety factors from [1]. Table 1 Load steps of the nonlinear simulation Loadstep Action LS1 Deadweight foundation (Initial Stress State) LS2 Deadweight dam LS3 Hydrostatic water pressure for defined water level LS4 Hydrostatic water pressure at the level of anchor pre-stressing (241,605 m NN) LS5 Anchor activation LS6 Anchor pre-stressing LS7 Hydrostatic water pressure for defined water level LS8 f. Additional varying loads according to Eurocode [1] Non-stationary thermal finite element calculations are carried out for the determination of the temperature stresses in the dam. The external temperatures in the Hessen region are extracted from [7]. The water temperatures are taken into account in the thermal calculations as a function of time and water depth according to temperature data available at BAW (Federal Waterways Engineering and Research Institute).The 3D pore water pressure fields are calculated with a transient thermal analysis using a temperature-flow analogy. 4. MODEL CALIBRATION AND VERIFICATION In order to increase the realistic proximity of the simulation model and thus to achieve a high quality of the stability tests, the simulation model is calibrated with deformation measurements of the dam. The measured deformation points are shown in Figure 3. Furthermore, pore water pressure and temperature measurements are to verify the hydraulic and thermal analyses. 1463