Seite - 1357 - in Book of Full Papers - Symposium Hydro Engineering

deformation behaviour of dams in order to improve the understanding and to verify theoretical considerations. Fig. 8: Model and dam zoning Figure 8 shows the zoning of the cross section of the dam which was used for the current simulation. The upstream dam slope is inclined with 1:1.5 (V:H) and the downstream slope with 1:1.4. The width of the vertical asphalt core is 95 cm at the bottom decreasing gradually to 50 cm, which is maintained for the top 50 meters. The foundation of the dam is assumed to be on stiff rock. The finite element program Plaxis 2D was used throughout this analysis. The simulations were carried out with a 2D-plane strain model. The non-linear, elastoplastic Hardening Soil Model was used for the numerical analysis. The stress dependency is modeled with three different stiffness moduli: ref 50E for primary loading, ref oedE for oedometric loading, ref urE for unloading and reloading and the parameter m for the amount of the stress dependency. For details on the numerical analysis and material parameters, reference is made to [6]. Table 1 shows the material parameters used in the study. Table 1: Material parameters Zone Asphalt Concrete Core Transition Zone Gravel Transition Zone crushed rock Shoulder rockfill – well compaction Shoulder rockfill – bad compaction Bedrock Zone 1 2 3 4a 4b 6 Model HS HS HS HS HS LE E [kN/m²] - - - - - 300000 ν [ - ] - - - - - 0,3 E50ref [kN/m²] 15000 76000 95250 76200 50000 - Eoedref [kN/m²] 14.000 60.000 57000 68000 43000 - Eurref [kN/m²] 30000 210000 300000 210000 120000 - m [ - ] 0,21 0,48 0,25 0,45 0,4 - φ [°] 45 45 45 45 45 - c [kN/m²] 580 1 1 1 1 - ψ [°] 2 7 7 7 7 - νur [ - ] 0,2 0,2 0,2 0,2 0,2 - HS...Hardening Soil Model; LE...Linear Elastic Model Figure 9 depicts the vertical stress distribution of the analysed dam for the end of construction and for the first impounding. It can be seen from the graphs that the stress distribution at the end of construction is depending on the material 1357