Seite - 1358 - in Book of Full Papers - Symposium Hydro Engineering

stiffness of the dam zones. Arching effects may arise at the end of construction due to the stiffness difference between the core and the adjacent zones, slightly reducing the vertical stress in the core. During impounding, the stress distribution in the dam significantly changes due to the rotation of the principal stresses and the buoyancy of the upstream dam shoulder. Arching effects originating from the dam construction mostly disappear. Fig. 9: Effective vertical stress at the end of construction and for impounding Figure 10 shows the horizontal effective stress distribution during construction and impounding. At the end of construction, the graph shows a homogenous distribution. For the impounded state, the horizontal stress significantly changes in the bottom zones adjacent to the core. While the horizontal stress decreases in the upstream dam shoulder, high horizontal stress arises downstream close to the plinth. Fig. 10: Effective horizontal stress at the end of construction and for impounding 1358