Page - 1025 - in Book of Full Papers - Symposium Hydro Engineering

3.2. ACTIONS VARIATION DURING THE FIRST FILLING OF THE RESERVOIR The specific monitoring plan for the first filling of the reservoir defined a set of stages at which the filling was suspended to do general observation campaigns and to perform the dam’s behaviour evaluation [6]. The first filling of the reservoir began in December 2013, was interrupted in 3 main intermediate filling stages (FS1, FS2 and FS3, at water levels 180 m, 206 m and 224 m, respectively) and in 2 stabilization levels (SL1 and SL2, at water levels 216 m and 231 m, respectively), and was completed in April 2016 (FS4), when the NWL reached an elevation of 234 m (Fig. 4). The first filling lasted about 28 months. Fig. 4 Water level variation during the first filling of the reservoir As the uplifts had small variations during the first filling, the water loads were represented only by hydrostatic pressure increments on the upstream surface of the dam, considering γw=10 kN/m3. The thermal variations in the dam’s body were computed from the monitored temperatures in concrete, air and water, considering a numerical procedure to spread the observed values in a set of discrete points to all the mesh nodes of the dam’s structure. Fig. 5 represents, as examples, the temperature fields observed in two stages of analysis, August 2014 and December 2015. A linear thermal dilation coefficient was considered for the concrete α=1.1x10-5 /ºC. -2 0 2 4 6 8 10 12 100 120 140 160 180 200 220 240 Upstream level Downstream level FS1 (180 m) FS2 (206 m) SL1 (216 m) FS3 (224 m) SL2 (231 m) FS4 (NWL=234 m) Speed of water rise (m) (m/day) 1025