Seite - 823 - in Book of Full Papers - Symposium Hydro Engineering

Because of the need for more accurate determination of the state of the dam, an automatic measurements of several parameters, mainly hydrostatic and partly hydrodynamic, began in 2003. In 2005 an automated monitoring system for determining the dynamic response of the dam to strong earthquakes, i.e. when the peak ground acceleration exceeds 0.05 g, was established (see Table 1). Monitoring system of the Mavčiče Dam behaviour includes: deformation measurements (vertical, horizontal and relative displacements, see Fig. 4), visual inspections (structural, geotechnical), groundwater measurements (piezometric levels, uplift pressures, temperatures, specific electrical conductivities) and measurements of external loads on the dam. The latter are carried out in the reservoir, in the stilling basin, in the dam itself (including the inspection gallery and the crest of the dam), as well as on the ground surface about 150 m downstream from the dam [4, 5]. Automatic parameters are shown in Table 2. Fig. 4 The monitoring system for measurements of vertical and relative displacements Table 1 The establishment of the technical monitoring system Year Established monitoring activity 1986 Manual measurements and visual inspections 1999 - 2000 Additional deformation measurements (right bank) 2003 Automated measurements (hydrostatic, partly hydrodynamic) 2005 Automated measurements (dynamic - strong earthquakes) R19 D5 R0 R1 D3 R24 R27 R29 R30 R25 R20 R21 R22 R23 R26 R14 R15 R16 D7 R6 D2 D1 0' 1' 2' 3' 4' 5' 6' 7' 8' 9' 10'0 1 2 3 4 5 6 7 8 9 10 5m D11 ,D12 R33R38 R17 R31R35R34 D14 15 D6 D8 R18 R32 R36 D13 R37 D4 R28 D9, D10 A C C E S S R O A D R1, A, 1, 1' - POINTS FOR VERTICAL DISPLACEMENTS D1 - POINTS FOR RELATIVE DISPLACEMENTS OF EXPANSION JOINTS AND CRACKS EMBANKMENT DAM ERECTION BAY MACHINE HALL 823