Page - 1134 - in Book of Full Papers - Symposium Hydro Engineering

Länderarbeitsgemeinschaft Wasser (LAWA), Arbeitsgruppe Hydrologie, Hochwasser (AH), Nürnberg, 2017. [13] DWA M-514. Bauwerksüberwachung an Talsperren. Merkblatt Nr. 514, Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e. V. (DWA), Hennef, 2011. [14] DWA M-522. Kleine Talsperren und kleine Hochwasserrückhaltebecken. Merkblatt Nr. 522, Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e. V. (DWA), Hennef, 2015. [15] Haselsteiner, R. Maßnahmen zur Ertüchtigung von Deichen. Korrespondenz Wasserwirtschaft (KW), Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall e. V. (DWA), Hennef, Heft 3/08, S. 139 – 149, 2008. SUMMARY An overview of different definitions for ageing is given. Generally ageing depicts a time-dependent alteration and deterioration of material characteristics and/or the complete dam structure. Internationally accredited life cycle approaches are shortly discussed. In modern dam management life cycle considerations are state of the art starting with the design phase. The ageing of typical materials, such as clay, geotextiles, concrete, etc. is an important aspect to assess the ageing of complete structures. The long-term behaviour of soils and the underground is more difficult to assess or to predict than the behaviour of artificial materials such as concrete and geosynthetics. For latter materials ageing was investigated in the past precisely. Recommendations for the design are provided as well as counter measures against the deterioration effect of ageing on the structure. A safety margin should be considered within the design phase in the context with stability analysis and serviceability aspects. The sooner negative ageing effects are detected, the earlier countermeasures can be taken. Early measures are generally cheaper and more efficient than trying to rehabilitate a severely damaged embankment. Measures reach from easy works which can be handled during maintenance routines to a complete demolition and re-construction of the embankment dam. 1134