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Long-term stability considerations of water storage reservoirs for snow-making systems in the Alps
There is an ever increasing demand for large storage reservoirs for technical snow-making systems in ski areas. Dam heights greater than 15 meters and storage capacities of 200,000 m3 of water are common practice. Mostly flexible membrane liners are used as inner impermeable barrier. Due to the generally exposed locations of the reservoirs geological/geotechnical assessments are challenging. Besides evaluating the soil's mechanical properties as dam material, especially the subsoil conditions have to be investigated. Notwithstanding the possibility of performing numerical analyses and modeling variations, uncertainties in site conditions have to be taken into account. Durability of the membrane liner represents a key issue in determining the long-term behavior of such storage reservoirs. Potential leakage of the waterproofing system has to be taken into account in design calculations as well as in the long-term observational methods. Hence, properly designed monitoring systems are of importance when considering the actual and long-term deformation mechanisms and to control potential seepage phenomena in case of damage of the waterproofing membrane system. Regular observations and inspections shall be carried out to guarantee serviceability over the design life of the structure. Based on case studies the role of long-term monitoring surveys will be discussed.
Long-term stability considerations of water storage reservoirs for snow-making systems in the Alps
There is an ever increasing demand for large storage reservoirs for technical snow-making systems in ski areas. Dam heights greater than 15 meters and storage capacities of 200,000 m3 of water are common practice. Mostly flexible membrane liners are used as inner impermeable barrier. Due to the generally exposed locations of the reservoirs geological/geotechnical assessments are challenging. Besides evaluating the soil's mechanical properties as dam material, especially the subsoil conditions have to be investigated. Notwithstanding the possibility of performing numerical analyses and modeling variations, uncertainties in site conditions have to be taken into account. Durability of the membrane liner represents a key issue in determining the long-term behavior of such storage reservoirs. Potential leakage of the waterproofing system has to be taken into account in design calculations as well as in the long-term observational methods. Hence, properly designed monitoring systems are of importance when considering the actual and long-term deformation mechanisms and to control potential seepage phenomena in case of damage of the waterproofing membrane system. Regular observations and inspections shall be carried out to guarantee serviceability over the design life of the structure. Based on case studies the role of long-term monitoring surveys will be discussed.
Long-term stability considerations of water storage reservoirs for snow-making systems in the Alps
Langzeitstabilitäts-Betrachtungen für Wasserspeicherbecken für Schneeerzeugungssysteme in den Alpen
Marcher, T. (author) / Wechsler, H.G. (author) / Speckle, A. (author)
2009
6 Seiten, 15 Bilder, 9 Quellen
Conference paper
English
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