Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Dynamic response of an asphaltic concrete core embankment dam considering core and filter interaction
Usually asphaltic concrete core embankment dams (acced) are designed and constructed in regions, in where there is not enough fine material or rainy weather causes an inappropriate condition for compaction of fine material in regular clay core embankment dams. Sometimes these embankment dams are designed and constructed in area with high seismic condition. Behavior of this kind of dams during earthquake motions are not known properly; however it is required to evaluate response of this kind of dams against earthquake motion. For instance, real reaction of each section of the dam body and their interaction should be identified especially in the asphaltic core with its thin thickness (less than 1 m). As some model tests like shaking tables, which have done in Tehran University, show that these small scales of acced will be stable after large earthquake motion, but numerical analyses show that minor cracks may develop in the asphaltic core. Both numerical analyses and model tests result in large deformation between core and filter, therefore these regions should be analyzed and designed very carefully. In this paper a typical 115m high asphaltic concrete core rock fill dam is considered. First different stages of construction and impounding are analyzed using Mohr-coulomb model and then dynamic analyses are carried out in the service condition. Dynamic analyses are performed using nonlinear model in the maximum credible earthquake MCE, 2/3MCE and 1/3MCE with .54g, 0.36g and 0.18g maximum accelerations. To model above-mentioned phenomenon (large settlements in filter zone) especially near dam crest, interface elements are used between asphaltic core and filter zone; thus large different displacements are modeled very clearly. Analyses show that there is different mode of vibration between asphaltic core and embankment dam body which causes high acceleration in the core and high displacement in the surrounding filter especially near crest elevation.
Dynamic response of an asphaltic concrete core embankment dam considering core and filter interaction
Usually asphaltic concrete core embankment dams (acced) are designed and constructed in regions, in where there is not enough fine material or rainy weather causes an inappropriate condition for compaction of fine material in regular clay core embankment dams. Sometimes these embankment dams are designed and constructed in area with high seismic condition. Behavior of this kind of dams during earthquake motions are not known properly; however it is required to evaluate response of this kind of dams against earthquake motion. For instance, real reaction of each section of the dam body and their interaction should be identified especially in the asphaltic core with its thin thickness (less than 1 m). As some model tests like shaking tables, which have done in Tehran University, show that these small scales of acced will be stable after large earthquake motion, but numerical analyses show that minor cracks may develop in the asphaltic core. Both numerical analyses and model tests result in large deformation between core and filter, therefore these regions should be analyzed and designed very carefully. In this paper a typical 115m high asphaltic concrete core rock fill dam is considered. First different stages of construction and impounding are analyzed using Mohr-coulomb model and then dynamic analyses are carried out in the service condition. Dynamic analyses are performed using nonlinear model in the maximum credible earthquake MCE, 2/3MCE and 1/3MCE with .54g, 0.36g and 0.18g maximum accelerations. To model above-mentioned phenomenon (large settlements in filter zone) especially near dam crest, interface elements are used between asphaltic core and filter zone; thus large different displacements are modeled very clearly. Analyses show that there is different mode of vibration between asphaltic core and embankment dam body which causes high acceleration in the core and high displacement in the surrounding filter especially near crest elevation.
Dynamic response of an asphaltic concrete core embankment dam considering core and filter interaction
Dynamische Reaktion eines Deiches mit Asphalt-Betonkern unter Berücksichtigung der Kern- und Filter-Wechselwirkung
Mahin Roosta, R. (Autor:in) / Ravasani Asl, Farhad (Autor:in)
2009
6 Seiten, 12 Bilder, 2 Tabellen, 11 Quellen
Aufsatz (Konferenz)
Englisch
Damm , Dammbau , Deich , Erdbau , Erdaufschüttung , Aufschüttung , Böschung , Erddamm , Standsicherheit , Festigkeit , Erdbeben , Erdbebenwelle , Seismologie , Bodenmechanik , Bodendynamik , Erde (Boden) , Lockergestein , Bauingenieurwesen , Vibration , numerische Analyse , mathematische Modellierung , Iran
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