Comparison between two and three dimensional seepage analysis of rock-fill dams constructed in narrow valleys a case study: La comparaison entre l’analyse de l’infiltration du barrage en enrochement a deux ettrois dimensions construit dans la étroit vallée : on étude de cas
2009 (English)Conference paper (Refereed)
Since seepage-related problems account for the cause of more than50% of dam failures, seepage analysis serves as one of the most significantstages in the design process of an embankment dam. Currently, a twodimensional (2D) seepage analysis in atypical or maximum cross section of thedam is performed instead of its three dimensional (3D) analysis for simplicity. Inthis way, little or no attention is paid to the seepage through side abutments.Moreover the role of grout curtain extensions into the side abutments andabutment material properties are inevitably neglected when performing a 2Dseepage analysis. In this paper, two and three-dimensional models of a rockfilldam during operation state are generated and several unsteady and steady stateseepage analyses are performed using finite element method (FEM). The resultsobtained from 2D and 3D seepage analyses were compared with measurementsfrom the instrumentation system installed in the dam body and foundation duringconstruction. It is concluded that for embankment dams to be constructed innarrow valleys, 2D seepage analysis results are far from reality and considering3D modeling of such dam sites is vital. In addition several designing andillustrative graphs were developed to calculate 3D discharge rates and hydraulicgradients from those obtained from 2D seepage analysis.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-49257OAI: oai:DiVA.org:kth-49257DiVA: diva2:459451
Commission internationale des grands barrages, Vingt Trosieme Congres, Des grands barrages, Brasilia. Juin 2009
QC 201111302011-11-252011-11-252011-11-30Bibliographically approved