Abstract
In this study, the effects of various geometric parameters of a dam in 2D static analysis of stress-strain on the upstream slope of the asphaltic concrete core rockfill dams were investigated. For this purpose, first the geometric characteristics of a large number of world's dams were collected and assessed, then by geometric modeling of these dams, many numerical models were developed for static analysis using GeoStudio software in eight height classes, three cases of upstream and downstream slopes, three different shape and thickness of the asphaltic concrete core under different Impounding states including "Full Reservoir", "Half full Reservoir", "End of construction and "Rapid Drawdown on a rigid type of foundation. The results of this study demonstrated that in four different construction and impounding states and in three different cases of slopes, Increasing the height parameter, causes increasing the Maximum total stress, Maximum total strain, Shear strain and Maximum shear stress for all construction and impounding states. The Maximum total stress decreased for all operating situations as the upstream slope reduced. According to the obtained results from the static stress-strain analysis, increasing both vertical and inclined asphaltic concrete core thicknesses, leads to decreasing the Maximum shear stress in Full Reservoir state but it increases in other state of impoundment. Moreover, by comparing the displacements related to specified points on the upstream slopes, increasing the height parameter, leads to increasing both horizontal and vertical displacements, the volumetric strain, deviator strain and deviator stress for all impounding conditions. In the following, the additional results were provided along with diagrams for further analysis.
Highlights
OF THE STUDYValstad et al, studied the Storvatn Dam with 90m high in Norway and using Newmarkmethod, showed that in severe earthquakes, the thin asphaltic concrete diaphragms in some areas near the crest of the dam were damaged and cracked (Valstad et al, 1992).Hoeg conducted a study on the Storvatn Dam and found that if the dam slopes were very steep, large shear strains might develop in the top of the dam's asphalt concrete core
After performing the static stress-strain analysis, assessing and comparing the results, the maximum values of the total stress, strain, shear strain, deviator stress, shear stress, deviator strain, volumetric strain and vertical and horizontal displacements at specified points (T, M and B) on the upstream slope were obtained for three slope cases (Case-1 ~ Case-3) and the four different construction and impounding stages
In addition to the general results presented in the comparative diagrams of upstream slopes, other results were presented in detail as follows: 3.7
Summary
Despite the passage of thousands of years of the dam industry, design of dams, especially Rockfill and Embankment dams, is still based on taste and initiative. This initiative must be approved by scientific standards and criteria. The use of Central or Inclined asphaltic concrete core for Rockfill and embankment dams in all over the world, especially in Europe, has become the most popular and reliable method for experts in this field. Despite all the advantages of these dams, it is still important to study, analyze and understand the static and dynamic behaviors of these structures, especially in critical points
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