NDLI: Embankment dam foundation analysis for the decrease of internal erosion likelihood

Content Provider	Springer Nature Link
Author	Smith, Marc
Copyright Year	2012
Abstract	A zoned embankment dam is founded on clay underlain by a sand deposit. Major seepage phenomena were noticed in the foundation downstream from the dam where the vertical seepage forces in the sand layer were expected to exceed the downward forces due to the overlying clay. Modern technologies were applied to delineate critical zones to help design optimal rehabilitation measures. A global electromagnetic survey was carried out to detect and map the main sources, pathways and exits of seepage. Based on these global findings, a more detailed analysis was then conducted to identify zones where thickness of the foundation clay is minimal, pore pressures in sand are higher and thus where the factor of safety against uplift is lower and internal erosion is more likely to occur.Clay thickness evaluation required the determination of land surface as well as clay-sand contact elevations. A laser airborne survey was performed to model the land surface elevation. Data concerning the clay-sand contact elevation came from the interpreted stratigraphy based on a series of boreholes and cone penetration tests. This data was combined in a geostatistical model along with the measured piezometric levels in the foundation. This resulted in a contour map showing factors of safety against uplift over the entire downstream area.The use of modern technologies, namely electromagnetic and laser surveys as well as geostatistical tools, was instrumental in defining the limits of an otherwise spread-out problem and to provide an optimal solution, in terms of costs and effectiveness, for the long-term stabilization of the foundation.
Starting Page	431
Ending Page	436
Page Count	6
File Format	PDF
ISSN	20952430
Journal	Frontiers of Architecture and Civil Engineering in China
Volume Number	6
Issue Number	4
e-ISSN	16737512
Language	English
Publisher	SP Higher Education Press
Publisher Date	2012-11-09
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	seepage detection geostatistical analysis dam monitoring internal erosion LIDAR survey Cities, Countries, Regions Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Architecture Civil and Structural Engineering

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