Improving dams and dikes strength and resistance to erosion by means of lime treatment
Herrier, G.; Bonelli, S.; Nerincx, N.; Tachker, P.; Peeters, P.; Puiatti, D. (2020). Improving dams and dikes strength and resistance to erosion by means of lime treatment, in: Proceedings of the Fourth International Dam World Conference, Portugal, Lisbon, LNEC, September 21-25, 2020. pp. [1-19]
In: (2020). Proceedings of the Fourth International Dam World Conference, Portugal, Lisbon, LNEC, September 21-25, 2020. [S.n.]: [s.l.]. , more
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| Available in | Authors |
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Document type: Conference paper
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| Keywords |
Dikes
Earth dams
Erosion resistance
Topographic features > Banks (topography) > Embankments > Levees
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| Author keywords |
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| Authors | | Top |
- Herrier, G.
- Bonelli, S.
- Nerincx, N.
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- Tachker, P.
- Peeters, P., more
- Puiatti, D.
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| Abstract |
Lime treatment is a well-known technique of soil improvement and stabilization, allowing the reuse of silty and clayey soils for earthworks execution, enhancing their engineering properties and behavior. The principles and methodologies of lime treatment of soils are recognized through existing specification documents, guides, recommendations, mainly for applications such as roads and highways, platforms, airports, railways. The interest of the dams and dikes community regarding this technique is currently growing. During the last decade, the benefits of lime treatment according appropriate treatment technologies were shown at the laboratory and on site, and in the same time relevant and successful examples of existing hydraulic structures using lime treated soils, could be referenced worldwide.
This communication deals with the performance levels reached by lime treated soils, some associated designs, and their application. It reviews the most significant recent results in terms of improved mechanical strength, watertightness, resistance to internal erosion and resistance to surface erosion. Regarding surface erosion and protection structures, we detail several overflowing test campaigns, which illustrate the possibilities offered by this solution as a levee protection material. Also specific designs and construction modes were built and tested, and will be discussed.
As for now, on top of reuse of poor soil available at site, a designer can consider mechanical and hydraulic performance of lime-treated soils to optimize a water retaining structure project. Main benefits for the owners are:
- limiting the need of valuable materials (depending on site conditions);
- simplifying the typical cross section;
- possible grass covering over the whole embankment;
- global cost reduction and material transport reduction.
These results are analyzed in the light of the reassessment of the consequences of climate change on hydrology, and the assessment of floods, leading to unplanned overflows during the design phase.
An ICOLD Committee "CMD" (Cemented Materials for Dams) is currently working on the redaction of a specific bulletin CSD "Cemented Soil Dams", related to those topics and innovations. This bulletin will be available in 2021 and presented during the ICOLD event in Marseille (France).
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