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Slurry cut-off wall and dynamic compaction works

Foundations

Berg River
South Africa

Client : Tcta/dwaf
Main Contractor : Berg River Joint Venture
Consulting Engineer : Brc
Works Carried Out: : Slurry Wall And Dynamic Compaction
Date Of Works : July 2004
 

Main Quantities

  • 35,000 square metres of heavy dynamic compaction ground improvement works to treat up to a depth of 8m.
  • Temporary and permanent works slurry cut-off walls using a variety of excavation techniques (5000m2 of slurry cut-off walls).


Innovative geotechnical works at the Berg River Dam project near Franschoek

The Berg River Dam project involved a range of complex and innovative geotechnical works at this vital Western Cape infrastructural project.

The soil conditions at the project were highly complex and variable, enabling Dura Soletanche Bachy to illustrate their engineering and innovation skills to full effect.

The dynamic compaction was complicated by the site topography, resulting in the work having to be carried out on platform benches at various levels along the valley sides. In addition, old river channels and flow paths existed within the soils. The dynamic compaction process was designed to homogenize the soil in order to control differential settlements.

A 150m long slurry cut-off was completed around the new plunge pool location, as well as for both the downstream and upstream coffer dams. For the relatively shallow coffer-dam slurry wall excavations, Dura Soletanche Bachy made use of their specialist long-arm backhoe excavator, which can be set up to reach a depth limit of up to 15m.

The backhoe excavation system was selected based on the geotechnical investigation which confirmed the existence of layers of loose boulders of very hard table mountain sandstone lying in the existing river bed channel. Alluvial boulders were excavated using the KS hydraulic grab.

Dura Soletanche Bachy started work at the project in August 2004 and works were completed in February 2005.

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