Groundwater Protection During Excavation

Inground hydrocarbon contamination created risks to groundwater during Diaphragm Wall construction activities on the site. To manage the risk of drawing down contaminants during this activity, a cut off barrier formed from 2 circular walls of insitu stabilised soils around the shaft footprint were constructed using Cutter Soils Mixing technology.

In this way, the creation of potential preferential pathways in the chalk aquifer was minimised, waste arisings were greatly reduced and the material cementitiously stabilised.

The clever aspect of this work was the use of the cutter soil mixing to form a safe zone through which to telescope the  diaphragm wall shaft similar to the approach a Ground Investigation contractor would adopt if undertaken ‘clean drilling’ methods.

The cutter soil mixing wall installed provides a water cut off and prevents the migration of the contamination both in terms of the open diaphragm wall panels but also in terms of an impact on the curing of the concrete.

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Entry submitted by Costain Limited

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