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D-Walls in Water Charged Silty Sand
2

D-Walls in Water Charged Silty Sand

D-Walls in Water Charged Silty Sand

(OP)
Is there any experience out there in constructing diaphragm walls in silty sand with high groundwater levels.  I believe trench stability will be a problem.  Any comments?

RE: D-Walls in Water Charged Silty Sand

Dewater, dewater, dewater. Well points or a shallow well 16" and 10 feet below bottom of the wall.

RE: D-Walls in Water Charged Silty Sand

You must have the level of your drilling fluid ( bentonite mud or polymer mud ) at least 1.5 m above groundwater level to ensure stability of the excavation. This can be achieved with a backfilled working platform or surelaveted guide walls depending on what is practical. I would try to avoid dewatering as much as possible.

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