Design and Construction if Diaphragm Wall 1

[Scottie25]

Would anyone please be able to provide me with information on the design and construction of Diaphragm Walls?
Going to be constructed at a coastal location approximately 15m high embedded into rock and a column of building coming down on its top.

 

[MiketheEngineer]

Need a WHOLE lot more of info!!

Generally - its plywood on one or both sides. See IBC 2009

 

[hokie66]

Mike,
Agree that more information is needed, but I don't think his type of diaphragm wall involves plywood. Rather, in simple terms, I think it is a trench reinforced and filled with concrete. Is that right, Scottie?

 

[Scottie25]

Sorry gentlemen, Tried to keep it concise and general. Here's a bit more info.
Going to be reclaiming land (Crushed, graded and cleaned gravel demolition waste).
Going to construct diaphragm wall in reclaimed land, maximum depth to bedrock from surface of land reclaim is 20m.
Then excavate reclaimed land on river side of wall, therefore leaving vertical concrete diaphragm wall.
Bedrock is mostly couple metres of weathered andesite on top of intact andesite. Some glacial deposits and both cohesive and granular alluvium on top of bedrock, again only a few metres.
Maximum tidal height is at 3.4m OD.
Landfill height at 6m OD.
Bedrock at -13m OD.

Mike, I was looking along what you are saying. Excavating down into bedrock, in with reinforcement and concrete to displace slurry.
Not to sure on exact values of demolition infill but going to treat as a gravel with general values until then.
A bit unsure of where to start on the whole design calcs, been trying to find some worked exmaples for a similar situation.
Also got a column of a building coming down on to the diaphragm wall, with a preliminary load of 500 kN.
Thanks, really appreciate the help.

 

[PEinc]

Robert T. Ratay's newly published Temporary Structures in Construction, Third Edition, Chapter 8, has 50 pages on Diaphragm/Slurry Walls, written by the President of Bencor Corporation of America, Inc.

http://www.PeirceEngineering.com

 

[msquared48]

Mike uses rockwood, so his suggestion is OK...

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[Scottie25]

Cheers peonc, i will have a look. And sorry, in the abve post i meant to say i agreed with hokie66 suggestion.

 

[hokie66]

It may depend on your location, but diaphragm walls are normally considered specialty work performed by piling contractors. It sounds like your wall will need permanent ground anchors into the reclaimed land, so that will require some fairly sophisticated geotechnical advice. Before proceeding too much farther, I think you need to assemble a team including a geotechnical consultant and contractor who are both experienced in this type work.

 

[MiketheEngineer]

I have a "rock" head but generaly agree with H66. Get together....

 

[msquared48]

Rock on Mike...

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com