Retaining wall over obstructions
Retaining wall over obstructions
(OP)
Hi i am working on a project and i need some advice on the choice of retaining wall
I have a site that has a old victorian pipe 12m below ground level and that is 4m wide. I need to design a retaining structure over this pipe. The soil is london clay with the water level 4m below ground level.
I cant diverty the pipe because it is rather old and made of cast iron.
I have ruled out using king piles because the water table is rather high.
Any suggestions on what retaining structure i can use without disrupting the old pipe??
I have a site that has a old victorian pipe 12m below ground level and that is 4m wide. I need to design a retaining structure over this pipe. The soil is london clay with the water level 4m below ground level.
I cant diverty the pipe because it is rather old and made of cast iron.
I have ruled out using king piles because the water table is rather high.
Any suggestions on what retaining structure i can use without disrupting the old pipe??





RE: Retaining wall over obstructions
Also, is there existing soil on the upslope side of the wall (so there will be little new surcharge. e.g. are you replacing an existing 2H:1V slope with a wall), will the wall retain new fill, or retain new cut.
For a pipe that's been there 100 - 150 years and 12 m depth, I'd be much more concerned with the overall stress change due to fill or cut than the small stress bulb created by the footing itself. As long as there's such a thick cushion of soil over the pipe, I imagine an additional stresses will be arched around the pipe due to the 100 - 150 year-old compaction effort (assumed to be low). This backfill could however result in added settlement of the wall and fill over the pipe.
Can't say more than that until I know more...
RE: Retaining wall over obstructions
I have used this on a few jobs.
Check this paper out.
http://pubsindex.trb.org/view.aspx?id=801079
After this slab is built, you probably can use an ordinary retaining wall which rests on earth.
RE: Retaining wall over obstructions
See this thread: 158-259207
And do a search for "Imperfect trench"
RE: Retaining wall over obstructions
I have never heard the term "King Pile".
What do you mean by this?
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Retaining wall over obstructions
msquared48:
King pile is also known as soldier pile or various other names.. Its installing steel or wooden I beams and putting planks between the beams.
RE: Retaining wall over obstructions
Any reason why Augercast pile to either side of the 13 foot wide pipe would not work - drilled as opposed to driven as driving pile could damage the old pipe?
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Retaining wall over obstructions
If i were to use an auger are u suggesting to create a secant pile wall?? How can i maintain continuity for the wall over when passing over the pipe?
Can i create a secant pile wall by example driving 12m piles all around the site but when i reach the pipe i drive 10m piles. Can this work?
RE: Retaining wall over obstructions
The main design problem I can see here would be the differential deflection between the piled and non-piled portions of the retaining wall.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Retaining wall over obstructions
RE: Retaining wall over obstructions
RE: Retaining wall over obstructions
Are you actually adding any additional load to this pipe 12m down?
If the soil is already at a similar height to the top of the wall then the answer is probably no.