U trough retaining wall

[Geosubhtech]

Hello,

I want some reference(standard) for the u trough retaining wall. This is actually a abutment type of structure which will be back filled. This will serve the approach for the rail lines from embankment to bridge. It's 1200 meters long.

SO, i want any guidelines for foundation recommendation, in terms of allowable settlement and bearing capacity checking.

Thank you.

 

[BridgeSmith]

The allowable settlement will be governed by the tolerable settlement, which is a function of the configuration of the structure and the type of connections between the wall and the backfill. Will it have a full footing between the walls? If not, then the tolerable settlement depends on the type of tiebacks for the wall facing. To get more specific answers, you will need to provide more specific information for the structure.

 

[oldestguy]

Provide a cross section and we can comment. Sounds like a gravity wall.

 

[Geosubhtech]

Sir,

Please see the attachment.

 

[EireChch]

Shub_123,

What is located either side of the walls? Is it a free standing structure? Is the base to site at ground level, or are you planning to partially burry? You will likely need to bury to obtain sufficient bearing capacity. The deeper it is the higher bearing capacity. Obviously an economical limit.

The sketch doesnt seem to be to scale either? What is the depth of the backfill?

 

[Geosubhtech]

The Wall height is 8m to 9m according to the gradient to be maintained (as this is the approach to the bridge from embankments). It's a elevated corridor.
The depth of foundation is kept minimum of 2m. Burring more than 3m will not be economical because its B X L is 9m X 1230 m.

 

[oldestguy]

Was not this subject in another post (duplicate)? In any case, any settlement can be adjusted in the track ties to meet the bridge elevations. If these are predicted to be excessive, the trough can be supported on piling or other deep foundation.

 

[Geosubhtech]

I want to know any Standard allowable limits are there or not, which is suiting my case.

 

[oldestguy]

Asa to standards, I'd check with the railroad as to re-leveling the tracks at the junction to the bridge. Some RR construction engineers are very fussy.

 

[EireChch]

Agree with OG, you will get good guesses of what the allowable limit it but it should only be based on the relevant code discussion with the local approving authority.

Also, it seems crazy to me to construct 8-9m height of backfill. Is piling and piers not cheaper? Utilise precast concrete for quicker construction etc.

 

[Geosubhtech]

I checked the height is min 3 to max 4 m. I think it's reasonable according to stability of slopes.
By the way thank you for your views.