Segmental Retaining Wall with Zero Batter 1

[jagti]

Our Client a developer requires a retaining wall at a site where the grading height of the wall is about 7.5m (24ft) typically i have seen Segmental Retaining walls with a batter (a setback)in this case the setback causes about approx 1.0m(3.0 ft) of costly real estate land being sacrificed. My question is there a possibility of building these walls completely vertical almost 7.5m high using geogrid reinforcement.

The first thought i get is these walls being classified as flexible structure the blocks will shift relative to vertical plane as we compact the reinforced fill i am concerned if it would create a lean in opposite side when active earth pressure fully mobilized. Also, my other worry is differential settlement.

Thanks for suggestions.

 

[RFreund]

There are wall systems that can stack vertically however you are correct with your concern in that they may start to lean outward because of there flexibly. You may be able to find a block that has less batter though and may be able to cut the 3' down to 1.5'. I would have to double check that though as I can't remember a specific system off the top of my head.

EIT

 

[concretemasonry]

Any one of the 4 large SRW developers/licens0rs probably has a series of tests to back up what they claim for a "zero batter" wall. Instead of the likely supplier (look out for unjustified "knock-off" systems), go the the most likely reputable supplier and get the number to call for technical support.

You probably will be using a flexible fabric periodically, so the backfill will progress with the wall construction.

The 24' height does not seem impossible for a good unbattered system, but it may be more costly than a bettered system. For much higher walls there is a good record and engineering justification, although much of it is in many countries where the products are produced.

SRWs are a flexible system/structure.

Engineer and international traveler interested in construction techniques, problems and proper design.

 

[Nuccio]

There are some SRW block that only moves a 1/4" per course (8") so on a 24' wall that is only 9" total

 

[concretemasonry]

Just make sure the company with the claims can support them with tests or signed calculations, approvals. Any of the recognized international developers should have proof of the claims.

Dick

Engineer and international traveler interested in construction techniques, problems and proper design.

 

[PEinc]

My quick impression is that this developer may be unreasonable. Be careful dealing with an unreasonable developer.

http://www.PeirceEngineering.com