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Re: Key Location in cant. retain. walls.[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Key Location in cant. retain. walls.
- From: Sleiman Serhal <mony(--nospam--at)destination.com.lb>
- Date: Fri, 24 Jul 1998 10:01:18 +0300
> > I prefer to have the key either in the middle or close to the toe. Not > near the heel, especially in the example listed with a 2:1 back slope. > The key at the heel requires more excavation, thus more expense. > > Roger Turk wrote: > > > > I prefer to have it at the middle, as close to under the wall as possible as > > reinforcing can be extended from the wall into the key and development > > lengths can be more easily accomodated. Also, there would be less concern > > (and need) for additional reinforcing to resist the tension and concentrated > > moment in the footing caused by the forces on the key. > > > > A. Roger Turk, P.E.(Structural) > > Tucson, Arizona > > > > rwhitsel wrote: > > > > . > In the design of cantilevered retaining walls, say with a 2:1 backfill, > > . > where is the "optimial" location of the key used to resist sliding of the > > . > wall, I have seen it placed in three places > > . > (1) at or near the Heel. > > . > (2) at or near the Toe. > > . > (3) somewhere inbetween perhaps near the stem to pick up some of the > > . > reinf. > > . > You should also take into consideration the fact that the key is most effective against sliding as far as possible from the toe. This increases the length of the slip surface so the cohesion of the natural bearing soil is used more. Moni Serhal
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