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Retaining Wall at Retention Pond
2

Retaining Wall at Retention Pond

Retaining Wall at Retention Pond

(OP)
Could you please provide some tips for design of retaining wall at retention pond?  Here are some that i know i should be aware of:
1. buoyency which causes reduction sliding resistance
2. check for:
  1. when pond is full of water
  2. when pond is empty - worst condition
3. saturation causes reduction in bearing pressure.

I would really appreciate it if you could share some of your experience and advices with me.

thank you all.

RE: Retaining Wall at Retention Pond

You may wish to consider the effect of vehicle loading behind the wall from maintenance or other vehicles such as cranes that may at some time be used to lift in heavy equipment.

RE: Retaining Wall at Retention Pond

I'd also design for a case of water in the pond and no soil is behind the wall.  While it's conservative, you never know when someone is going to excavate next to the wall.

RE: Retaining Wall at Retention Pond

i would suggest you always design as if soil is not present in the full case. since 1) backfill may not be adequate 2) erosion could take place 3) soil would need to 'deflect' before passive resistance is started.

RE: Retaining Wall at Retention Pond

Also check the rapid drawdown case - pond is drained and backfill is still saturated.  This is often the worst case.

RE: Retaining Wall at Retention Pond

If the water is against the retaining wall without a liner, then you may want to design it as a liquid containment vessel per ACI 350 to control cracking.

RE: Retaining Wall at Retention Pond

Another reason you may want to design for no soil is that the Owner may want to hydrostatically test the adequacy of the water containment wall before backfilling so that any leaks could observed and patched beforehand.

RE: Retaining Wall at Retention Pond

(OP)
Thanks for all of your valuable input, I am really glad that we are helping each other in this industry and that most engineers are generous to share their experiences.

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