Pour concrete on high ground water level location 1

[ray81]

Can anyone give me a suggestions, if i want to pour 32MPa concrete on high ground water level on the ground, what should i do, besides i put the liner inside the ground? Any other easy idea that we can make it or not?

Any suggestions will be appreaciate, thank you.


Ray

 

[SlideRuleEra]

A liner is not usually needed and could do more harm than good by trapping any excess water in the concrete mix.

Over-excavate and place good granular material, such as crushed stone, in the bottom of the excavation so that the concrete will not be placed on "mud".

Leave the top of this stone 3 inches lower than specified to compensate or the likely hood that the first concrete placed in the excavation will be contaminated by soil.

Keep the excavation pumped out with diaphragm pumps (mud-hogs) before and during concrete placement.

After the concrete has been placed, discontinue pumping and cure the concrete as usual.

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[ray81]

Thanks for your suggestion. By the way, As you mentioned about put good granular material at the bottom of the completion of excavation, how about if the ground is sandy ground with high ground water level with deep excavation?

 

[SlideRuleEra]

ray81 - If pumps can't handle the inflow, you may have to use a vacuum well point system. Before going to that, however, it may be worth digging a test pit to the required depth and seeing if pumps will do the job.

Many times, even if the water table is high and the soil is sandy, the steady state inflow of groundwater into an excavation is manageable with pumps alone.

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[LCruiser]

SlideRuleEra is correct, it may be manageable with pumps alone. What kind of flow are you getting when you pump it down? You can use perforated drainage pipe around the exterior, to a well. How deep is it? If it's too deep for a suction pump you might want to get a submersible. You can dig a hole in the bottom with a backhoe (bailing every other dip or so) and insert a perforated cmp and backfill around it with clean rock to put the pump (or suction hose) into.

It depends on what you're going to build there as well.