Groundwater w 10 ft. head vs. 2 ft. 150 psi wet concrete

[antonibaloney]

It seems using basic principals of pressure that if I have a leak in a concrete form allowing groundwater with 10 feet of head behind it (excuse my layman wording)to seep in, that pouring (a wet) two foot thick slab into the form would fill the hole but never stop the intrusion of water.

We have a tunnel floor patch to do where we don't want to drill wells around the perimeter to intercept the ground water. If I try to push a two foot thick concrete pour ((150 lb./cf)(sqft/144sqin)(2ft)= 2.08 psi) against groundwater intruding ((62.4 lb/cuft)(10 ft of head)(sqft/144 sqin)= 4.3psi), it seems that though the concrete will resist the water, the water will still percolate up the sides while the concrete is wet and curing, and will continue to intrude.

We plan to use a water activated grout (De-neef foam) in the bottom corners injected through tubes from above after, but I am worried water will still sneak by because the water may snake some new path into the pour.

Any ideas or advice would be great. Thanks

 

[dicksewerrat]

Inject the grout first, all around the hole. you also could use some installed weep pipes. Place pipes around the patch area and connect them to a pump to remove more of the water. this should give you enogh time for the patch to cure. then cut and seal the pipes

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com