Answer: The water filled casing is lighter than grout backfill, so the uplift force acting on the bottom cap of the casing tends to push the casing out of the borehole. Read our technote on Countering casing buoyancy .
Answer: The water filled casing is lighter than grout backfill, so the uplift force acting on the bottom cap of the casing tends to push the casing out of the borehole. Read our technote on Countering casing buoyancy .
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