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RE: "Hydrovac" for pier construction

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From: Padmanabhan Rajendran [mailto:rakamaka(--nospam--at)]
Sent: Wednesday, May 24, 2006 7:46 AM
To: seaint(--nospam--at)
Subject: Re: "Hydrovac" for pier construction



It appears that you have designed hydrovac constructed piers. Do you have any insight in to the formulas for determining vertical and lateral load capacities of such piers. Intuitively, these piers should have lower capacities than traditionally drilled peirs.


I don’t necessarily accept your premise. In each case, you’re boring a hole in the earth, and then filling that hole with concrete.


Both methods “disturb” the surrounding soils. In fact, very often drilling fluids are used in boring holes using an augur. Underreaming also does its share of disturbing the soil.


Why do you think that hydrovaccing would give “lower capacities” than boring?