Loss of Drilling Fluid Circulation
Loss of Drilling Fluid Circulation
(OP)
I have been asked to review a boring log to come up with some recommendations on the foundation type. The site is in Florida and the boring shows sand, then sandy clary, then stiff clay, then soft limestone.
The boring log notes loss of drilling fluid in each of the two clay layers. The upper layer of clay has 50% loss of drilling fluid circulation noted and the lower has 100% loss.
Would this make a drilled pier foundation not feasible? i.e. would we loose concrete as well?
The boring log notes loss of drilling fluid in each of the two clay layers. The upper layer of clay has 50% loss of drilling fluid circulation noted and the lower has 100% loss.
Would this make a drilled pier foundation not feasible? i.e. would we loose concrete as well?





RE: Loss of Drilling Fluid Circulation
RE: Loss of Drilling Fluid Circulation
I think you'd need a better understanding of exactly what occurred with the drilling & fluid loss to determine what happened. First, I'd question whether they were definitely using a drilling fluid during the soil sampling or whether they only starting fluid use to facilitate the rock coring. Also, it doesn't make sense to me that you'd lose fluid in a clay layer unless you encountered a void (sinkhole) that is forming in the material (in which case you should see rod drops, etc?). It would make sense that you could lose drilling water into the limestone during coring.
Foundation selection and considerations in limestone are difficult. Be careful.
RE: Loss of Drilling Fluid Circulation
enginerding, search for thread 256-195834. It deals with drilling, limestone, pinnacles, voids, and sink holes - all considerations for this thread.
RE: Loss of Drilling Fluid Circulation
Just an observation.
f-d
p.s., Any opportunity for drive piling?
¡papá gordo ain’t no madre flaca!
RE: Loss of Drilling Fluid Circulation