SINKHOLES
SINKHOLES
(OP)
In the US, what are the most common exploration methods for checking sinkhole potential? Exploration depth is within 10 meters below ground surface. I am in Japan and my local GPR contractor does not have the equipment to explore to that depth. What can be other options?
Thanks.
Thanks.





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Thaidavid
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Tried GPR, but did not get meaningful results.
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: SINKHOLES
Of course, regional geology, local observations and a review of landforms is always important!
f-d
ípapß gordo ainÆt no madre flaca!
RE: SINKHOLES
RE: SINKHOLES
www.mccoy.it
RE: SINKHOLES
RE: SINKHOLES
RE: SINKHOLES
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f-d
ípapß gordo ainÆt no madre flaca!
RE: SINKHOLES
RE: SINKHOLES
RE: SINKHOLES
RE: SINKHOLES
Okiryu - "SRE" is just the initials of my Engineering Tips user name.
We had sedimentary limestone with voids about 30' below the surface. There was much harder limestone (no voids) at a lower elevation. For the first generating unit on the site, we took our geotechnical consultant's recommendation and used drilled caissons that relied only on skin friction between the caisson and the hard limestone - no reliance on end bearing support. The assumption was a void could (theoretically) be located inches below the caisson tip. During construction we did encounter a lot of voids. A couple thousand point bearing timber piles were used elsewhere on the site where loads wee lower.
Ten years later, it was time to construct a second generating unit on the same site. This time, our geotech consultants (a different firm) recommended point bearing driven concrete piles. We had not had any failures of the existing point bearing timber piles. The recommended loading for the concrete piles was 50 tons. After discussions, I "covered our bets" and agreed to the point bearing concrete piles, but dropped the allowable loading from 50 tons to 40 tons.
Since I retired, two more units have been built on the site (for a total of four generating units) - using driven pile. No problems with any of the piling or caissons.
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RE: SINKHOLES
RE: SINKHOLES
www.SlideRuleEra.net
www.VacuumTubeEra.net