RQD and UCS?
RQD and UCS?
(OP)
ASTM D6032 is the standard for calculating RQD. RQD is measured on, "Sound core." ASTM describes sound core as any core that is fresh to moderately weathered and that has sufficient strength to resist hand breakage.
Separate and unrelated to RQD, FHWA claims any rock that has an UCS (unconfined compressive strength) less than 250 psi should be treated as, "Soil like" in its resistance to scour.
FHWA also claims that RQD>50 is considered resistant to scour.
Anybody think USC less than 250 psi is resistant to hand breakage?
f-d
Separate and unrelated to RQD, FHWA claims any rock that has an UCS (unconfined compressive strength) less than 250 psi should be treated as, "Soil like" in its resistance to scour.
FHWA also claims that RQD>50 is considered resistant to scour.
Anybody think USC less than 250 psi is resistant to hand breakage?
f-d
ípapß gordo ainÆt no madre flaca!





RE: RQD and UCS?
RE: RQD and UCS?
Another thought is that hand breakage and scour potential are not as closely related as they would like to believe. I would see a higher limit for scour potential and a lower limit for hand breakage threshold.
RE: RQD and UCS?
RE: RQD and UCS?
f-d
ípapß gordo ainÆt no madre flaca!