Bearing capacity from Rock properties
Bearing capacity from Rock properties
(OP)
Guys:
Is there anyway we can estimate Bearing capacity from Rock properties (RQD/ UCS of rock cores) ? Is there any correlation. We have rock with low RQD (<50) at footing depth. Is there any charts available.
Thanks
Naga
Is there anyway we can estimate Bearing capacity from Rock properties (RQD/ UCS of rock cores) ? Is there any correlation. We have rock with low RQD (<50) at footing depth. Is there any charts available.
Thanks
Naga





RE: Bearing capacity from Rock properties
Under similar circumstance I usually call for an extended additional investigation with numerous quarry drill holes looking for the better and worst zones, depending on the structure involved. Then I decide on the competency of the support.
RE: Bearing capacity from Rock properties
Shallow cavities may be revealed by Electrical tomography though.
What I usually do in your situation is to apply the known Hoek & Brown method
Hoek et al.: “Hoek-Brown failure criterion – edition 2002”
with a procedure for very poor rocks described in this article (involves observation of drilled cores):
Osgoui, Ulusay, Unal: “An assistant tool for the geological strenght index to better characterize poor and very poor rock masses”, International Journal of Rock Mechanics and Mining Sciences, 47 (2010) 690-697.
RE: Bearing capacity from Rock properties
Now determining your rock-mass properties is the problem. . .
f-d
¡papá gordo ain’t no madre flaca!
RE: Bearing capacity from Rock properties
DEPARTMENT OF THE ARMY EM 1110-1-2908
U.S. Army Corps of Engineers
CECW-EG Washington, DC 20314-1000
Manual
No. 1110-1-2908 30 November 1994
Engineering and Design
ROCK FOUNDATIONS
RE: Bearing capacity from Rock properties