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Author:
Dr. Isa Mahmood Alburaim
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2000-09-26 |
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Dear sir,
I'd like to get some information about correlations between SPT 'N' value and classification of soils with respect of seismic hazard and potential of having liquefaction as a result of earthquake.
thanks
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Follow-up:
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Author:
Garland Likins
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2000-12-27 |
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One additional problem is that the SPT "N-value" is
affected by the energy transfer from the SPT hmmer
into the rod. This efficiency can be measured by for
example a Pile Driving Analyzer. The effect can be quite
substantial as efficiencies have been measured as low as
about 20% on some hammers and essentially 100% on others.
Thus if liquifaction is a concern, then SPT energy should
me measured and then the N value can be a more reliable
guide to liquifaction potential.
An ASTM procedure for liquifaction has been developed
which recognizes the importance of measuring this energy.
This specification is ASTM D-6066. It describes a rational
method to adjust the N values for differing hammer
efficiencies.
For an interesting case study for SPT and liquifaction,
you can look at:
www.ce.berkeley.edu/~sancio/turkey/adapazari/data/testing.html
editor shows above as clipped so in case, above ends like:
~sancio/turkey/adapazari/data/testing.html
(so make sure it ends in "html")
For further information on the above project look at:
www.eerc.berkeley.edu/turkey/adapazari/
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Return
to subject 'Geotechnical design and analysis'
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Follow-ups:
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Subject:
Liquefaction 