## Estimate of Drained Young's Modulus E' of Clay

## Estimate of Drained Young's Modulus E' of Clay

(OP)

Hi Guys,

Got a problem that has annoyed me for a while. I understand drained Young's Modulus E' of clay can be obtained from Oedometer consolidation test in the Lab; and there are also many published correlations between CPT qc, relative density and E' for SAND. However, I was wondering if there way to estimate E' of CLAY from CPT, SPT or other methods rather than laboratory testing? This is because we don't always have Oedometer or 1D consolidation test data for every single project...

Got a problem that has annoyed me for a while. I understand drained Young's Modulus E' of clay can be obtained from Oedometer consolidation test in the Lab; and there are also many published correlations between CPT qc, relative density and E' for SAND. However, I was wondering if there way to estimate E' of CLAY from CPT, SPT or other methods rather than laboratory testing? This is because we don't always have Oedometer or 1D consolidation test data for every single project...

## RE: Estimate of Drained Young's Modulus E' of Clay

f-d

¡papá gordo ain't no madre flaca!

## RE: Estimate of Drained Young's Modulus E' of Clay

E' = 1 / (450 N) m2/KN

= 1000 / 450N m2/MN.

Note that SPT N is uncorrected.

This is equation is after Stroud and Butler, 1975.

## RE: Estimate of Drained Young's Modulus E' of Clay

What I use:

Sanglerat 1972 is pretty much used in Europe for silty clays

Mayne et al. 1990 for the ECPT

## RE: Estimate of Drained Young's Modulus E' of Clay

Check here http://www.cpt-robertson.com/pub.html and download the latest 2009 paper. You may also find useful the CPT guide available from http://www.geologismiki.gr/Guides/Guides.html

Kindest regards

## RE: Estimate of Drained Young's Modulus E' of Clay

If you want to get more reliable results, oedometer test is neccesary.

## RE: Estimate of Drained Young's Modulus E' of Clay

## RE: Estimate of Drained Young's Modulus E' of Clay

## RE: Estimate of Drained Young's Modulus E' of Clay