I too am unaware of any standard practice for evaluating SPT blow counts in gravel soils. Whenever I have encountered such soils, I look at all three six inch intervals of the SPT test. If the blow counts were 5-5-25, I would likely use an N-count of 10 rather than 30. Also, a comparison of...
I happen to have the same two texts, and the only differencee in the equations is in the definition of terms. What Das defines as swelling index on p40 is the same as what Cudoto defines as recompression index on p71. Both terms refer to the slope of the unloading portion of the consolidation...
Thanks again for your comments.
I was provided the previous data of work performed by others for review after the compacted fill at the project site was found to be too soft at time of footing construction. I do not have access to the Proctor lab data and further testing is not a option at...
Thank you all for your comments. I do not have access to the lab Proctor data or specific gravity information.
Other information which is relevant is that the soils are residual soils on Triassic Basin sedimentary units of NC which are known to be moderately expansive. I suspect that oven...
In the course of a forensic investigation of failed residential foundations in compacted fill, I was provided with the following test data by a geotech firm:
LL = 36%
PI = 17%
USCS = CL
Standard Proctor Tests:
MDD = 127.2 pcf OMC = 12.8%
MDD = 121.0 pcf OMC = 15.8%
MDD = 107.5 pcf OMC =...
There is a practice among geotechnical engineers in my area that is locally called an “engineered footing.” This practice is used mainly in residential foundation construction where weak soils are encountered at the bottom-of-footing elevation and a firm bearing layer underlies the weak soils...
