Use of the SPT test in clayey soils


The SPT test is to be avoided within the clayey soils under a water table. A possible explanation of this warning is that most of the driving energy of sampler is absorbed by the water table which leads to a higher number of blow counts. Is it correct to use the number of blow counted within a clayey material saturated by capillarity ? 

Soil Mechanics / Geotechnical Geotechnical Investigations & In-Situ Testing Analysis

Asked 29/07/2013 19:36, updated: 14/03/2017 14:08
Ali Bouafia

2 Answers

Votes: 1

Falko Schmidt

This is a tricky question: the common recomendations and correlations are for non-cohesive soil. however there are authors saying there is no problem using SPT: http://arsghahramani.com/sm12b.pdf

Whenever possible use CPT-U for this type of soil.


Votes: 1

Ali Bouafia

Dear Sir,

   Thank you very much for your answer and the document you provided me with. 

Regards.

 

Ali