undisturbed samples
undisturbed samples
(OP)
I was told that core recovered from boreholes using double barrel cores are not suitable for triaxial testing as they are disturbed and as a result usually request "undisturbed" tube samples for this type of testing. Does anyone know if double barrel borehole cores can actually be used for triaxial testing?





RE: undisturbed samples
I know that this is not a direct answer, but I wouldn't think there's any yes or no answer possible - heck, the driller is the largest factor!
f-d
¡papá gordo ain’t no madre flaca!
RE: undisturbed samples
Soil would be very iffy, depending on the type of soil.
Rock, unless it is very soft or has a tendency to swell when pressure is released (like some shales), should be just fine.
RE: undisturbed samples
Material Type & Consistency
Sampling method
Drilling and Sampling personnel experience & care
Laboratory storage & preparation personnel experience & care
Laboratory testing personnel experience & care
Final consideration of results
The direct answer to your question is - possibly, the samples would be suitable for triaxial testing.
Slightly off topic.
ASTM will soon be consistently using the term 'intact samples' rather than 'undisturbed samples' which may be a step forward in discussions such as this.
RE: undisturbed samples
tidykiwi;
Also include the diameter of the sample as well. Bureau of Reclamation used 6-inch diameter Pitcher and Dension samplers - even so, samples were radiographed to attempt to reduce the effort in selecting "undisturbed" samples from which test specimens were then trimmed.
All said, this level of effort is well beyond what occurs in most sampling and testing regimens, and fattdad's, GeoPaveTraffic's and emmjgld's considerations are what ultimately determines the value of the test results.
prior to selecting sections for testing.One can check for sample disturbance using radiographs.