Undisturbed
Tube Samples
An undisturbed sample, often obtained through techniques like cable percussion boring, is a soil sample that remains completely intact when extracted from beneath the ground surface. This method ensures minimal disruption to the sample's natural structure, water content, stress distribution, and density. Preserving these key attributes is essential for a comprehensive examination and analysis of the soil's behavior in its true subsurface environment.
How to Ship This Samples
Cohesive soils
If Cohesive soils (clayey or silty) are encountered, samples should be taken in nominal 3” diameter Shelby tubes or in a large diameter (6 inches) California sampler with brass liners (preferably no 1 inch rings samplers).
Important
For the analysis to be successful, do not extrude the sample from the Shelby tube.
Identification of Samples
Identify the samples with Project Name, Sample ID, Location, Bore Hole, Depth, Date samples taken, etc. The samples should be representative of the soil from the cable burial depth and above. Include a copy of the borehole logs.
If Bedrock is encountered
take core samples (minimum 2” diameter by 5” long) or block samples of about 5” cube of irregular shape.
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