Dynamic Probing

Published: June 17, 2020 | Last updated: July 5, 2023

What Does Dynamic Probing Mean?

Dynamic probing is an in-depth geotechnical site investigation method where the number of blows required to drive the cone to a depth of 100 mm is recorded. This method is similar to the standard penetration test (SPT.)

Dynamic probing provides a rapid and economic way to assess the penetration resistance of the ground and is roughly equated to SPT "N" values. It is capable of locating boundaries between strata of differing density and driving resistance.

The results can be used to identify voids, soft spots, or cavities in the soil.

Trenchlesspedia Explains Dynamic Probing

Dynamic probing utilizes a rod with a cone of a slightly larger diameter than the rod, fitted at its base. Using a constant mass and force dropped from a standard distance on the anvil at the top of the rod, the rod is driven into the ground. The number of blows required to drive the cone to 100 mm is recorded. This method helps determine the thickness and distribution of strata at different locations; since it is portable and easy to set up and operate. It however does not identify soil composition; neither can it retrieve soil samples.

Dynamic probing provides a continuous profile of ground resistance with depth. However, this test may yield unreliable results in soils containing cobbles and boulders. Also, the strata being tested using this method cannot be identified, and therefore it is recommended to use it along with other site investigation methods.

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