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Dynamic Sampling

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Dynamic Sampling Services

We investigate shallow ground conditions using an Archway Dart dynamic sampling rig. This is also known as Window Sampling (incorrectly*) and is an excellent technique for shallow investigation like traditional low-rise construction projects. The drill rig is lightweight and small diameter, meaning it is relatively low impact.

The rig can carry out SPT testing, dynamic probing, and undisturbed sampling. Good quality samples are recovered in plastic liners for logging and sub-sampling. The mast can be detached and operated up to 20m away; excellent for difficult access sites such as narrow alleyways or basements.

The main benefits of the technique are:

  • Good sample recovery for reliable logging & testing
  • Options for dynamic probing, SPT tests & UT70 sampling
  • Casing can be used on the upper 3m if ground is unstable
  • Less intrusive than trial pits
  • Accessible through gates & alleyways (rig width 600mm)
  • Tracking slopes up to 30 degrees

Downsides of the technique are:

  • Can refuse in dense ground or bedrock
  • Casing is restricted to 3m depth & will slow drilling speed
  • Max sampling diameter 100mm (will reduce with depth)
  • Occasionally sample recovery can be lost
  • Not accessible up/down long runs of steps or stairs
  • Ventilation is required in enclosed spaces

Things to consider are:

  • Headroom required is 3.10m minimum
  • Reinstatement and safety requirements
  • A starter pit is usually hand-dug at surface to check for services (approx. 0.3m square)
  • If there is concrete at surface, concrete coring or breaking will be needed

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Need An Expert Geotechnical Survey For Your Project?

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Need An Expert Geotechnical Survey For Your Project?

*When originally developed, the sample barrels were driven into the ground using a hydraulic breaker and had narrow slits down the side (called “windows”). The samples were gouged out manually by hand – very time consuming and very poor quality! As a result, the technique was developed to become “Windowless” meaning the sample barrels are lined with a plastic tube which contain the sample. The proper name is “Dynamic” sampling because the sample tubes are now driven in using a percussive hammer, not a breaker. We do still offer window and windowless sampling, but the dynamic sampling rig does the majority of the work!

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