SELECT VisCPT VIDEO CLIPS FROM
TREASURE ISLAND

            In each of the video clips below, the VisCPT is advanced in several 5 cm increments.  A short pause between advances allows for observation of soil movement during  excess pore water pressure dissipation.   Such movement occur only in relatively loose cohesionless soils.  Thus, the movements can be related to a soils' susceptibility to liquefaction.

Two types of motion are observed:
   1) Piping of fines through the pore channels of a coarser soil skeleton,
   2) Mass movement of loose relatively uniform soil.

Click on each still image to watch a short video clip
(an ".mpg" file player is needed).

  UM26-1  soil piping - note the stationary coarse particles

  UM26a-2 soil piping - very dramatic, clearly a loose soil

  UM26b-1 mass movement - short duration

  UM25-2   mass movement (after last advance only) 

  UM25a-1 mass movement (unusual horizontal flow)

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