Cone penetrometer testing to assess liquefaction risk: how good is the ground we're on?


Since the earthquakes in Christchurch in 2011, and Kaikoura five years later, liquefaction has caused severe damage to ground and buildings.

Many councils have updated building consents to ensure regions are better prepared for future earthquake liquefaction. 


CPT, or Cone Penetrometer Testing, is a method used to determine soil properties by the resistance encountered when a probe is pushed into the ground. Seismic CPT (SCPT) is used to measure shear wave velocities as well.

Test results reveal soil strength, pore-water pressure and of particular interest: the potential for liquefaction during an earthquake.

RDCL preforms CPT tests across Hawke's Bay and the North Island for projects both large and small - from residential building consents to large-scale subdivisions, and property development, including the extension to Hawke's Bay Airport and offshore Opotiki.