Characterisation of Norwegian marine clays with combined shear wave velocity and piezocone cone penetration test (CPTU) data

摘要

A database of research quality CPTU and shear wave velocityinformation for Norwegian marine clays has been assembled so as to study the smallstrain stiffness relationships for these materials and to examine the potential use ofCPTU and Vs data in combination for the purposes of characterising these soils. Datafor sites where high quality block sampling was carried out have mostly been used.Improvements have been suggested to existing correlations between Gmax or Vs andindex properties for these soils. Recent research has shown that CPTU qt andespecially u2 and Vs can be measured reliably and repeatably and are not operator orequipment dependant. Therefore a new soil classification chart involving Qt andnormalised shear wave velocity (Vs1) or Vs1 and Δu/σv0u27 is presented. Using this chartit is possible to clearly distinguish between clays of different OCR.