2010/07/01 by Michael Long, Shane Donohue
Engineering · #Geotechnical Engineering and Soil Mechanics #Geotechnical Engineering and Underground Structures #Geotechnical Engineering and Soil Stabilization
paper · doi:10.1139/t09-133
A database of research-quality piezocone cone penetration test (CPTU) and shear wave velocity, V s , information for Norwegian marine clays has been assembled to study the small-strain stiffness relationships for these materials and to examine the potential use of CPTU and V s data in combination for the purposes of characterizing these soils. Data for sites where high-quality block sampling was carried out have mostly been used. Improvements have been suggested to existing correlations between the small-strain shear modulus, G max , or V s and index properties for these soils. Recent research has shown that CPTU corrected cone tip resistance, q t , and especially the pore pressure measured during CPTUs, u 2 , and V s can be measured reliably and repeatably and are not operator or equipment dependant. Therefore, a new soil classification chart involving the normalized cone resistance, Q t , and normalized shear wave velocity, V s1 , or V s1 and Δu/[Formula: see text] (where u is the pore-water pressure and [Formula: see text] is the in situ vertical effective stress) is presented. Using this chart it is possible to clearly distinguish between clays of different overconsolidation ratios (OCRs).