Results are presented comparing various sizes and configurations of piezocones in UK clays. Most correlations with geotechnical data were developed based on 10cm~2CPT and CPTU results, but little has been reported on the effects of size of device, both diameter and area of friction sleeve, on the measured results. It is shown that for commercially available 10 and 15 cm~2 equipment: measured cone resistance is a function of individual cone geometry but cone resistance corrected for pore pressure effects is unaffected by cone size, measured sleeve friction would appear to be very similar for most of the cones although some differences noted. Cones with reduced sensitivity can be affected by electrical noise in soft deposits. The new accuracy classes of the IRTP 1999 are considered.
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