by M J Baldwin and D Gosling.
This paper was first published in GE’s June 2010 issue,
In last August’s edition of Ground Engineering, we discussed the implications of BS EN ISO 22475-1 for geotechnical sampling in the UK. In particular we examined methods used for obtaining class 1 quality samples suitable for strength and compressibility testing in the laboratory. While some existing sampling methods do comply - rotary core drilling and piston sampling - the traditional thick wall U100 driven open tube sampler does not.