Applicability of a two-chamber hydraulic piston sampler for hard soil deposits

Abstract

The applicability of the 45-mm and 50-mm samplers is examined for highly organic, clayey and sandy samples obtained from Holocene and Pleistocene tertiary clays and Holocene sand deposits at 41 sites including some abroad. It is confirmed that the 45-mm sampler can take high-quality samples just as well as rotary double-tube (JGS 1222-2012) and rotary triple-tube (JGS 1223-2012) samplers for soils having an unconfined compressive strength of q_u=8~1415 kN/m² and SPT N-values of 3~54. Therefore, the 45-mm sampler can be applied as a sampler of JGS 1221, JGS 1222 and JGS 1223 to recover undisturbed soil samples suitable for laboratory tests.