Abstract
A new small diameter sampler with two chamber hydraulic pistons (45 sampler) was developed. An outline of the 45 sampler is shown, and its applicability is also investigated through the unconfined compression tests for the holocene and the pleistocene clay deposits in Mito city in Japan. The undrained shear strength for the samples obtained from the 45 sampler are larger than that of the stationary piston sampler (75 samler) used by the Japanese Geotechnical Society.
