STUDY ON APPLICATION OF SAMPLING AND CONE PENETRATION TEST TO SANDY GROUND

Abstract

 Sampling and Cone Penetration Test (S&CPT), which enables simultaneous sounding and sampling, was proposed as a simple and economical ground investigation method in seafloor. To improve penetration performance, sampling performance, and workability, the structure of samplers was improved, and field experiment was conducted on sandy ground. As a result, we succeeded in collecting several meters of slightly disturbed continuous soil samples from sandy ground with N values as high as 20. The working time required for penetration and withdrawal of the sampler and probe was about two times longer than that of the cone penetration test (CPT). Thus, the workability od S&CPT was much higher than the standard penetration test (SPT) and/or the undisturbed sampling by sophisticated drilling.