Cone Tip Resistance of Highly Compressible Jeju Beach Sand

This study is to evaluate the in-situ properties of Jeju sands, which are the beach sands derived from volcanic rock and shells, from the cone penetration tests on the specimens prepared in a calibration chamber. A unique characteristics of Jeju sand is relatively large extreme void ratios (emax=1.439, emin=1.026), which result in a large deformation during compression test. Test result shows that the cone resistance of Jeju sand is closely matched to that of predominantly quartz sand with high compressibility. It is also observed that the relative density and confining stress affects the constrained modulus less significantly than cone tip resistance, because of the crushing of calcareous materials contained in Jeju sand.