CORRELATIONS BETWEEN CPT DATA AND SOIL CHARACTERISTICS OBTAINED FROM SPT

Abstract

Correlations of cone penetration resistance with physical properties of soil, SPT N-value and shear wave velocity are investigated where either the soil behaviour type index Ic proposed by Robertson, fines content or mean grain size is used as an index to specify soil types. The following conclusions are drawn: (1) The soil behaviour type index Ic shows good correlation with fines content and mean grain size. (2) The CPT-SPT resistance ratio (qt/N) varies not only with soil type but also with SPT N-value or CPT qt-value. (3) The shear wave velocity shows good correlation with the cone penetration resistance when soil behaviour type index Ic is taken into account.