To obtain a more accurate evaluation of strength, of coral gravel soil, engineering properties of that material were compared to soils of another group. Samples taken near coral reefs contain more gravel than those soils, and N values for coral gravel soil are lower due to less sand content. Results of biaxial UU-tests show some larger angles of internal friction in the samples of another group compared to zero degrees of angle in common clay soils using the same test. Results of triaxial CD-tests seem more credible than those of UU-tests in evaluating shear strength of coral gravel soil since this material is considered adequate as an intermediate soil. Triaxial CD-tests further demonstrate that coral gravel soil could be affected by the cementation effect.
