2018 Volume 74 Issue 2 Pages 202-212
Engineering behaviors such as soil compaction behaviors and strength-deformation properties after compaction of two types of gravelly soils that has similar grain size distribution and particle shapes were compared based on the results of a comprehensive series of laboratory tests. The parent rocks of the tested soils are sandstone and andesite, respectively. While the values of maximum dry density and optimum water content of those gravelly soils obtained from the compaction test using a rammer were similar, there was a large difference in roller compaction behavior and strength-deformation properties. One of main factor affecting the engineering behaviors of gravelly soils are the difference of the plasticity of the fine fractions. Because the parent rocks of the tested materials are respectively identical, difference of the plasticity of the fine fractions are derived from the characteristics of those parent rocks. The results obtained in this study indicate that, therefore, the characteristics of mother rock have influence on the engineering behaviors of gravelly soil even if the fine fraction content is low. When the value of plasticity index of the fine fraction becomes smaller, the compaction efficiency and strength-deformation characteristics of the gravelly soil were improved.
