Compaction density evaluation of Soil-Rock mixtures by the additive mass method

The use of highly-polydisperse soil-rock mixtures (S-RM) as the main filling materials in civil engineering is increasing. The rapid and accurate evaluation on the compaction densities of the S-RM is required during construction. In this study, the additive mass method (AMM) was adopted to evaluate the compaction densities of the S-RM composed of fresh dolomite and strongly weathered diorite porphyrite in an earth-rockfill dam under construction in China. The compaction densities evaluated by the AMM were compared with those measured by pit tests. The results demonstrated that for the S-RM containing low contents of diorite porphyrite, the compaction densities can be reasonably evaluated by the AMM. For the S-RM with high contents of diorite porphyrite, the analysis of thew -2 similar to Delta mcorrelation obtained by the AMM in advance is required to conduct reasonable compaction density evaluation.