Study on compaction test method using small size apparatus based on allowable maximum grain size

摘要

The strength of soil depends on the degree of compaction. Therefore, it is essential to investigate the degree of compaction of soil structure to evaluate its soundness. Compaction test has been widely used to investigate degree of compaction of the present embankment and compaction characteristics of ground material. This study aims to verify the applicability of the new compaction test method using a small size compaction test apparatus. In this paper, a series of small compaction tests using 5 cm diameter mold and 1.5kg rammer was performed to examine the effect of the maximum grain size and its content of soil samples on the compaction properties in the small mold. As a result, maximum grain size of soil sample within 9.5mm, compaction curves obtained from 5cm mold are approximately matched with compaction curves of 10cm mold. It was found that the allowable maximum grain size in 5 cm diameter mold is 9.5 mm. In addition, applicability of existing equation for estimating the compacted density of granular soils with oversize particles were evaluated.