Influence of compaction history on the shear strength behaviour of compacted soil
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The condition under which soil is compacted governs its shear strength, which is why the shear strength parameters of specimens compacted at a given state are usually evaluated and tested for different post-compaction loading conditions. While this enables the behaviour to be predicted in service, the impact of the compaction history is usually ignored. This is an important aspect because how compacted soil behaves during shearing is strongly influenced by its structure and suction, and thus its compaction and loading history. In this paper the aspects related to the compaction history of a silty sand soil prepared by dynamic compaction and then tested with a direct shearing box are examined. To replicate an as-compacted condition, the specimens are tested under constant water content. To investigate the compaction history the specimens were prepared under different levels of compaction energy and then tested under the same vertical stress. The results confirm how important the initial stress state of the soil is in relation to its compaction history, in governing the mechanical response during direct shearing.