PE Civil Transportation Practice Exam

Dynamic compaction is primarily effective for granular soil deposits due to their inherent characteristics. Granular soils, which include sands and gravels, are composed of larger particles that allow for greater movement and rearrangement when subjected to dynamic loading. This method employs heavy weights dropped from a significant height to impart energy into the soil, effectively rearranging the soil particles into a denser configuration.

The effectiveness of dynamic compaction stems from the ability of granular soils to respond to vibration and stress, which improves their density and stability. This is particularly important in construction projects where a stable foundation is crucial.

In contrast, silty and clayey soils typically have finer particles and higher plasticity. They do not respond to compaction in the same manner due to cohesion and the potential for water retention, which can lead to less effective densification results. While dynamic compaction can have some effect on these types of soils, it is not as efficient compared to granular deposits, making the latter the primary type suited for this compaction technique.