What is the second basic type of compaction force?

Vibratory force is recognized as a second basic type of compaction force due to its effectiveness in increasing soil density by utilizing dynamic forces. This type of compaction involves the use of equipment that generates vibrations, which facilitate the rearrangement of soil particles into denser configurations. When vibrations are applied to the soil, the particles move and settle into voids, significantly reducing air pockets and increasing overall density.

This method is particularly beneficial for granular soils, such as sand and gravel, because the vibratory action enhances particle interlock and compaction. It is also useful in layer compaction, allowing for efficient handling of larger areas and depths, which is critical in various construction and engineering applications.