Final answer:
Traditionally, fill compaction lifts should not exceed 12 inches, but new guidelines suggest up to 8 diameters side-to-side and 15 diameters deep, depending on material and equipment.
Step-by-step explanation:
In order to properly compact any fill, it has traditionally been recommended that it should be done in lifts no more than 12 inches deep. However, recent studies and practical experience in the field of engineering suggest that for effective compaction, the lifts could be as much as 8 diameters side-to-side and 15 diameters deep, depending on the type of material and compaction equipment being used. It is always essential to follow the project specifications and guidelines that are based on the engineering properties and compaction requirements of the material being used.
In order to compact any fill, it is generally recommended to do it in lifts no more than 15 diameters deep.
An older guideline suggested 5 side-to-side and 7-8 deep, but more recent research suggests as much as 8 diameters side-to-side and 15 diameters deep.
Compacting fill in layers helps ensure proper compaction and reduces the risk of settlement.