Why is it easier to achieve good compaction on a large fill area compared to a small fill area?

Achieving good compaction on a large fill area is indeed easier primarily due to the beneficial effects of hauling equipment on the fill itself. When equipment passes over the fill material, it exerts significant weight and vibration, which helps to consolidate the soil particles and eliminate air voids, leading to a denser compaction.

In larger areas, this process can be continuous and more effective because the movement of heavy machinery can be more dispersed and systematic across the expanse, ensuring that the entire area is uniformly compacted. The sheer size of the area also allows for more flexible equipment movement patterns that can optimize compaction efforts.

While other factors like space for equipment, distance for material transport, and moisture control play roles in the overall process, they do not directly influence the efficiency of compaction as significantly as the physical weight and operation of the equipment itself do. The utilization of heavy equipment helps manage and manipulate the soil more thoroughly, which is crucial in achieving the desired density over larger fill areas.