What is the correct sequence of soil preparation before filling?

The selected sequence emphasizes a crucial aspect of soil preparation prior to filling, which involves both the removal of topsoil and vegetation. This step is vital because it ensures that any organic material and excess moisture are eliminated, leading to a stable foundation for the fill material.

Removing vegetation is essential, as roots can decay over time and cause voids or subsidence in the fill. Similarly, the removal of topsoil is important because it often contains organic matter that can decompose, leading to instability in the fill site. Once these materials are removed, it enhances the anchoring of the fill to the subgrade, thus improving the overall integrity and longevity of the filled area.

After the removal steps, placing the fill material properly is necessary to achieve the desired grade and ensure that the load-bearing capacity is attained. Compaction follows once the fill material is in place, effectively densifying the fill to minimize future settlement and provide a solid base for construction.

Ultimately, this sequence supports successful soil preparation practices in construction projects, leading to better load distribution and reduced potential for future displacement.