What material can be used anywhere in the embankment?

• A. Select (A-3, A-4)
• B. Granular borrow
• C. Clay fill
• D. Topsoil

Answer: (A)

The material being described as suitable for use anywhere in the embankment is select fill. This type of material is chosen because it has a well‑graded, granular makeup with low organic content and good compaction characteristics, which gives reliable bearing capacity and stable density throughout the entire embankment, from toe to crest. It also drains well enough to prevent excess pore pressures during construction and service.

Granular borrow can be used in many places, but its gradation and fines content can vary, making its performance less uniform across the whole embankment. Clay fill tends to swell and shrink with moisture changes and can trap moisture, leading to instability and poor drainage. Topsoil, while great for surface cover and vegetation, doesn’t provide the necessary stiffness and load-bearing capacity for structural fill.