The remaining surface after removing unsuitable material is classified as which soil group?

The remaining surface after removing unsuitable material is classified as which soil group?

• A. A-1-3 Soil Groups
• B. B-2-3 Soil Groups
• C. C-4 Soil Groups
• D. A-2-7 Soil Groups

Answer: (D)

In earthwork practice, after removing unsuitable material, the remaining surface is categorized by a soil group that reflects how the material behaves under loading, especially its ability to be compacted to a stable, well-drained subgrade. The best-fit group is the one that represents a soil with a balanced mix that can be compacted reliably to the required density and will provide adequate bearing capacity and drainage without excessive swelling or instability. So the remaining surface is classified as the group described by those favorable, workable properties. (Other groups describe soils that are too plastic, too coarse, or have poor drainage and would not be suitable for the finished surface.)

In earthwork practice, after removing unsuitable material, the remaining surface is categorized by a soil group that reflects how the material behaves under loading, especially its ability to be compacted to a stable, well-drained subgrade. The best-fit group is the one that represents a soil with a balanced mix that can be compacted reliably to the required density and will provide adequate bearing capacity and drainage without excessive swelling or instability. So the remaining surface is classified as the group described by those favorable, workable properties. (Other groups describe soils that are too plastic, too coarse, or have poor drainage and would not be suitable for the finished surface.)