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Earthworks are engineering works created through the moving or processing of parts of the earth's surface involving quantities of soil or unformed rock. The earth may be moved to another location and formed into a desired shape for a purpose.:13.1
Earthworks typically involve machine excavation and fill or backfill.
Types of excavation
Excavation may be classified by type of material::13.1
- Topsoil excavation
- Earth excavation
- Rock excavation
- Muck excavation – this usually contains excess water and unsuitable soil
- Unclassified excavation – this is any combination of material types
Excavation may be classified by the purpose::13.1, 13.2
- Roadway excavation
- Drainage or structure excavation
- Bridge excavation
- Channel excavation
- Footing excavation
- Borrow excavation
- Dredge excavation
- Underground excavation
Civil engineering use
In military engineering, earthworks are, more specifically, types of fortifications constructed from soil. Although soil is not very strong, it is cheap enough that huge quantities can be used, generating formidable structures. Examples of older earthwork fortifications include moats, sod walls, motte-and-bailey castles, and hill forts. Modern examples include trenches and berms.
Heavy construction equipment is usually used due to the amounts of material to be moved — up to millions of cubic metres. Earthwork construction was revolutionised by the development of the (Fresno) scraper and other earth-moving machines such as the loader, production trucks, the grader, the bulldozer, the backhoe, and the dragline excavator.
Mass haul planning
Engineers need to concern themselves with issues of geotechnical engineering (such as soil density and strength) and with quantity estimation to ensure that soil volumes in the cuts match those of the fills, while minimizing the distance of movement. In the past, these calculations were done by hand using a slide rule and with methods such as Simpson's rule. Earthworks cost is a function of hauled amount x hauled distance. The goal of mass haul planning is to determine these amounts and the goal of mass haul optimization is to minimize either or both.
- Contour trenching
- Cut and fill
- Earth movers, construction/engineering vehicles used for earthworks civil engineering
- Earth structure
- Keyline design
- Land restoration
- Spoil tip
- Terrace (agriculture)
- Frederick S. Merritt, M. Kent Loftin, Jonathan T. Ricketts, Standard Handbook for Civil Engineers, Fourth Edition, McGraw-Hill Book Company, 1995.
- "Earthworks cost optimization through mass haul planning". www.topconplanning.com. Retrieved 7 June 2015.