Earthworks (engineering)
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Earthworks are engineering works created through the processing of parts of the earth's surface involving quantities of soil or unformed rock.
Shoring structures
[edit | edit source]An incomplete list of possible temporary or permanent geotechnical shoring structures that may be designed and utilised as part of earthworks:
Gallery
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Retaining wall types
Excavation
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Excavation may be classified by type of material:[1]: 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:[1]: 13.1, 13.2
Civil engineering use
[edit | edit source]Typical earthworks include road construction, railway beds, causeways, dams, levees, canals, and berms. Other common earthworks are land grading to reconfigure the topography of a site, or to stabilize slopes.
Military use
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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.
Equipment
[edit | edit source]Heavy construction equipment is usually used due to the amounts of material to be moved — up to millions of cubic metres. Earthwork construction was revolutionized by the development of the (Fresno) scraper and other earth-moving machines such as the loader, the dump truck, the grader, the bulldozer, the backhoe, and the dragline excavator.
Mass haul planning
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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.[2]
Now they can be performed with a computer and specialized software, including optimisation on haul cost and not haul distance (as haul cost is not proportional to haul distance).
See also
[edit | edit source]- Contour trenching – Conservation technique in agriculture
- Cut and fill – Earthmoving technique to minimize labor
- Earth movers – Vehicles designed for executing construction tasks, construction/engineering vehicles used for earthworks civil engineering
- Earth structure – Building or other structure made largely from soil
- Earthworks (archaeology) – General term to describe artificial changes in land level in history and pre-history
- Gabion – Cage full of rock
- Keyline design – Landscaping to optimize water usage
- Land restoration – Process of restoring land to a different state
- Grading (earthworks) – In civil engineering, creating a profile
- Spoil tip – Pile built of accumulated spoil
- Subgrade – Material underneath a road or track
- Terrace (earthworks) – Terrain formed by tiered platforms
Calculation software
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Earthwork software is generally a subset of CAD software, in which case it often an add-on to a more general CAD package such as AutoCAD.[3] In that case, earthwork software is principally used to calculate cut and fill volumes which are then used for producing material and time estimates. Most products offer additional functionality such as the ability to takeoff terrain elevation from plans (using contour lines and spot heights); produce shaded cut and fill maps; produce cross sections and visualize terrain in 3D.[4] The means by which volumes are calculated in software can differ quite considerably leading to potentially different results with the same input data. Many software products use methods based on triangulated irregular networks (TINS) and triangular prism volume algorithms, however other calculation methods are in use based on rationalizing elevations into high density grids or cross-sections.[5][6][7]
A few programs are specialised in earthworks transport optimization and planning the construction works.
References
[edit | edit source]- ^ a b Frederick S. Merritt, M. Kent Loftin, Jonathan T. Ricketts, Standard Handbook for Civil Engineers, Fourth Edition, McGraw-Hill Book Company, 1995.
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External links
[edit | edit source]- Error creating thumbnail: File missing Media related to Lua error in Module:Commons_link at line 62: attempt to index field 'wikibase' (a nil value). at Wikimedia Commons
- Saving Old Dirt: The Preservation of Earthworks at the American Battlefield Trust
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