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- Gravity_dam abstract "A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by primarily utilizing the weight of the material alone to resist the horizontal pressure of water pushing against it. Gravity dams are designed so that each section of the dam is stable, independent of any other dam section.Gravity dams generally require stiff rock foundations of high bearing strength (slightly weathered to fresh); although they have been built on soil foundations in rare cases. The bearing strength of the foundation limits the allowable position of the resultant which influences the overall stability. Also, the stiff nature of the gravity dam structure is unforgiving to differential foundation settlement, which can induce cracking of the dam structure.Gravity dams provide some advantages over embankment dams. The main advantage being that they can tolerate minor over topping flows as the concrete is resistant to scouring. This reduces the requirements for a cofferdam during construction and the sizing of the spillway. Large overtopping flows are still a problem, as they can scour the foundations if not accounted for in the design. A disadvantage of gravity dams is that due to their large footprint, they are susceptible to uplift pressures which act as a de-stabilising force. Uplift pressures (buoyancy) can be reduced by internal and foundation drainage systems which reduces the pressures.During construction, the setting concrete produces a exothermic reaction. This heat expands the plastic concrete and can take up to several decades to cool. When cooling, the concrete is in a stiff state and is susceptible to cracking. It is the designers task to ensure this doesn't occur. The most common classification of gravity dams is by the materials composing the structure: Concrete dams include mass concrete dams, made of: conventional concrete: Dworshak Dam, Grand Coulee Dam Roller-Compacted Concrete (RCC): Willow Creek Dam (Oregon), Upper Stillwater Dam masonry: Pathfinder Dam, Cheesman Dam hollow gravity dams, made of reinforced concrete: Braddock DamComposite dams are a combination of concrete and embankment dams. Construction materials of composite dams are the same used for concrete and embankment dams. Gravity dams can be classified by plan (shape): Most gravity dams are straight (Grand Coulee Dam). Some masonry and concrete gravity dams have the dam axis curved (Shasta Dam, Cheesman Dam) to add stability through arch action.Gravity dams can be classified with respect to their structural height: Low, up to 100 feet. Medium high, between 100 and 300 feet. High, over 300 feet.↑ ↑ ↑".
- Gravity_dam thumbnail Willowcr.jpg?width=300.
- Gravity_dam wikiPageID "866595".
- Gravity_dam wikiPageLength "4172".
- Gravity_dam wikiPageOutDegree "20".
- Gravity_dam wikiPageRevisionID "707918910".
- Gravity_dam wikiPageWikiLink Braddock_Locks_&_Dam.
- Gravity_dam wikiPageWikiLink Category:Dams_by_type.
- Gravity_dam wikiPageWikiLink Category:Gravity_dams.
- Gravity_dam wikiPageWikiLink Cheesman_Dam.
- Gravity_dam wikiPageWikiLink Cofferdam.
- Gravity_dam wikiPageWikiLink Dam.
- Gravity_dam wikiPageWikiLink Dworshak_Dam.
- Gravity_dam wikiPageWikiLink Embankment_dam.
- Gravity_dam wikiPageWikiLink Grand_Coulee_Dam.
- Gravity_dam wikiPageWikiLink Masonry.
- Gravity_dam wikiPageWikiLink Mass_concrete.
- Gravity_dam wikiPageWikiLink Pathfinder_Dam.
- Gravity_dam wikiPageWikiLink Resultant_force.
- Gravity_dam wikiPageWikiLink Roller-compacted_concrete.
- Gravity_dam wikiPageWikiLink Shasta_Dam.
- Gravity_dam wikiPageWikiLink Upper_Stillwater_Reservoir.
- Gravity_dam wikiPageWikiLink Willow_Creek_Dam_(Oregon).
- Gravity_dam wikiPageWikiLink File:Willowcr.jpg.
- Gravity_dam wikiPageWikiLinkText "Concrete gravity".
- Gravity_dam wikiPageWikiLinkText "Gravity dam".
- Gravity_dam wikiPageWikiLinkText "Gravity".
- Gravity_dam wikiPageWikiLinkText "Masonry gravity dam".
- Gravity_dam wikiPageWikiLinkText "concrete gravity dam".
- Gravity_dam wikiPageWikiLinkText "concrete gravity".
- Gravity_dam wikiPageWikiLinkText "concrete-walled gravity".
- Gravity_dam wikiPageWikiLinkText "gra".
- Gravity_dam wikiPageWikiLinkText "gravity dam".
- Gravity_dam wikiPageWikiLinkText "gravity section".
- Gravity_dam wikiPageWikiLinkText "gravity sections".
- Gravity_dam wikiPageWikiLinkText "gravity type of dam".
- Gravity_dam wikiPageWikiLinkText "gravity".
- Gravity_dam wikiPageWikiLinkText "gravity-type concrete dam".
- Gravity_dam wikiPageWikiLinkText "gravity-type".
- Gravity_dam wikiPageWikiLinkText "mass concrete gravity".
- Gravity_dam wikiPageWikiLinkText "sheer weight".
- Gravity_dam wikiPageUsesTemplate Template:Citation_needed.
- Gravity_dam wikiPageUsesTemplate Template:Cite_book.
- Gravity_dam wikiPageUsesTemplate Template:Reflist.
- Gravity_dam wikiPageUsesTemplate Template:US-dam-stub.
- Gravity_dam subject Category:Dams_by_type.
- Gravity_dam subject Category:Gravity_dams.
- Gravity_dam hypernym Dam.
- Gravity_dam type Dam.
- Gravity_dam type Dam.
- Gravity_dam comment "A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by primarily utilizing the weight of the material alone to resist the horizontal pressure of water pushing against it. Gravity dams are designed so that each section of the dam is stable, independent of any other dam section.Gravity dams generally require stiff rock foundations of high bearing strength (slightly weathered to fresh); although they have been built on soil foundations in rare cases.".
- Gravity_dam label "Gravity dam".
- Gravity_dam sameAs Q3497167.
- Gravity_dam sameAs Sypaná_hráz.
- Gravity_dam sameAs Gewichtsstaumauer.
- Gravity_dam sameAs Presa_de_gravedad.
- Gravity_dam sameAs Gravitatsioonipais.
- Gravity_dam sameAs Barrage_poids.
- Gravity_dam sameAs Bendungan_Gravitasi.
- Gravity_dam sameAs Barragem_de_gravidade.
- Gravity_dam sameAs m.0wywn2z.
- Gravity_dam sameAs Гравитационная_плотина.
- Gravity_dam sameAs Гравітаційна_гребля.
- Gravity_dam sameAs Q3497167.
- Gravity_dam sameAs 重力坝.
- Gravity_dam wasDerivedFrom Gravity_dam?oldid=707918910.
- Gravity_dam depiction Willowcr.jpg.
- Gravity_dam isPrimaryTopicOf Gravity_dam.