Gravity Dam


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Related to Gravity Dam: Arch dam, Buttress dam

gravity dam

[′grav·əd·ē ‚dam]
(civil engineering)
A dam which depends on its weight for stability.

Gravity Dam

 

a dam of reinforced concrete or stone whose resistance to forces trying to move it (the pressure of water, ice, waves, and so on) is provided principally by the forces of friction along the foundation proportional to the weight of the dam itself.

The use of a gravity dam is widespread in both rocky locations (such as in the Bukhtarma and Krasnoiarsk hydroelectric power plants) and in nonrocky soils (such as in overflow dams of the Volga hydroengineering complexes). The most economical form of its cross section is similar to a triangle or a trapezoid. The principal parameter of a gravity dam is the ratio of the thickness of the dam at its base to its height, which depends on the characteristics of the supporting soil or of the rock. This parameter varies from 0.6 for rock to 1.2 for clay. The tallest existing gravity dam (1970) is 284 m (the Grande Dixence Dam in Switzerland).

The existence of a considerable strength factor in a gravity dam permits simplification in construction by use of wide temperature, keyed expansion joints (Bratsk Hydroelectric Power Plant), cavities filled with ballast or lacking ballast (Votkinsk Hydroelectric Power Plant), longitudinal galleries, and other engineering approaches that facilitate the work of the dam and reduce its cost.

V. N. POSPELOV

References in periodicals archive ?
The composite gravity dam, 160 meters long, and 60 meter high, has been constructed under ground at intake point Nauseri having the capacity to store 10 million cubic feet water with peaking reservoir of 3.
The project involves construction of a concrete gravity dam and an 8.
The composite gravity dam, 160 meters long, and 60 meter high, has been constructed underground at intake point Nauseri having the capacity to store 10 million cubic feet water with peaking reservoir of 3.
Protection Scheme for Concrete Gravity Dam Acting by Strong Underwater Shock Wave.
The construction technology of a RCC arch dam is very similar to that of a RCC gravity dam.
THE Mullaperiyar dam is a masonry gravity dam on the Periyar River in Idukki District of Kerala at 2,890 feet above sea level.
The scope of work involves construction of concrete gravity dam (65m high), coffer dam, de-silting chamber, head race tunnel (13.
This is a concrete gravity dam at a height of 170m, which will be built across the river just downstream of the Ratle Village along with an underground power house with an installed capacity of 4X140 MWs.
It is a run-of-the-river project and envisages construction of a 52-meter high concrete gravity dam and an underground powerhouse connected to the dam by a tunnel.
eighty-foot concrete gravity dam across the river by anchoring each side
Tamil Nadu, which enjoys the custodial rights of the masonry gravity dam for 999 years under a land lease agreement reached between the British Government for its Madras Province and Travancore Princely state in 1886, argues that the dam is intact and there is no need to lower the water level or for a new dam.
The Wachusett Dam was the largest gravity dam, in the world at the time, and the Central Mass.