2015-10-14
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1) Concrete-buttress dams reduce material in the wall itself without using support buttresses around the outside base.
2) There is only one type of buttress dams.
3) Only flat-slab buttress dams may be constructed in locations where the foundation rock is acceptable.
4) In cross-section buttress dams don’t resemble a triangle.
5) The thicknesses and spacing between buttresses don’t depend on the height of dam.
6) If buttresses are closely spaced they can be more massive but the slabs can be thinner.
7) Sometimes solid buttresses are used to increase the effective buttress width.
8) The slab is always rigidly attached to the buttresses.
9) Filling the joints between the slab and buttress with asphaltic putty permits each slab to act dependently.
10) Even minor settlement of the foundation won’t seriously harm the structure.
11) Flat-slab and buttress dams are used in narrow canyons.
12) Placing the buttresses on spread footings one can increase the foundation pressures.
13) The flat-slab dams require a better foundation than the multiple-arch dams do.
14) In the designing of a multiple-arch dam cantilever action is always taken into account.
15) Ice pressures and uplift forces are very important for buttress dams.
16) Buttress dams are more expensive because a great deal of formwork and reinforcing steel is required.
17) A gravity dam is less massive than a buttress dam.
18) A cut-off wall extending to rock should be always provided.
19) Powerhouses and water-treatment plants are usually placed near the buttress dams.
20) Deck and buttresses are placed in lifts of not more then 3.7 m.
21) The time for construction of gravity dams is usually less and the problem of water diversion somewhat simplified.
