2015-10-14
350
1) The stability of gravity dams depends on …
2) Gravity dams are usually straight in plan although sometimes they may be …
3) At the surface of the reservoir, the water is exerting …
4) At the bottom of the reservoir, the water is exerting …
5) Generally the base of a concrete gravity dam is equal to …
6) For gravity dams, good impervious foundations are …
7) Gravity dams are classified as …
8) Before the construction work the stream flow must be …
9) The flow is diverted to one side of the channel by …
10) Then flow is diverted through … while work proceeds in the other half of the channel.
11) The foundation must be excavated to …
12) After excavation cavities or faults in the underlying strata are sealed with …
13) A grout curtain is placed near the heel of the dam to reduce …
14) Grout cement and water is forced under pressure into …
15) Concrete for the dam is usually placed …
16) Sections are poured …
17) Each block can stand several days before another one is poured …
18) Then blocks are sprinkled with …
19) The lateral surfaces of each section are painted with …
20) Keyways carry the shear from one section to the adjacent one and make the dam act as …
21) Metal water stops are placed in …
22) Inspection galleries may be necessary for …
23) When concrete sets, a great deal of heat is liberated and the temperature of the mass is …
24) As the concrete cools, it shrinks, and … may develop.
25) For obtaining best results the temperature of the concrete mix should be …
