2015-10-14
544
1) An arch dam is built in a convex arch facing …
2) It owes its strength essentially to …
3) In the arch dams, stability is obtained by …
4) 3. If the upstream face is vertical the entire weight of the dam must be carried to the foundation by…
5) An arch dam is … in plan.
6) An arch dam carries post of the water load horizontally to …
7) The thrust requires that sidewalls of the canyon be capable of …
8) Arch dams can be used only in …
9) Practically all arch dams are of …
10) Uplift forces are less important for arch dams than for gravity ones because of …
11) The simplest approach to arch analysis is …
12) Arch dams must be built on …
13) Abutments are grouted in …
14) Since the cross-section of an arch dam is relatively thin care must be taken in …
15) Concrete is placed by techniques similar to …
16) A layer of mortar is usually placed between …
17) Small arch dams are provided with …
18) Large arch dams are provided with …
19) All joints must have … and …
Decide whether the following statements are true or false according to the text.
1) An arch dam is built in a curved arch facing the reservoir.
2) An arch dam owes its strength essentially to its form.
3) Stability of an arch dam is obtained only by gravity action.
4) If the upstream face is horizontal the entire weight of the dam must be carried to the foundation by gravity.
5) The distribution of the normal hydrostatic pressure will depend upon the strength of the dam.
6) An arch dam is curved in plan.
7) An arch dam carries most of the water load horizontally to the abutments by arch action.
8) The thrust doesn’t require that sidewalls of the canyon be capable of resisting the arch forces.
9) Arch dams can be used both in narrow and broad canyons.
10) All arch dams built recently are made of concrete.
11) Arch dams have failed less then other types of dams.
12) Uplift forces are less important for gravity dams than for arch ones.
13) Ice pressure and temperature changes are more important in arch-dam design than in gravity-dam design.
14) The horizontal water load is carried by arch action alone.
15) Seams and pockets in the foundation and abutments are not grouted.
16) The cross-section of an arch dam is rather thick.
17) The section in the upper part of an arch dam is very thin.
18) Only radial construction joints are used in small arch dams.
