Environmental Engineering Reference
In-Depth Information
The crest width depends on operational requirements but may be as narrow as 4.9 m.
The crest wall is constructed after the face slab, giving a relatively wide platform on which
to work while the face slab is under construction.
At Gouhou Dam (Chen, 1993) embankment failure occurred on first filling when the
water level rose above the joint between the face slab and the crest wall (Figure 15.24).
Figure 15.23.
Crest details (ICOLD, 1989a). (A) Upstream parapet wall, (B) See detail, (C) Concrete
face, (D) Downstream parapet wall, (E) Additional rockfill if both parapet walls are omit-
ted, (F) Additional rockfill if downstream parapet wall is omitted, (G) Crest details, (H)
IGAS, (I) Concrete face, (J) Horizontal reinforcement, (K) IGAS primer, (L) Premoulded
filler, (M) Mortar pad, (N) Inclined reinforcement, (O) Detail: concrete face and upstream
parapet wall joint.
Figure 15.24.
Gouhou Dam-Crest wall details (Chen, 1993). 1. Rubber water stop; 2. Top of the intact
concrete; 3. Rubber water stop; 4. Timber Fill; 5. Transition.
