Environmental Engineering Reference
In-Depth Information
(c) Prevent damage to the mesh from rockfill washing off the top of the dam by ensuring
that the meshed section is always the highest point on the dam section. Rapid “clo-
sure” methods are needed if flooding is predicted;
(d) Anchoring the mesh into the dam in such a way that the anchors are always protected
from erosion by the next layer of fill i.e. crank-shaped anchors (Googong); inclined
anchors (Clarrie Hall); anchors fixed to grouted dowells (Mackintosh);
(e) Anchor length is determined by slip circle or wedge analysis, with anchor forces
included. Pore pressures are estimated from design charts (see Fitzpatrick, 1977 and
Lawson, 1987) or preferably by hydraulic model tests.
(f)
The mesh is anchored into the abutment to prevent it being eroded out. Flow con-
centrates in this area during overtopping. Concrete protection may be provided (as in
Clarrie Hall).
Detailing is vitally important and reference should be made to the papers referenced in
ANCOLD (1982) and ICOLD (1984).
Search WWH ::




Custom Search