Stabilizing of Dams - Rock Anchors
The existing dam consisted of a thin 32 m high concrete arch section supported by concrete thrust blocks and concrete gravity wing walls. Earthquake specialists found that during Maximum Credible Earthquake, water would probably overtop parapet walls, resulting in dam failure.
For this reason, each of the thrust blocks and wing walls were raised by adding new concrete. To increase stability, new and existing concrete was connected with anchors.
The final design included six 27-0.6" and nine 48-0.6" DYWIDAG Rock Anchors with lengths up to 48 m. Flo-Fill /Flo-Bond epoxy coated strand was used for corrosion protection reasons.
To allow for future load adjustment and long-term monitoring, special wedge plates with external thread and load cells were used.