- U.S. Army Corps of Engineers, Nashville District
- Kiewit-Advance Construction Techniques, Ltd., joint venture
- Smithville, Tennessee
- Our Role
- Quality Control, Technical Oversight, Grouting.
- 2,160 feet long, 250 feet high
- Construction Cost
- $95 million
- 5 years
- Installation of grout curtains controlled seepage and facilitated slurry wall construction
- Oversaw design and construction of soil nail walls and slope stabilization measures.
Center Hill Dam provides flood control, navigation, hydropower, recreation, water supply, and water quality benefits. Because of its highly solutioned limestone foundation and rims, seepage problems have plagued the Center Hill Dam since the first test filling of the reservoir. Cavernous features are known to exist at the site, and active seepage conditions from springs and caves located on both abutments downstream of the dam have significant discharge.
As a subcontractor and subconsultant to the Kiewit-ACT joint venture, Gannett Fleming provided a team of engineers and geologists for quality control services and technical oversight during drilling and grouting operations. These operations are being monitored using the patented IntelliGrout technology, which was jointly developed by Gannett Fleming and ACT.
The project included installation of a double-line grout curtain in the embankment foundation to control seepage and facilitate future slurry wall construction, installation of the triple-line grout curtain along the left groin foundation, installation of a cave barrier along portions of the left rim, and installation of triple- and single-line grout curtains along the remaining left rim. Gannett Fleming was also obtained readings on 36 existing piezometers that the USACE identified as critical dam safety instruments. Gannett Fleming automated these existing instruments and integrated this data into the IntelliGrout® system – that provides readings every two minutes to the IntelliGrout® operators and features capabilities to generate instrument time trend reports. This allowed monitoring of critical dam safety indicators during drilling and grouting activities to gauge the performance of the foundation treatment.
Developed automated system of existing instrumentation to permit real-time observation of the dam safety instruments during the grouting operations
Obtained readings on 36 existing piezometers that the USACE identified as critical dam safety instruments
Designed, installed, and programmed an automated instrumentation system with readings available every two minutes to the IntelliGrout® operators that features capabilities to generate instrument time trend reports.