Boone Hydro Project
Embankment stabilization for dam safety
Quick Facts
Location
Kingsport, Tennessee
Role
Prime Contractor
Completion Date
May 2018
Project Overview
In preparation for the construction of a future cutoff wall, the Tennessee Valley Authority (TVA) sought to widen the crest of the earth embankment section of Boone Dam and improve its structural stability. The scope of work included the addition of rock fill berms on both the upstream and downstream slopes of the existing embankment, with the client determining the sequence of work, considering stability and scheduling concerns.
Project Highlights
21
Piezometers Relocated
1,500
LF of Conduit in Duct Banks
15
Standpipe Extensions
+40
Survey Monuments Built & Installed
98,700
CY of Riprap (A3 & Class B) Installed
10,500
CY of Drainage Filters
430
LF of Toe Drain with Piping & Manholes
Phillips Contribution
Phillips relocated the instrumentation and placed it back into service before berm construction, ensuring that the routing and construction of duct banks were aligned correctly to mitigate impacts on existing features and future projects. The upstream berm and apron construction included preparation of the subgrade, removal of oversized riprap from slopes, and installation of riprap (A3 and Class B). The downstream berm construction began with the installation of a filter and toe drain. This work was performed on 3:1 slopes, which limited mobility and access. The toe drain installation involved pipe installation with limited trench excavations due to concerns about dam safety. A retaining wall was constructed as the sand and aggregate were placed for the berm.
The project required extensive coordination with TVA, the Engineer, and the aggregate supplier.
AWARDS
- USSD 2022 Constructed Project of the Year
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