Kentucky River Lock and Dam No. 8
A Major Qualifying Project
for Stantec Consulting Services Inc.
Michael Kendall
Karyn Sutter
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Major Qualifying Project
Stantec Project Center
◦ Project Advisors
 Professor Suzanne LePage
 Professor Frederick Hart
◦ Stantec Consulting Service Inc. Mentors
 Daniel Gilbert
 April Welshans
 Adam Hacker
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LD 8 Foundation Improvement
◦ Karst Features
◦ Water Quantity and
Quality Concerns
◦ Foundation Stability
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Evaluate Existing Dam Conditions
Develop Design Options
Apply Evaluation Criteria to Design Options
Create a Preliminary Design of Best
Foundation Improvement Option
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Boring Layout
Water Pressure Tests
Exploratory Borings by Geological Region
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Materials
◦ Portland Cement
◦ Admixtures

Design Techniques
◦ Grout Curtain
◦ Grout Cap
Secant Walls
Diaphragm Walls
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Design Selection
◦ Evaluated Existing Conditions
◦ Developed Three Design Options
Design Options
Design
Description
Design 1
Grouting in all regions
Design 2
Grouting in all regions, secant wall in
region 2
Design 3
Grouting in all regions, secant wall in
region 2, 3 and 4
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Application of Evaluation Criteria
◦ Cost
◦ Environmental
 Permitting
◦ Risks
 Reduction in Seepage
 Foundation Damage
◦ Constructability
 Dewatering
 Site Access

Design Creation
Grouting
Region
Cut-off Walls
Recommended Grout Curtain Depth
Elevation
(NAVD88)
Region
Recommended Cutoff Depths
Approx. Length
@ 15° Inclination (ft.)
Region 1
430
72.5
Region 2
425
78.0
Region 3
453
Region 4
443
Elevation
Length (Ft.)
(NAVD88)
Region 2
465
35
52.5
Region 3
455
45
77.5
Region 4
475
35
Two Row Curtain with 16 Ft. Space
Between Rows and Injection Holes
every 6 Ft.
Each Secant Shaft Designed with a
4 Ft. Diameter with a 1 Ft. Overlap
on Each Side
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Cost
Design Option Costs
Design
Total Cost
Design 1: Grout Curtain Throughout
$2,506,804
Design 2: Grout Curtain Throughout,
$2,948,554
Secant Wall in Region 2
Design 3: Grout Curtain Throughout,
Secant Wall Regions 2, 3 and 4
$5,024,554
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Environmental
◦ Identical Permitting Requirements
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Risks
◦ Mostly Dependant on Grouting
◦ Seepage Reduction Crucial
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Constructability
◦ All Designs Practical
◦ Verifiability of Technique
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Selected Design 2: Grout Curtain Throughout
with a Secant Wall in Region 2
Design of Proposed Foundation Improvement
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Highest Water Loss Observed through Region
Two
Favorable Cost to Permeability Reduction
Ratio
Practical Design