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