foundation improvement evaluation
DESCRIPTION
Foundation Improvement Evaluation. A Major Qualifying Project for Stantec Consulting Services Inc . Michael Kendall Karyn Sutter. Kentucky River Lock and Dam No. 8. Worcester Polytechnic Institute Civil and Environmental Engineering. Major Qualifying Project Stantec Project Center - PowerPoint PPT PresentationTRANSCRIPT
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Foundation Improvement
EvaluationKentucky River Lock and Dam No.
8A 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
Worcester Polytechnic Institute
Civil and Environmental Engineering
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LD 8 Foundation Improvement
◦ Karst Features◦ Water Quantity and Quality Concerns◦ Foundation Stability
Problem Statement
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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
Project Scope
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Kentucky River Lock and Dam No. 8
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Boring Layout Water Pressure Tests
Site Geology
Exploratory Borings by Geological Region
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Materials ◦ Portland Cement◦ Admixtures
Design Techniques◦ Grout Curtain◦ Grout Cap
Background: Grouting
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Background: Cut-off Walls
Secant Walls Diaphragm Walls
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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
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Application of Evaluation Criteria◦ Cost◦ Environmental
Permitting◦ Risks
Reduction in Seepage Foundation Damage
◦ Constructability Dewatering Site Access
Design Creation
Methodology
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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.
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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
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Environmental◦ Identical Permitting Requirements
Risks◦ Mostly Dependant on Grouting◦ Seepage Reduction Crucial
Constructability◦ All Designs Practical◦ Verifiability of Technique
Results: Evaluation Criteria
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Selected Design 2: Grout Curtain Throughout with a Secant Wall in Region 2
Capstone Design Project
Design of Proposed Foundation Improvement
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Highest Water Loss Observed through Region Two
Favorable Cost to Permeability Reduction Ratio
Practical Design
Conclusions
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Questions?