Poster

Report
Ground Stabilization Methods for a
Coal Combustion Landfill
Victoria Howland and Scott Turgeon
Worcester Polytechnic Institute, Department of Civil and Environmental Engineering
Advisors: Fred Hart and Suzanne LePage
Abstract
This project examined ground stabilization methods for potential use in a coal combustion product landfill in association with Stantec Consulting Ltd. Stabilization of landfills is necessary
to mitigate liquefaction potential and ensure the landfills success given an earthquake. Through evaluating different criteria pertaining to four stabilization methods, a decision matrix
was produced determining which method would be most suitable for implementation. The matrix is designed to be reusable by changing the weighting system to reflect the desires of a
client.
Background
Four ground stabilization methods to consider:
1. Deep soil mixing- the process of inserting columns of improved soil
in various shapes and patterns
2. Jet grouting- the addition of grout into the surrounding soil, turning
the soil into a solid mass to remove the void between particles
3. Slurry trenching- inserting retaining walls into the surrounding
ground
4. Stone columns- the process of vibrating soil into the ground to
compact it, then filling the hole with stone gravel in lifts which is also
compacted during vibration
Weighting System
Criteria
Value
Cost
20
Schedule
20
Safety
15
Proven Technoloty
25
Constructability
20
Meeting between “Engineer” (WPI students) and
“client” (Stantec employee) to understand the
needs of the client in the final product
Capstone Design
Decision Matrix
Top and side view of slurry trenched perimeter walls
Conclusions
Criteria: Cost
Schedule
Safety
Proven Technology
Constructability
Slurry trenched walls- 60’ depth, 2’ wide,
extending 75 feet back from perimeter. Total
cost- $4.5 million, Total duration- 31 months.
Acknowledgments
We would like to thank the following people for
their hard work and support during this project:
Professor Suzanne LePage, Professor Frederick
Hart, Tom Pace, Daniel Gilbert, Greg Yankey

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