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Ground Stabilization Methods for a Coal Combustion Landfill Victoria Howland and Scott Turgeon

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

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Ground Stabilization Methods for a Coal Combustion Landfill Victoria Howland and Scott Turgeon

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  1. 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 thesurrounding 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 Meeting between “Engineer” (WPI students) and “client” (Stantec employee) to understand the needs of the client in the final product Capstone Design Top and side view of slurry trenched perimeter walls Decision Matrix Criteria: Cost Schedule Safety Proven Technology Constructability Conclusions 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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