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Ground Stabilization Methods for a Coal Combustion Product Landfill. By Victoria Howland and Scott Turgeon. Worcester Polytechnic Institute Civil and Environmental Engineering. Major Qualifying Project Stantec Project Center Center Director: Fred Hart Faculty Co-Advisor: Suzanne LePage
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Ground Stabilization Methods for a Coal Combustion Product Landfill By Victoria Howland and Scott Turgeon
Worcester Polytechnic InstituteCivil and Environmental Engineering • Major Qualifying Project • Stantec Project Center • Center Director: Fred Hart • Faculty Co-Advisor: Suzanne LePage • On-Site Stantec Advisor: Tom Pace
Problem Statement • Byproducts of coal combustion plants can cause water and soil contamination if not disposed of properly in a landfill. Given an earthquake, the landfill would be subject to various modes of failure, releasing byproducts into the surrounding environment.
Problem Statement Solutions • Identify applicable stabilization methods • Deep Soil Mixing • Mixing slurry with in-situ soil • Jet Grouting • Spraying grout into the ground • Slurry Trenching • Creating a slurry wall • Stone Columns • Creating columns from stone • Decision analysis for most suitable stabilization method
Area Replacement Ratio • Compare methods according to area replaced • Ideally 20-30% • ARR=
Address Discrepancies Cost Production Rate
Cost • Given cost per volume • Equipment, materials, labor
Schedule • Given production rates • Total time dependent on quantity
Safety • Construction can be a dangerous industry • Considered construction methods, machines, and processes for installing each stabilization technique • Same levels of safety
Proven Technology • When it was invented • Previous successes and failures • Established stabilization practice
Constructability • Ease of installing the technique into the surrounding area • Proper soil conditions, space limitations, or landmark restrictions
Client Meeting • Met with client to discuss matrix weighting • Cost = 20% • Schedule = 20% • Safety = 15% • Proven Technology = 25% • Constructability= 20%