Landfill Stabilization for Structural Purposesby James R. Blacklock, Univ of Arkansas at Little Rock, Little Rock, AR, USA,
Abstract: The insitu stabilization of landfills and waste disposal sites for structural and environmental purposes has recently been accomplished through the application of existing soil stabilization and ground modification technologies. This paper discusses landfill stabilization projects which have utilized two existing methods, pressure injection stabilization and dynamic compaction. The technologies for lime/fly ash (L/FA) slurry injection and dynamic deep compaction (DDC) are discussed and job photographs of contractors injection and compaction equipment on actual landfill closure construction sites are shown and case histories of injection stabilization and dynamic compaction of sanitary landfill solid waste disposal sites are presented. The use of lime slurry pressure injection (LSPI) for control of methane gas is discussed with note of pH values required for methane gas control. A proposed new combination landfill stabilization method using dynamic deep compaction followed by LSPI and L/FA slurry injection is discussed. The need for new research data to support structural landfill closure is recommended.
Subject Headings: Landfills | Slurries | Soil stabilization | Waste disposal | Compaction (material) | Construction sites | Lime
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