United States Department of Transportation
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Development of a Design Protocol: Sustainable Stabilization of Slope Using Recycled Plastic Pin in Mississippi
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2017-10-14
[PDF-4.51 MB]
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TRIS Online Accession Number:01652812
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Edition:Final Research Report
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NTL Classification:NTL-FREIGHT-FREIGHT;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;NTL-MARINE/WATERWAYS TRANSPORTATION-MARINE/WATERWAYS TRANSPORTATION;NTL-RAIL TRANSPORTATION-RAIL TRANSPORTATION;
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Abstract:The maritime and multimodal system is an integral part of the efficient movement of the nation’s freight, which includes around 25,000 miles of commercially navigable harbors, channels, and waterways; 4 million miles of public highways and roads; and over 140,000 miles of national, regional, and local railroad networks (Bureau of Transportation Statistics, 2015). Slopes and embankments are one of the major components of the maritime and multimodal transportation infrastructure, which are often subjected to shallow landslides due to the existence of expansive clay soil. In Mississippi, the shallow slope failure is induced by the climatic (temperature and rainfall) variation that causes the shrink-swell behavior of expansive Yazoo clay soil and requires a significant budget to repair. As a cost-effective alternative, Recycled Plastic Pins (RPPs) can be utilized to stabilize shallow slope failures, to offer a sustainable option and to increase the economic competitiveness to maintain multimodal transportation infrastructure. The current study investigates the effectiveness of RPPs to stabilize shallow slope failure on Yazoo clay in Mississippi, and develops a design protocol to maintain an efficient, resilient, and sustainable multimodal transportation system. Highly plastic Yazoo clay soil samples are investigated in the laboratory to determine the physical and mechanical soil properties. The laboratory test result is utilized to conduct a safety analysis of unreinforced and RPP reinforced slope using Finite Element Method (FEM) in Plaxis, to evaluate the effectiveness of RPPs in Mississippi. The historical rainfall data are assessed in Finite Element Analysis technique over the RPP reinforced slope in coupled flow mode, and associated deformation and safety analysis is conducted to evaluate slope performance under different rainfall conditions. Based on the extended FEM analysis results, 3 m long RPPs with 0.9 m to 1.5 m spacing provide adequate support to stabilize the shallow slope failure in Mississippi.
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