Reinforced Earth Walls Accommodate Settlement in Alexandria, LA PDF
Preview Reinforced Earth Walls Accommodate Settlement in Alexandria, LA
Reinforced Earth Walls in Alexandria, La. Accommodate Settlement The safe way is the only way September 2012 Early RECo History in the USA • This wall was part of a FHWA demonstration Project which included 10 other projects. • Most of the demonstration projects were on difficult Sites – such as this slide Correction. 1st Reinforced Earth Wall in the United States (1971) - Slide Correction – California September 2012 2 Early RECo History in the USA • Reinforced Earth released from “experimental” status • Usage by DOT’s mushroomed • Many 1,000s of structures • Millions of sq ft of walls • Most structures were more routine – non-difficult sites • 15 years after the first RE wall was but in California, the Louisiana DOTD planned to build I-49 from Shreveport to Alexandria. • Retaining walls were planned in the urban areas of Shreveport and Alexandria. September 2012 3 1986 - Louisiana DOTD I-49 Shreveport to Alexandria Routine MSE Walls – no Foundation issues Difficult MSE Wall Considering compressible soils (Focus of Presentation) September 2012 4 I-49 Shreveport – 581,000 SF of Reinforced Earth Walls September 2012 5 I-49 Alexandria – Reinforced Earth Walls Focus of Presentation will be on the Alexandria Wall. Fact about the project Compressible Soils consideration beneath the Reinforced Earth walls 78,000 SF – Multiple Projects – Opportunity for significant savings compared to the C.I.P. Walls 24 FT Max. Height September 2012 6 I-49 Alexandria – Cast-in-Place Wall Details Original C.I.P. Wall September 2012 7 I-49 Alexandria – Piling Layout Original C.I.P. Wall September 2012 8 I-49 Alexandria – Reinforced Earth Walls Focus of Presentation will be on the Alexandria Wall. Fact about the project Compressible Soils consideration beneath the Reinforced Earth walls 78,000 SF – Multiple Projects Opportunity for significant savings compared to the C.I.P. Walls 24 FT Max. Height LA DOTD elected to utilize the Flexibility of Reinforced Earth technology Specified Construction Staging with and without Wick Drains September 2012 9 Flexibility of Reinforced Earth Walls • First – Let look at the Flexibility of the Reinforced Earth wall Soil & reinforcements can handle almost any settlement Differential Settlement of facing panels governs - this is the limiting constraint Allowable Total Settlement up to 30” For excessive settlement (total or differential), consider: Vertical Slip Joint Covers 2-Stage Wall Technology Why are RECo facing panels flexible? It’s about the joints September 2012 10
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