Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/28472
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dc.contributor.authorBrandon, Thomas L.-
dc.contributor.authorVroman, Noah D.-
dc.contributor.authorCorcoran, Maureen K.-
dc.contributor.authorBatool, Abeera-
dc.contributor.authorJimenez, Martha-
dc.date.accessioned2018-08-21T18:43:41Z-
dc.date.available2018-08-21T18:43:41Z-
dc.date.issued2018-08-
dc.identifier.govdocERDC/GSL TR-18-24-
dc.identifier.urihttp://hdl.handle.net/11681/28472-
dc.identifier.urihttp://dx.doi.org/10.21079/11681/28472-
dc.descriptionTechnical Report-
dc.description.abstractThis report provides a comparison of levee underseepage analysis methods using Blanket Theory and finite element analysis. Blanket Theory is a set of closed-form solutions for computing seepage pressures and flows beneath levees. These solutions were introduced in a U.S. Army Corps of Engineers (USACE) 1956 technical manual and are also shown in the 2000 version of USACE Engineer Manual, “Design and Construction of Levees.” Derivations of Blanket Theory, which have not been previously documented, are thoroughly documented in this report. These derivations include the standard seven Blanket Theory cases and provide the key assumptions necessary for the accuracy of the solution; they highlight the errors in the Blanket Theory equations shown in the 2000 USACE engineering manual. An additional Blanket Theory case, which include a cutoff wall located beneath the levee, is derived in this report. Subsequently, an evaluation of the Blanket Theory solutions is made using finite element analysis. This evaluation included the standard seven Blanket Theory cases, the additional Blanket Theory case, and layered strata. This evaluation demonstrates where the analysis methods did or did not produce similar results. The finite element analysis method is further evaluated comparing different finite element analysis software. Finally, general guidelines for performing levee underseepage finite element analysis are provided in this report.en_US
dc.description.tableofcontentsAbstract ii Figures and Tables v Preface ix Unit Conversion Factors x 1 Introduction 1 2 Derivation of Blanket Theory Equations 3 2.1 Case histories 3 2.2 Cases 2, 3, and 4 - Impervious top stratum both riverside and landside 7 2.2.1 Case 2 - Impervious top stratum both riverside and landside 7 2.2.2 Case 3 - Impervious riverside top stratum and no landside top stratum . 10 2.2.3 Case 4 -— Impervious landside top stratum and no riverside top stratum 11 2.3 Semi-pervious top stratum (Cases 5, 6, 7, 8) 13 2.3.1 Case 5 - Semi-pervious riverside top stratum and no landside top stratum 13 2.3.2 Case 6 - Semi-pervious landside top stratum and no riverside top stratum 16 2.3.3 Case 7 - Semi-pervious top strata both riverside and landside 19 2.3.4 Case 7a - Semi-pervious landside and riverside top stratum (top stratum extends infinitely landward of the levee 21 2.3.5 Case 7b - Semi-pervious landside and riverside top stratum (seepage block in the pervious substratum located landward of the levee) 25 2.3.6 Case 7c – Semi-pervious landside and riverside top stratum 29 2.3.7 Case 8 - Semi-pervious top strata both riverside and landside with sheet pile at the center of levee 33 2.3.8 Case 8a – Semi-pervious landside and riverside top stratum (top stratum extends infinitely landward of the levee) with cutoff 36 2.3.9 Case 8b (L₃ = finite distance to seepage block) 37 2.3.10 Case 8c (L₃ = finite distance to an open seepage exit) 38 2.4 Blanket Theory equations summary 39 3 Evaluation of Blanket Theory Solutions with Finite Elements Analyses 45 3.1 Introduction 45 3.2 Case 1 – No landside and riverside top stratum 47 3.3 Case 2 – Impervious landside and riverside top stratum 49 3.4 Case 3 – Impervious riverside top stratum and no landside top stratum 52 3.5 Case 4 – Impervious landside top stratum and no riverside top stratum 53 3.6 Case 5 – Semi-pervious riverside top stratum and no landside top stratum 55 3.7 Case 6 – Semi-pervious landside top stratum and no riverside top stratum 59 3.8 Case 7 – Semi-pervious top strata on riverside and landside 66 3.8.1 Case 7a – Semi-pervious landside and riverside top stratum (top stratum extends infinitely landward of the levee) 66 3.8.2 Case 7b – Semi-pervious landside and riverside top stratum (seepage block in the pervious substratum located landward of the levee) 70 3.8.3 Case 7c – Semi-pervious landside and riverside top stratum (seepage exit in the pervious substratum located landward of the levee) 73 3.9 Case 8 – Semi-pervious top strata on riverside and landside 78 3.9.1 Case 8b – Semi-pervious landside and riverside top stratum (seepage block in the pervious substratum located landward of the levee) with cutoff wall 79 3.9.2 Case 8c – Semi-pervious landside and riverside top stratum (seepage exit in the pervious substratum located landward of the levee) with cutoff wall 81 Comparison of SLIDE with SEEP/W 83 5 Issues with Numbers of Elements 85 6 General Guidelines for Finite Element Analysis 86 7 Boundary Conditions for Blanket Theory Cases 87 8 Layered Top Strata 91 9 Finite Element Boundary Conditions for Outfall Canals 100 References 102 Appendix A 103 Appendix B 107 Appendix C 121 Report Documentation Page-
dc.format.extent147 pages / 2.81 Mb-
dc.format.mediumPDF/A-
dc.language.isoen_USen_US
dc.publisherGeotechnical and Structures Laboratory (U.S.)en_US
dc.publisherEngineer Research and Development Center (U.S.)en_US
dc.relation.ispartofseriesTechnical Report (Geotechnical and Structures Laboratory (U.S.)) ; no. ERDC/GSL TR-18-24-
dc.subjectBlanket theoryen_US
dc.subjectUnderseepageen_US
dc.subjectUnited States--Army Corps of Engineersen_US
dc.subjectLeveesen_US
dc.subjectFinite element analysisen_US
dc.subjectSeepage--Analysisen_US
dc.subjectSeepage--Mathematical modelsen_US
dc.subjectFinite element method--Computer programsen_US
dc.titleComparison of levee underseepage analysis methods using blanket theory and finite element analysisen_US
dc.typeReporten_US
Appears in Collections:Technical Report

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