Analysis of a Floodplain I-Wall Embedded in Horizontally Stratified Soil Layers During Flood Events Using Corps I-Wall Software Version 1.0
U.S. Army Engineer Research and Development Center Vicksburg United States
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The purpose of the I-Wall Analysis R and D effort is to provide the U.S. Army Corps of Engineers USACE districts with essential tools in analyzing and evaluating I-Wall performance in riverine, fluvial, and coastal environments. This report summarizes an engineering methodology and its implementation in the software Corps I-Wall, Version 1.0. The program is referred to as CI-Wall. This initial version of Corps I-Wall is used for the design of new I-Walls or the analysis of existing I-Walls in floodplains i.e., I-Walls embedded in level ground during flood loading. Horizontally stratified soil layers are assumed for Version 1.0. Other CI-Wall software engineering analysis capabilities include total stress andor effective stress earth pressure calculations Rankine, Coulomb, or logarithmic spiral based earth pressure coefficients hydrostatic pore water pressure computed from surface waters andor piezo metric surfaces within each of the layered soil regions pore water pressures computed from line of seepage, steady-state seepage in soil regions with different hydraulic conductivities gap initiation and propagation using hydraulic fracturing criterion and boundary pressures e.g., for wave loading of coastal structures andor surface surcharge. Probabilistic analysis is a primary component of Corps I-Wall for new and existing I-Wall analysis. The probabilistic analysis capabilities for the design of new I-Walls results in a statistical characterization of sheet-pile tip embedment. The probabilistic analysis capabilities for analyzing existing I-Walls include the construction of a system response curve a.k.a., fragility curve, which gives the probability of rotational instability as a function of flood elevation. Examples are provided to highlight each of these capabilities and a users manual for using the graphical user interface for CI-Wall is included.