Abstract

Reexamination of Creep Theory in the Foundation of Weirs by Model Experiments and Elasto-Plastic FEM

Highlights

  • Creep flow theories are applied to the design criteria against piping of foundation of a weir

  • It was suggested that Terzaghi's method was more effective than the creep theory to calculate the critical water head in the seepage failure of the weir

  • Creep flow theories were reexamined by model six patterns experiments and finite element analyses that had same creep length by changing the installation position and length of cut-off wall in this study

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Summary

Introduction

Creep flow theories are applied to the design criteria against piping of foundation of a weir. Bligh's creep flow theory was developed as the empirical equation for the design of floating type weirs in permeable layer through many experiences in 1910 (Bligh). After suggestion of this theory it was indicated that vertical sections of the creep length contribute more to reduce the danger of piping than horizontal sections of the length. In the response to this, Lane (1935) suggested the weighted creep flow theory These creep flow theories were based on the assumption that the cause of piping was erosion along the contact surface between soils and weir. We conducted a series of model experiments, and evaluated these practical safety criteria and the validity of the elasto-plastic FEM by applying to the experiments

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