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- W846523916 abstract "Safe and economic design for the bridge foundation requires an accurate prediction of the scour depth and pattern around piers. Scour depends on the flow field as well as on the type and properties of the erodible bed. No general-purpose formula is presently available for this purpose due to complex erosion characteristics of the cohesive soils, lack of a general erosion model, and difficulty of scaling the properties of cohesive soil in scour experiments. Most of the previous experimental studies have yielded inconsistent results since the scale effects of erosion resistance were not properly taken into account. The present study focuses on the erosion potential of cohesive soils and how it is modeled in a scour experiment. Based on surface erodibility tests on natural cohesive soil samples from different locations, an erosion resistance model is presented to describe the variation of the erosion resistance with soil properties (moisture bulk density and water content). Cohesive soil can be modeled in pier scour experiments by scaling down its erosion resistance to be appropriate to the scaled down geometry and flow. A model soil (mixture of silica powder and kaolin clay) with low erosion resistance is used as erodible media. Scour around prototype circular and rectangular piers are modeled with laboratory experiments of different scales and satisfactory agreement is found for scour pattern and bottom shear stress from comparison of scaled-up experimental data at the prototype scale. Erosion resistance is found to influence scour depth and pattern. Cohesive soil is successfully modeled in pier scour experiments by modeling the erosion resistance instead of modeling the individual properties of the soil. A relationship is proposed for calculating maximum scour depth in cohesive soil as a function of pier Reynolds number and erosion resistance of the soil." @default.
- W846523916 created "2016-06-24" @default.
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- W846523916 date "2003-08-01" @default.
- W846523916 modified "2023-10-12" @default.
- W846523916 title "EXPERIMENTAL INVESTIGATION OF SCOUR AROUND BRIDGE PIERS" @default.
- W846523916 hasPublicationYear "2003" @default.
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