Abstract

Most conventional methods to predict the depth of abutment scour were developed with flume test results using cohesionless soils, and those methods have been used to the abutment scour depth prediction in cohesive soils. Generally floodplains where most abutments are located are composed of less erodible soils such as cohesive soils. Therefore those methods usually predict overly conservative scour depths. For the cost effective designs, a series of flume tests were carried out using Porcelain clay. Based on dimensional analysis and the test results, a new method to predict the bridge abutment scour depths is proposed. The new method built on the difference between the local Froude number and the critical Froude number. Because abutment scour occurs only when the local velocity is higher than the critical velocity which is the maximum velocity the channel bed material can withstand.

Highlights

  • Floodplains where most bridge abutments exist are typically composed of cohesive soils such as silts and clays

  • The critical shear stress, which is the maximum shear stress soil particles can resist from the flow, of uniformly distributed cohesionless soils linearly decreases with particle size decrease

  • The critical shear stress of cohesive soils cannot be defined by the particle size (Briaud et al 2001)

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Summary

Maximum Abutment Scour Depth in Cohesive Soils

Verfügbar unter/Available at: https://hdl.handle.net/20.500.11970/100243 Vorgeschlagene Zitierweise/Suggested citation: Jae Oh, Seung; Briaud, Jean-Louis; Chang, Kuang-An; Chen, Hamn-Ching (2010): Maximum Abutment Scour Depth in Cohesive Soils. Standardnutzungsbedingungen/Terms of Use: Die Dokumente in HENRY stehen unter der Creative Commons Lizenz CC BY 4.0, sofern keine abweichenden Nutzungsbedingungen getroffen wurden. Floodplains where most abutments are located are composed of less erodible soils such as cohesive soils. Those methods usually predict overly conservative scour depths. Based on dimensional analysis and the test results, a new method to predict the bridge abutment scour depths is proposed. Because abutment scour occurs only when the local velocity is higher than the critical velocity which is the maximum velocity the channel bed material can withstand

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SCOUR AND EROSION
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CONCLUSION

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