Extreme scour effects on the buckling of bridge piles considering the stress history of soft clay

Scour is a natural phenomenon caused by the erosion or removal of streambed or bank material from bridge foundations due to flowing water. As the buckling capacity of bridge piles varies inversely with the square of the unsupported pile height, an extreme scour at the pile caused by floodwater could...

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Bibliographic Details
Published in:	Natural hazards (Dordrecht) 2015-06, Vol.77 (2), p.1143-1159
Main Authors:	Liang, Fayun, Zhang, Hao, Huang, Maosong
Format:	Article
Language:	eng
Subjects:	Bridges Bridges (structures) Buckling Civil Engineering Clay Collapse Earth and Environmental Science Earth Sciences Environmental Management Failure Floodwaters Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Hydrogeology Natural Hazards Original Paper Piles Soft clay Soil (material) Soil erosion Stress measurement Stresses Structural engineering
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Summary:	Scour is a natural phenomenon caused by the erosion or removal of streambed or bank material from bridge foundations due to flowing water. As the buckling capacity of bridge piles varies inversely with the square of the unsupported pile height, an extreme scour at the pile caused by floodwater could result in a buckling failure of the pile and collapse of the bridge. The common way to analyze the scour-affected buckling stability of bridge piles is to remove the scoured soil layers while possible changes in stress history of the remaining soils are ignored. In reality, however, the remaining soils undergo an unloading process due to scour, and its overconsolidation ratios are increased. In this study, an analytical model with modified lateral subgrade modulus is presented to investigate the extreme scour effect on the buckling of bridge piles in soft clay considering the stress history of the remaining soils. A case study is used to compare the calculated results by considering and ignoring the stress history effect. The results show that ignoring the stress history of the soft clay will overestimate the buckling capacity of bridge pile foundation under scour.
ISSN:	0921-030X 1573-0840