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Geotechnical Limit to Scour at Spill-Through Abutments
For spill-through bridge abutments adjoining waterways, practically all field cases of failure attributable to scour show a geotechnical failure of the spill slope of earthfill embankment associated with the abutment. The extent of scour and the maximum scour depth attainable at an abutment indeed are limited by the geotechnical stability of the earthfill embankment at the abutment. For a given design flow, the stability of the embankment limits scour depth. The actual region of scour leading to embankment failure is itself unremarkable. Typically, scour depths at spill-through abutments are modest, at least when viewed after the flood event producing the scour, and when other factors such as channel morphology effects are excluded. Though numerous illustrations of scour at spill-through abutments show failed embankment and channel bank, methods currently available for estimating scour do not address the geotechnical aspects of scour at spill-through abutments. This paper presents a method for relating scour depth to the strength properties of an abutment's compacted earthfill embankment.
Geotechnical Limit to Scour at Spill-Through Abutments
For spill-through bridge abutments adjoining waterways, practically all field cases of failure attributable to scour show a geotechnical failure of the spill slope of earthfill embankment associated with the abutment. The extent of scour and the maximum scour depth attainable at an abutment indeed are limited by the geotechnical stability of the earthfill embankment at the abutment. For a given design flow, the stability of the embankment limits scour depth. The actual region of scour leading to embankment failure is itself unremarkable. Typically, scour depths at spill-through abutments are modest, at least when viewed after the flood event producing the scour, and when other factors such as channel morphology effects are excluded. Though numerous illustrations of scour at spill-through abutments show failed embankment and channel bank, methods currently available for estimating scour do not address the geotechnical aspects of scour at spill-through abutments. This paper presents a method for relating scour depth to the strength properties of an abutment's compacted earthfill embankment.
Geotechnical Limit to Scour at Spill-Through Abutments
Ettema, R. (author) / Nakato, T. (author)
International Conference on Scour and Erosion (ICSE-5) 2010 ; 2010 ; San Francisco, California, United States
Scour and Erosion ; 125-131
2010-10-29
Conference paper
Electronic Resource
English
Geotechnical Limit to Scour at Spill-Through Abutments
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