By Jeffrey R Keaton;Subhendu Kumar Mishra;Paul E Clopper;National Research Council (U.S.). Transportation Research Board.;National Cooperative Highway Research Program.;All authors
"This record presents a strategy for estimating the time price of scour and the layout scour intensity for a bridge based on rock, in addition to layout and development guidance for software of the method. it will likely be of curiosity to hydraulic, bridge, and geotechnical engineers answerable for designing bridge foundations on rock or upkeep engineers involved in latest bridges based on erodible Read more...
summary: "This record offers a strategy for estimating the time cost of scour and the layout scour intensity for a bridge based on rock, in addition to layout and development guidance for program of the method. it is going to be of curiosity to hydraulic, bridge, and geotechnical engineers answerable for designing bridge foundations on rock or upkeep engineers taken with latest bridges based on erodible rock."--Foreword
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Extra info for Scour at bridge foundations on rock
Example text
I do not know of any follow-on work that has assessed the potential for this problem to occur. No rockerosion-specific problems have come up in the last 10 years to my knowledge. 23 Only a problem if substructure is built on boulders, cobble, or weak or shaly bedrock. 24 25 26 There are 45 of the 285 that are considered to have a history of scour. Records are not specific on whether foundation undermining or some other mechanism is attacking channel or embankments. 27 28 29 I am not aware of any rock scour problems.
1998) point out that knowledge of the sediment concentration in the flow is insufficient for predicting abrasion loss. Suspended sediment particle trajectories are influenced by the response of water flowlines to the microtopography of the bed and turbulence. Particles of suspended sediment may be steered by the water around obstacles or be directed into obstacles obliquely depending on grain inertia. Increased sediment concentration in the flow may actually decrease the rate of erosion as sediment supply begins to protect the bed from impacts, as described by Sklar and Dietrich (1998).
I don’t know how they determined how it was potentially erodible. I’ll ask around. ” 13 This has not formally been done to date. However, we intend to evaluate the rock on which some “scour critical” bridges are founded in order to verify or modify the current scour critical rating. 14 HIBT-20 wrote memo on scourability of rock in general use. 15 16 17 18 19 20 The Office of Bridge Development works with the geologists in evaluating the quality of rock cores. We have had limited experience in using George Annandale’s Erodibility Index Method for rock foundations.