HYDRAULIC MODEL STUDY OF SPUR DIKES FOR HIGHWAY BRIDGE OPENINGS
THE LABORATORY STUDY IS BEING CONDUCTED IN A FLUME 16 FT WIDE AND 84 FT LONG, WITH AN ERODIBLE BED OF FINE SAND TO DETERMINE AREAS OF SEVERE SCOUR. VARIOUS LENGTHS, SHAPES AND POSITIONS OF SPUR DIKES WITH RESPECT TO THE BRIDGE ABUTMENTS HAVE BEEN TESTED UNDER CONDITIONS OF A FIXED DISCHARGE OF 4.8 CFS, 0.4-FT NORMAL DEPTH DOWNSTREAM OF THE CONTRACTION, AND A FIXED CONTRACTION OF 50 PERCENT IN THE FLUME. THE SPUR DIKES WERE MADE ERODIBLE BY USING A LEAN SAND-CEMENT- BENTONITE MIXTURE TO OBSERVE AREAS OF EROSION IN THE SPUR DIKE. WHEN SPUR DIKES ARE USED AT THE ABUTMENT OF A BRIDGE, THE FLOW ALONG THE HIGHWAY EMBANKMENT IS DISRUPTED AND REDIRECTED TO MAKE MORE EFFECTIVE USE OF THE BRIDGE OPENING. UNDER SUCH CONDITIONS THE SCOUR HOLE, WHICH USUALLY FORMS AT THE BRIDGE ABUTMENT, IS REDUCED AND A NEW SCOUR HOLE IS FORMED UPSTREAM IN THE VICINITY OF THE NOSE OF THE SPUR DIKE WHERE THERE IS RELATIVELY LITTLE DAMAGE DONE TO THE BRIDGE STRUCTURE. /AUTHOR/
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Supplemental Notes:
- Vol 29, No 4, P 40
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Authors:
- Karaki, S S
- Publication Date: 1959-4
Media Info
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Serial:
- Highway Research Abstracts
- Publisher: Highway Research Board (HRB)
Subject/Index Terms
- TRT Terms: Bridge abutments; Highway bridges; Hydraulic structures; Scour; Spur dikes
- Uncontrolled Terms: Hydraulic models
- Subject Areas: Highways; Hydraulics and Hydrology;
Filing Info
- Accession Number: 00204423
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: May 22 1972 12:00AM