Transportation Research Board 2002 Annual Meeting Presentations from Workshop on Plan of Action for Scour Critical Bridges

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INNOVATIVE APPROACHES TO COUNTERMEASURE DESIGN

P.F. Lagasse, Ph.D., P.E.
Transportation Research Board
2002 Annual Meeting

Sponsored By
A2A03 Committee on Hydrology, Hydraulics and Water Quality

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1998 SCANNING REVIEW EUROPEAN PRACTICE FOR BRIDGE
SCOUR AND STREAM INSTABILITY COUNTERMEASURES

Sponsored by FHWA, TRB, AASHTO

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OBJECTIVES

• Review and Document innovative techniques to mitigate the effects of scour and stream instability at bridges.
• Evaluate for potential application in the U.S.
• Share information on U.S. practice with counterparts.

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RIPRAP

• Most common countermeasure
• Permanent countermeasure against pier scour
• Specialized equipment for placing
• Quality control
• Partially grouted riprap

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FILTERS

• Laboratory testing of geotextiles
• Geotextile containers
• Geotextile mats
• Fascine mats

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APPLICATIONS AND RECOMMENDATIONS

• Riprap and Filters
• Partially Grouted Riprap
• Update of FHWA HECs

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NCHRP PROJECT 24-07(2)COUNTERMEASURES TO PROTECT BRIDGE PIERS FROM SCOUR

OBJECTIVES

TO DEVELOP AND RECOMMEND:

1. PRACTICAL SELECTION CRITERIA FOR BRIDGE PIER SCOUR COUNTERMEASURES
2. GUIDELINES AND SPECIFICATIONS FOR DESIGN AND CONSTRUCTION
3. GUIDELINES FOR INSPECTION, MAINTENANCE, AND PERFORMANCE EVALUATION

THE COUNTERMEASURES TO BE CONSIDERED INCLUDE RIPRAP, PARTIALLY GROUTED RIPRAP, CABLE-TIED (ARTICULATING CONCRETE) BLOCKS, GABIONS, GROUT-FILLED BAGS AND MATS, AND GEOTEXTILE SAND CONTAINERS (USED AS A STAND-ALONE COUNTERMEASURE OR ASA FILTER)

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