Countermeasures to Protect Bridge Piers from Scour
This report documents research on local scour at bridge piers resulting in the development and recommendation of a practical selection criteria for bridge-pier scour countermeasures, guidelines and specifications for design and construction of those countermeasures, and guidelines for their inspection, maintenance, and performance evaluation. Because of their critical role in ensuring bridge integrity and potentially high cost of these countermeasures, it is important that the most appropriate countermeasures be selected, designed, and constructed. The contents of this report are, therefore, of immediate interest to highway professionals responsible for planning, administrating, evaluating, designing, constructing, inspecting and maintaining bridges and other structures founded in erosive areas. The report is also of interest to those charged with specifying materials testing procedures and acceptable results, setting budget goals, and making policy.
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Chapter 2 Findings
Chapter 3 Testing Interpretation Appraisal and Results
Chapter 4 Conclusions and Suggested Research
Chapter 5 References
B1 Appendix B Countermeasure Selection Methodology
E1 Appendix E Guidelines for Pier Scour Countermeasures
F1 Appendix F Guidelines for Pier Scour Countermeasures
G1 Appendix G Guidelines for Pier Scour Countermeasures
H1 Appendix H Summary of Laboratory Testing Program
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AASHTO AASHTO M 288 ACB system anchors application areal extent armor layer Articulating Concrete Block ASTM ASTM International base soil bridge piers cables Chiew construction contraction scour countermeasure type coverage criteria depth downstream fabric factor of safety failure Federal Highway Administration FHWA ﬁeld Figure ﬁll ﬁlled ﬁlling ﬁlter layer ﬁlter material ﬂexible ﬂood ﬂow ﬂume ft/s gabion mattress geocontainers Geosynthetics geotextile ﬁlter gradation grain size distribution granular ﬁlter Grout-Filled grout-ﬁlled mattress guidance guidelines Heibaum hours at 2.0Vcrit Hydraulic Engineering inspection laboratory testing Lagasse Lauchlan layout lbs Class Loss/damage maintenance method non-woven partially grouted riprap performance evaluation periphery permeability pier scour countermeasure pier widths placed under water plasticity index recommended revetment riprap installation riprap layer rock sand scour hole scour protection Section sediment selection shear stress slope speciﬁcations stability standard stone subgrade surface termination detail tion turndown typically reported velocity voids wire Zevenbergen