Systematic procedures have been developed for (1) assessing the need for ground and/or foundation improvement to mitigate liquefaction risk to bridges, (2) selecting and designing appropriate remediation measures, and (3) evaluating the effectiveness of improvements performed in the field. These procedures are presented and discussed in relation to the seismic retrofit of existing bridges.

Performance criteria used to evaluate the potential for liquefaction-induced damage to bridges are introduced. A review is provided of the suitability of different ground and foundation improvement methods for use at various abutment and pier types. Key issues in the design of ground improvement measures are highlighted. The importance of soil properties in the assessment and design of mitigation measures is discussed, as well as the role of in-situ testing for obtaining those properties.

¹Doctoral Candidate, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061-0105
²University Distinguished Professor, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061-0105

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