Proceedings of GeoCongress 2012, held in Oakland, California, March 25-29, 2012. Sponsored by the Geo-Institute of ASCE. GSP 225 contains 463 peer-reviewed papers integrating current geotechnical research and practice. Papers explore recent advances, sustainability, the use of new technologies, and cast histories. Topics include: foundations; earth stability; soil properties; geotechnical engineering education; pavements; geotechnical earthquake engineering; analytical, numerical, and physical modelling; unsaturated soils; site characterisation, in situ testing, and monitoring; rock and underground space; geo-environmental engineering; and emerging topics. These papers are valuable to geotechnical researchers and engineers, especially those interested in blending the latest current research with the best of engineering practice.