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Proceedings of sessions of Geo-Congress '98, held in Boston, Massachusetts, October 18-21, 1998. Sponsored by the Geo-Institute of ASCE.

This Geotechnical Special Publication contains 10 papers focusing on innovations in design and construction of earth-retaining systems, design criteria, specialty testing programs, and instrumentation monitoring. Most papers focus on the design and construction aspects of various segments of the Central Artery/Tunnel project in Boston, including:

•  proposed soil-cement mixing in the Fort Point Channel;
•  design of the jacked tunnels that run underneath railroad tracks leading to South Station;
•  instrumentation used on a project-wide basis with emphasis on the soil-mix and jacked tunnel sections;
•  base stability issues and effects of soil-cement treatment;
•  design and performance of a tied-back sheet pile wall in soft clay; and
•  a case study of a Casting Basin.

Other papers describe anchored, deep soil-mixed cutoff walls and design-build tied-back walls in Wisconsin; the use of soil nails in soft clay; deep excavations in Berlin, Germany; and precast, prestressed slurry walls.