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By Furushima M.

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Extra info for A Birational Construction of Projective Compactifications of C 3 with Second Betti Number Equal to One

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Predictions and Observations of Groundwater Conditions During a Deep Excavation in Boston, J. Boston Soc. , Boston, MA, Fall/Winter 1993. 11. , High Capacity Micropiles — Basic Principles and Case Histories, Proc. Third National Conf. Geo-Institute Amer. Soc. , UrbanaChampaign, IL, June 1999. 12. D. et al. , April 1982. 13. , Frozen Ground for Building Support — Implementation of Innovative Engineering Concepts for Tunneling at Russia Wharf, Proc. N. Amer. Tunnel. 2000, Boston, MA, June 2000.

Soldier Piles Granular or See remarks and Lagging stiff above for cohesive timber soils. shoring. Steel Sheet Piling Slurry Walls Underpinning Required? Overview Comments 5 feet to 15 feet Yes, if adjacent Simple buildings and excavations for utilities are close small to excavation. buildings and utility trenches. 40 feet to 50 feet Yes, if adjacent buildings and utilities are close to excavation, but underpinning can be minimized and possibly eliminated if the structural system is very stiff. See comment above for soldier piles and lagging.

The project engineers came up with the idea of excavating a trench in the river bottom, floating a prefabricated steel tunnel section over the trench, and sinking it in place onto the trench bottom. This was done in 50 feet long segments that were joined together forming watertight seals, and backfilled with soil and concrete. The concrete backfill and soil cover were designed to provide sufficient weight so that the tunnel sections would not float when the completed tunnel was dewatered to permit construction of the final lining and tracks.

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