Protecting Existing Infrastructure Near Shafts

摘要

Staging areas for shaft construction in urban and suburban localities can be congested with existing aboveground and belowground infrastructure, and often an assessment of the impacts from construction is required. Detailed engineering analyses of the magnitude of impacts from construction-related ground movements, surface surcharge loads, and vibrations can be used to identify structures that require special construction measures. This paper discusses the various means employed at the shaft sites for the DC Water Blue Plains Tunnel project for the protection of structures using diaphragm wall settlement cutoff, deep-soil mixing, and structure strengthening, and compares predicted versus actual performance.