THE BIG DIG
The Boston Central Artery or “Big Dig” rerouted the Central Artery (Interstate 93) into a 3.5-mile (5.6 km) tunnel. The project also included the construction of the Ted Williams Tunnel, the Leonard P. Zakim Bunker Hill Memorial Bridge over the Charles River and the Rose Kennedy Greenway. The construction work was done between 1991 and 2006; and the project concluded on December 31, 2007. The foundations consisted of both drilled piles and diaphragm walls. The soil conditions varied greatly and included the difficult Boston Blue Clay as well as liquefiable soils closer to the bay. Seawater intrusion was also a concern. Based on the expected difficulties multiple companies contacted KB International to assist with the design and application of the polymer slurries for both the drilled piles and diaphragm walls. In the end, KB was involved with 80% of the foundation excavations. The following is a list of the companies that utilized KB’s technologies and the portions of the projects completed.
Obayashi - Modern JV
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