Massachusetts Bay Transportation Authority
URS/DMJM + Harris JV
— January 2008
Sub-consultant for NATM design.
Silverline Phase III is an underground extension of the Silver Line from the current terminal at South Station into Downtown Boston. The tunnels through Boston's Chinatown lie up to 25m below surface and include ca. 1400m long-running tunnels, two stations and complex underground junctions. The NATM design alternatives for LRT / Busway tunnels are located beneath existing subway stations and running tunnels. 3D modelling tools were utilised to create multiple alignments.
Made ground, peat, glacial till (cohesive, plastic), Boston Blue Clay and sand.