nfitz
Superstar
They might well do some cut-and-cover, but they also use TBM, according to this article:Hmmm....Shenzhen? They use cut and cover and they are a modern city (think of Hong Kong...but more modern).
New tunneling (sic) technology used in Metro line 2
Construction of a major tunnel section in the Shenzhen Metro Line 2 was completed last Sunday. The 3 kilometer finished tunnel costs 583 million yuan and runs from Antuoshan to Xiangmeibei stations. The tunnel contractor achieved a zero record of major accidents while building the tunnel. The tunnel used an advance shield tunneling technology
Toronto still uses cut-and-cover were appropriate as well, there is some on the Spadina extension, and a lot more on the design for the Yonge extension. Not surprisingly, the cheapest approach is selected, based on each location, infrastructure, and geology. Claims otherwise seem to defy common sense!