4 ms·
Until you remove the "they" by fully automating the system.
by ethbro 10y ago
Until you remove the "they" by fully automating the system.
- gpm 10y agoPeople also tend to object to "move fast and break things" when they, and their very expensive buildings, are on top of said things and get broken as a result.
- ethbro 10y agoPoint. Although I'd assume the majority of subway routes tend to be built under roads (also bad, but less terrible)? Not sure what the geology of San Francisco / California tends to be like, but I believe most of the Manhattan skyscrapers are anchored down to the bedrock. Which I'd expect would require cutting and reinforcing vs just "drill on through".
- pjc50 10y agoUltimately you want to put passengers in the tunnel, yes?
- ethbro 10y agoFrom parent comment, I was guessing that the point of greatest risk would be during tunneling / initial bracing? Rather than final static bracing.
- pjc50 10y agoI was thinking of the NATM failures: http://www.tunneltalk.com/images/laneCoveCollapse/Ref5-Heathrow-failures-highlight-NATM-misunderstandings-Shani-Wallis.pdf http://www.tunneltalk.com/images/laneCoveCollapse/Ref5-Heath... (which were during construction, but happened in "finished" sections, I believe. NATM applies a single pass of shotcrete to the cut rock surface)