down_up__left_right t1_j7l5m27 wrote on February 7, 2023 at 4:25 PM

Reply to comment by Edwunclerthe3rd in MTA spent twice as much on Second Ave subway consultants as it did on its construction by NYY657545

What does this matter when we generally build subways under streets not skyscrapers?

If we were building a new line under WTC 1 then the height of it could be relevant.

Creative_username969 t1_j7n3spn wrote on February 8, 2023 at 12:05 AM

My guess would be lateral/shear forces. Tall buildings are subject to a great deal of wind-related shear forces. If those forces lead to outward force being applied to sides of the foundation, then the ability of the ground surrounding the sides of the foundation to resist those forces matters.