World Trade Center Subsurface Profile
World Trade Center Subsurface Profile
(OP)
I have been asked to be on a panel that discusses the engineering ramifications of the WTC disaster. I've practiced geotechnics for twenty years, but not in NY City. While I'm somewhat familiar with the general geology, does anyone know the general subsurface profile in the area of the World Trade Center? I understand that much of this area was built up using hydraulic fill during the first fifty years of the previous century. What is the typical depth of fill? The typical depth to rock?
Any help will be valuable and I will give the contributor credit.
Thanks.
Any help will be valuable and I will give the contributor credit.
Thanks.





RE: World Trade Center Subsurface Profile
Foundation at -22.5 m at actual bearing pressure 39 kgf/cm2 on rock. Foundation wall 90 cm thick, tied aback. Columns on 2 layers of beams, then footing. Bottom slab 2.10 m thick.
Some graphical details are given in the text.
RE: World Trade Center Subsurface Profile
For example, p. 360 have an illustration of what they looked like and read like this:
World Trade Center
"The twin steel towers, rising to a record height of 1,350 ft or 110 stories rest on the Manhattan Schist at a depth of 70 ft below street level. Estimates of the deflection of the towers under wind forces required evaluation of the modulus of elasticity of the supporting bedrock by means of large scale in-situ testing. Excavation of the entire 16-acre site occupied by the Center involved removal of 16 million cu yd of fill, soil, and rock; continual support of two operating subway tubes; and protection of the surrounding property by means of a slurry wall, tied back with inclined anchors into the rock, and later utilized as the exterior basement wall."
References at the end of the book in the Subject index gives indication referenced locations at pages 151, 173, 360 (quoted here), 366 and 367.
Hope this helps.
RE: World Trade Center Subsurface Profile
Mark Montgomery
deep foundations contractors inc.
Thornhill On Canada
mmontgomery@deepfoundations.net
RE: World Trade Center Subsurface Profile