I'm looking for discussion on overturning for a mat footing. The site in question is south of Houston and has deep (30' investigated) saturated (H2O @ 3') clays with low strength. Torvane range 0.5 to 1.5 tsf., penetrometer range 0.75 to 2.5, UU's 0.6 to 1.8 tsf. The foundation is for a 50' to 75' tall (unknown at present), narrow vertical vessel. The footing will be lightly loaded, but I am concerned about overturning due to eccentricity. Any eccentricity could lead to differential settlements which would increase the eccentricity (and on and on) and I end up with the "leaning vessel of Houston". However, I don't want to specify deep foundations if it is not warranted. Should mat foundations be considered for this case?
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