unconfined compressive strength

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Someone is asking me for help with this question and I can't remember how to do it or why. Anyone? I vaguely remember that it is not 2000/100 (?) but the answer is 20ft. Or is it...

"A clay deposit has a unit weight of 100 lbf/ft3 and an unconfined compressive strength of 2000 lbf/ft2.

What is most nearly the depth at which the horizontal soil pressure is zero?"

 
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