Passive earth pressure problem

Tanya said:

can somebodt explain where in the last formula the mumber "320" came from. Kp=0.33. Why they put in the formula 320 instead of Kp=0.33

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civilized_naah said:

Tanya said:

can somebodt explain where in the last formula the mumber "320" came from. Kp=0.33. Why they put in the formula 320 instead of Kp=0.33

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That's full of typos, the formula for Kp is tan^2(45 + phi/2) not tan^2(45 - phi/2), which is the formula for Ka

The calculated value of Kp is 3, not 0.333 (which is Ka)

In the calculation for the force, the 320 should just be 3.0

Answer is correct

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jregieng said:

^^^ A good rule of thumb that I recommend - don't spend any more than 20 mins on any given problem! This maximizes your exposure to a breadth of problems while still offering you a fair chance to resolve confusion or errata within the problem.
JR

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