Question: The vertical effective stress at a certain point in a loose sand is 1000lb/ft^2. If an earth quake were to occur, how much excess pore

The vertical effective stress at a certain point in a loose sand is 1000lb/ft^2. If an earth quake were to occur, how much excess pore water pressure would need to develop at this point for liquefaction to occur? Show a numerical rationale for your answer.

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