How high can you pile a cohesionless homogeneous material consisting of particles of uniform gradation upon a structure such as pile supported marine dock of infinite area and infinite vertical load bearing capacity?

For instance, say you were stockpiling sand on a wooden wharf. You know that the wharf can easily handle a vertical load of a thousand truckloads of sand but, when the 500th load goes on top of the pile, it's goodbye wharf. How did the wharf fail?



I don't know the answer to this, but there are a couple of lines to go down:

How much will the Wharfs foundations hold? And the ground they're on?

How regular are it's piles? If they're several hundered meters apart, then it doesn't matter how strong they, but it does matter how strong the deck is.