when you build a ramp, you don't build it out of sand, you build it from more suitable material.
the rubble from the quarried stone, being plentiful, and local, would be ideal. as the ramp gets heavier, it doesn't become more unstable, it compacts, becoming more stable.
silbury hill in wiltshire is just as old as the pyramids, one quarter its size, just as steep-sided, and built entirely from piled dirt and chalk rubble, and is very stable indeed!
anything is...only as strong as it's weakest point...and the weakest point is what would keep the ramps in place and the rubble from shifting.
which in itself is very very heavy...
Isn't it all supposed to have been built in 2o years according to the orthodox view..?
There wouldn't have been time to build a Silbury Hill around the pyramid.
And if Silbury Hill had had massive weights moved up it and round it at any time I don't think it would look the same.
It would be wrecked...
You're not even supposed to climb up it now on foot...because of damage and possible subsidence...