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Tterribilis    0

I need some help, guys.  I think i'm in over my head.
Yes, that was a pool pun =)

We're building a pool on the side of a fairly steep mountain, in central Mexico.   We've dug down to bedrock, and built a concrete and rebar reinforced stone box .   All of the walls are interconnected, and are 5 feet thick at the base, and 2 feet thick at the tops.   The columns in the walls are connected to concrete and rebar cross members in the floor.base of the box. and the box is about 6 feet deep at it's leading edge.   
The plan is to fill that with 30' X 30" box with crushed stone and then put a fiberglass pool in it.   The problem is that I don't know anything about the weight distribution of crushed stone and when i sit a 70 ton bowl of water on it....what the outward pressure on those walls will be.
I know that if you build a mound of crushed stone...you can drive a 40 ton excavator onto it and the sides of the mound don't move at all.....but that's not in a box...and it's not 70 tons.
If we were home in the states, i could rely on  code enforcement to help me with his problem....but there's no such thing as code where we are, and there's no yellow pages to just dial up a civil engineer.
Can  anyone tell me anything about the weight distribution of crushed stone as a base aggregate?

Edited by Tterribilis

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