How it will actually happen depends on its structural and dynamic characteristics, and on what type of infrastructure is in existence to provide exits.
My bet is that it will be neither crushed nor fly apart, but that it will instead crumble. It will be too big and homogenous to provide any good room to attach to firmly at its perimeter, and those loosely held at that perimeter will have a tough time hanging on, and will fall to the ground--crumbling, as it were. There will still be a solid core, with a crumbly mantle.
The crumbs will fall and aggregate on the ground, until they themselves begin to provide viable options for agglomeration, as opposed to the USD.