A "rubble pile" refers to a mess or heap of broken pieces of rocks or debris, often resulting from the destruction of buildings or structures. Full definition
Some clear steps include monitoring the internal temperature of rubble piles and scattering them before heat from fermentation builds up to dangerous levels. (sciencemag.org)
What's more, it is twirling at a rate that could tear a loosely - bound rubble pile apart. (scientificamerican.com)
Mathilde is like a loose rubble pile with the density of water. (solstation.com)