heap up
Stack into mounds
To heap up is to accumulate in a pile or mass: Snow heaped up against the fence, They heaped up firewood for the winter.
The phrase often suggests abundance or excess—heaping up wealth, praise, or troubles.
It can also mean to load generously: She heaped up his plate with potatoes.
pile
Accumulated mass of objects
stockpile · store · aggregate · accrue · cumulate · buildup · collect · compile · squirrel away · bank
spatial arrangement/distribution
heap upscatter
Distribute in random directions
spread out · disperse · strew · distribute · disseminate