Additionally , the rock pieces may need to be crushed into smaller grades to get the right range of size for use in an embankment dam .
For a rock - fill dam , rock - fill is blasted using explosives to break the rock .
The rock pieces may need to be crushed into smaller grades to get the right range of size for use in an embankment dam .
For a rock - fill dam , rock - fill is blasted using explosives to break the rock .