| 摘要 |
A drill assembly is disclosed for forming in ground granular columns without the need for vibratory compaction, said drill assembly includes a first drill and a second drill, where the first drill is a tube, and the second drill includes a drill flight, wherein said first and second drills are concentric, and the second drill is configured to lie at least partially within the first drill; such that the drill assembly is configured to form the granular column with primarily vertical compaction.
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