by inserting stones or lost bodies, e.g. compaction piles (sand drains for soil compaction E02D3/10; stressing soil while forming foundations E02D27/28)

Full Title

Improving or preserving soil or rock, e.g. preserving permafrost soil (securing of slopes or inclines E02D17/20; damming or interrupting passage of underground water E02D19/12; improving soil for agricultural purposes A01; soil stabilisation for road building or like purposes E01C21/00, E01C23/10; setting rock anchoring bolts E21D) > Improving by compacting (E02D3/11 takes precedence; compacting soil locally before or while forming foundations E02D27/26, E02D27/28) > by inserting stones or lost bodies, e.g. compaction piles (sand drains for soil compaction E02D3/10; stressing soil while forming foundations E02D27/28)