What Is Deep Dynamic Compaction Design?
Dynamic compaction (the heavy — the 10-30 ton weight's — the dropped 30-100 feet) densifies the deep loose fills (the 20-40 foot — the influence; the crater's — the tamped). The design: the energy (the weight x drop — the 200-1,000 ton-ft), the grid (the spacing — the 10-20 foot), the passes (the 2-4 — the crater's), and the verification (the SPT — the improved). The ground's — the pounded dense.
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How compaction works
The drop (the weight's — the energy; the crater's — the 3-6 foot), the influence (the depth's — the energy's; the 20-40 foot), the passes (the multiple — the grid's; the ironing's — the surface's), and the vibration (the monitored — the neighbors'; the limits').
Design
The energy (the ton-ft — the 200-1,000; the depth's), the grid (the spacing — the 10-20 foot; the primary's/secondary's), the passes (the 2-4 — the crater's; the criteria), the wick (the drains' — the saturated's; the pore's), and the verification (the SPT/CPT — the improved; the test section's — the first).
Applications and limits
The fills (the loose — the uncontrolled; the reclaimed), the liquefaction (the mitigation — the densified), the limits (the vibration — the urban's; the clay's — the ineffective; the water's — the wicks'), and the QC (the crater's — the measured; the heave's). The compaction is the crude — the effective deep.
The bottom line
Design dynamic compaction by energy (200-1,000 ton-ft), 10-20 ft grids, and multiple passes — verify with SPT/CPT, monitor vibrations, add wick drains in saturated soils.
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