'Dynamic compaction' as a ground improvement technique for loose granular fills:
Choose the correct answer
Is suitable for soft saturated clays
Uses repeated heavy weight drops to densify loose granular fills; depth of influence ≈ 0.5√(W×h) m
Requires chemical injection
Only works for compacted fills > 10 m deep
Correct Answer
B. Uses repeated heavy weight drops to densify loose granular fills; depth of influence ≈ 0.5√(W×h) m
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Dynamic compaction: a heavy weight (10–20 tonnes) dropped repeatedly from 10–40 m height. Impact energy densifies loose granular fills and collapsible soils. Depth of influence ≈ 0.5√(W×h) metres. Generates vibrations — not suitable near existing structures or settlements. Effective for loose sand, garbage, fill; not for saturated clays (undrained conditions — excess pore pressure).
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