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Ground Improvement Dr. Talat Bader. Dynamic Compaction. Dynamic Deep Compaction. Dynamic compaction was first used in Germany in the mid-1930’s. Menard technique France Dynamic Deep Compaction is simply the dropping of heavy weights on ground surface to densify soils at depth.

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Presentation Transcript
dynamic deep compaction
Dynamic Deep Compaction
  • Dynamic compaction was first used in Germany in the mid-1930’s.
  • Menard technique France
  • Dynamic Deep Compaction is simply the dropping of heavy weights on ground surface to densify soils at depth
why dynamic deep compaction
Why Dynamic Deep Compaction
  • Reduce foundation settlements
  • Reduce seismic subsidence
  • Permit construction on fills
  • Densify garbage dumps
  • Improve mine spoils
  • Induce settlements in collapsible soils
important construction conditions

h

w

}

Important Construction Conditions
  • The Drop Weights ranges from 8 to 200 tons
  • Drop Heights ranges from 50 to 100 ft.
  • Impact grids of 7 x 7 ft to 20 x 20 ft
  • Minimum 100-150 ft clearance from any structure
  • Review site for vibration sensitivity
  • Primarily for silts and sands but also clays
limitations
Problems near groundwater

Multiple passes to compact at depth

Limitations
important terms
Important Terms
  • Effective Depth -- Maximum depth of ground improvement
  • Zone of Major Densification -- About upper 2/3 of effective depth
  • Energy Level -- Energy per blow (weight times drop height)
  • Energy Intensity Factor -- Involves energy level, spacing, and number of blows
depth of influence
Depth of Influence

w = Weight of drop (Tons)

h = Height of drop (m)

D = Depth of influence (m)

C = Factor= .3-.7 Depends on soil type

From Holtz and Kovacs, 1981

important geotechnical parameters
Important Geotechnical Parameters
  • Soil conditions
  • Groundwater level
  • Relative density
  • Degree of saturation
  • Permeability
quality control
Quality Control
  • Crater depths (map)
  • Surface elevation monitoring
  • Decrease in depth of weight penetration with successive drops
  • Pore pressures
  • Geophysical monitoring
thank you

Question Time

Thank you

Dr. Talat Bader