- 2075 Asoj · 2 marks
Vibroflotation technique
Short answer
Vibroflotation densifies loose clean sands by inserting a vibrating probe with water jets to form a hole, then withdrawing stepwise while adding sand/gravel backfill, creating compacted columns up to 2–3 m diameter that increase relative density and liquefaction resistance.
Explain, in brief, vibroflotation techniques.
Vibroflotation is a deep compaction method for loose clean sands in which a cylindrical vibrating probe (vibroflot) densifies the soil to depths of up to about 20-30 m.
Procedure:
- The vibroflot is lowered into the ground with the help of water jets at its tip, which loosen the soil and make a hole.
- After reaching the required depth, the jets are shut off, and the vibrating action starts.
- Sand or gravel is added from the top to fill the hole, while the vibroflot is withdrawn slowly in steps.
- The vibration rearranges the grains into a denser state, forming a compacted column of about 2-3 m diameter.
- Points are repeated in a grid pattern.
It is suitable for sands with less than about 15-20% fines. It increases relative density, bearing capacity and resistance to liquefaction.
✓ Answer checked by Claude Sonnet 5.5
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