Exploration of Vibro-Compaction Technology of Dredged Backfill Sand in Airport Runway Area
Based on Shenzhen Third-Runway expansion project,the vibro-compaction technology of dredged backfill sand in airport runway area was researched and analyzed from the aspect of application.The backfill sand should be randomly inspected before vibroflotation,so a feasibility analysis was carried out according to sand particle gradation,which led to the suitable number of the sand material to be reinforced by using vibro-compaction method.In addition,an appropriate vibroflotation plan was selected,various means were used to determine the vibroflotation spacing and depth,and a typical experimental study could be conducted accordingly.The research shows that non-filler vibroflotation can achieve a better compaction effect subject to the spacing being controlled well.Double or multi-point resonance superposition effect can be considered while determining the spacing.As for the backfill sand layer with pore seawater,its strength growth is of time effect at the end of vibroflotation construction.
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