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吹沙填海未经预处理场地PHC管桩施工过程中桩体下沉的研究
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摘要
PHC管桩为挤土沉桩模式,在一般地质条件的场地进行PHC管桩施工,因沉桩过程引起的挤土效应致使桩体上浮、向远离PHC管桩施工侧偏移等不利影响。但在"吹沙填海"未经预处理的场地进行PHC管桩施工,因"吹沙填海"层欠固结,受锤击沉桩振动影响,逐渐密实下沉,产生负摩阻力,下拉桩体,如果桩端持力层承载力和桩侧摩阻力低于负摩阻力时,会导致桩体下沉,且会向靠近PHC管桩施工侧偏移,但随"吹沙填海"欠固结层,密实程度提高,负摩阻力逐渐降低,桩体下沉和偏移速率逐渐减小,直至桩端持力层承载力和桩侧摩阻力不低于负摩阻力时,桩体趋于稳定。
PHC pipe pile to soil compaction pile mode,in the general geological conditions of the area for PHC pipe pile construction,compaction effect caused by pile driving process cause pile construction,to stay away from the floating PHC pipe pile lateral offset,etc.But in "blowing sand reclamation" without pretreatment of PHC pipe pile construction site,because of "blowing sand reclamation" layer due to consolidation,affected by the vibration hammer sinking piles,dense gradually sinks and produce negative friction resistance,the drop-down pile,if the subsoil bearing capacity of pile end and pile side friction is lower than the negative friction,can lead to pile sinking,and lateral migration to the near the PHC pipe pile construction,but as "blowing sand reclamation" owe consolidation layer,close-grained degree increase,gradually reduce the negative skin friction resistance,pile sinking and migration rate decrease gradually,until the subsoil bearing capacity of pile end and pile side friction is not lower than the negative friction resistance,pile tends to be stable.
引文

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