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中文摘要：
海上施工条件复杂多变增加了打桩施工的难度和复杂性,常常导致拒锤、溜桩等事故的发生。因此进行桩的可打入性分析并预估锤击数具有重要的意义。在连续打桩过程中,由于锤击反复作用,桩侧土体受到严重扰动,土体强度弱化,桩侧摩阻力明显降低,使得桩在连续贯入过程中的锤击数低于预测得到的锤击数。针对连续贯入过程中桩侧土体的强度弱化现象,对比分析了目前应用较多的线性法、非线性法、指数法、应力历史法等4种经验公式方法,针对其无法考虑土性特征对桩侧土阻力衰减的影响,基于一维应力波动理论和桩-土相互作用模型,提出了采用恢复系数法结合GRLWEAP软件来估算打桩过程中的桩侧土阻力。通过实际工程的打桩分析,与实测数据进行了对比,验证了该方法的可靠性。
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