静力触探在大直径超长桩溜桩分析中的应用

doi:10.13722/j.cnki.jrme.2014.1612

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摘要静力触探在海洋岩土工程中的应用越来越广泛。随着大直径超长桩在海洋工程中的普遍应用，过大的桩锤自重使得溜桩现象在沉桩过程中频繁发生。因此对于打桩控制而言，合理的判断溜桩区间是十分必要的。针对目前所使用的API规范中桩端阻力与桩侧摩阻的计算方法对大直径超长桩不适应的问题，结合实际工程对溜桩的过程和发生机制进行探讨；利用静力触探测试数据提出在溜桩状态下土阻力的计算方法：利用LCPC(Laboratoire Central des Ponts et Chaussées)法计算桩端阻力，提出适合南海土质条件的桩侧摩阻力的分区方法，使用已有方法与灵敏度结合计算桩侧摩阻力，针对南海某平台桩基施工过程中发生的溜桩问题进行研究计算，证实建议方法的可行性，为桩基设计提供参考与依据。

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	贾沼霖1
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关键词 ：桩基础, 大直径超长桩, 溜桩, 沉桩阻力, 静力触探, 灵敏度

Abstract：Cone penetration tests are more and more widely used in ocean engineering. Super long and large diameter piles are commonly adopted for constructing ocean platform foundations. The pile-run phenomenon frequently takes place because of the great weight of both the pile and the hammer. The American Petroleum Institute(API) recommendations are commonly used to assess the static pile bearing capacity，which is the sum of the pile end resistance and the shaft friction. The calculation method for estimating the soil resistance during pile-run is different from the static bearing capacity calculation and should be associated with practical engineering observation. Based on the cone penetration test(CPT) data，a procedure for calculating the soil resistance is put forward，in which the shaft friction is computed by using existed method and the tip bearing capacity computed by the improved Laboratoire Central des Ponts et Chaussées(LCPC) method. By comparing the soil resistance and the weight of the pile plus the hammer，the equilibrium conditions of pile-run can be established. The suggested method has been used to predict pile-up in a project in the South China Sea，and the calculated results agree well with the observed data，indicating that the proposed method may be helpful to the pile foundation designers in ocean engineering.

Key words： pile foundation long and large diameter piles pile-run soil resistance cone penetration test(CPT) sensitivity

引用本文:

贾沼霖1，闫澍旺1，杨爱武2，张孝卫3. 静力触探在大直径超长桩溜桩分析中的应用[J]. 岩石力学与工程学报, 2016, 35(S1): 3274-3282.
JIA Zhaolin1，YAN Shuwang1，YAN Aiwu2，ZHANG Xiaowei3. Application of cone penetration test for the analysis of pile-run of long and large diameter piles in offshore geotechnical engineering. , 2016, 35(S1): 3274-3282.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.1612 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/3274

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