| 宋士杰,段志强,郭伟,任宇晓.分层土中超长钻孔灌注桩侧摩阻力预测方法讨论[J].中国水利水电科学研究院学报,2025,23(4):393-400,411 |
| 分层土中超长钻孔灌注桩侧摩阻力预测方法讨论 |
| Discussion on prediction method of unit shaft resistance of super long drilled cast-in-place pile in layered soil |
| 投稿时间：2024-07-09 |
| DOI：10.13244/j.cnki.jiwhr.20240113 |
| 中文关键词: 钻孔灌注桩 极限摩阻 荷载传递特性 静力触探试验 标准贯入试验 成层土 |
| 英文关键词:drilled cast-in-place pile ultimate shaft unit resistance load transfer characteristic CPT SPT layered soils |
| 基金项目:国家自然科学基金项目(52171273，52108335，52078336);天津市科技计划项目(20JCJQJC00220) |
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| 中文摘要: |
| 桩侧摩阻力是决定超长桩基承载力的重要因素。本文基于某高层建筑的超长钻孔灌注桩的现场桩基静载试验结果，分析了桩基在成层土中的荷载-位移发展关系和桩侧摩阻力发展特性，评估了基于静力触探试验(CPT)和标准贯入试验(SPT)结果的若干种预测桩侧极限摩阻的方法的准确性。试验结果表明：试桩表现为摩擦桩。在3种CPT方法中，Bustamante法依赖对经验摩擦系数的选择，对本地区土层桩侧极限摩阻力的预测在黏土中偏小、在粉土中偏大。建筑桩基技术规范对除地表土层以外的其他土层中的桩侧极限摩阻力的预测最为准确。SPT方法的整体精度高于CPT方法，其中Yamashita精度最高，可利用SPT试验结果建立适合本地区的经验公式以准确预测桩侧极限摩阻力。 |
| 英文摘要: |
| The unit shaft resistance of piles is an important factor determining the bearing capacity of ultra long pile foundations.Based on the on-site static load test results of a super long drilled cast-in-place pile of a high-rise building in layered soils，the bearing characteristics and unit shaft resistance development characteristics of the pile in layered soils are analyzed in this paper.The accuracy of several methods for predicting the ultimate pile friction based on the results of Cone Penetration Test(CPT) and Standard Penetration Test(SPT) are evaluated.The results indicate that the test pile behaves as a friction pile.Among the three CPT methods，the Bustamante’s method relies on the selection of empirical friction coefficients of the soil layers in this area，and the prediction of ultimate pile shaft resistance is smaller in clay and larger in silt.The JGJ94-2008 standard provides the most accurate prediction of the ultimate pile shaft resistance in soil layers other than the surface soil layer.The overall accuracy of the SPT method is higher than that of the CPT method，with Yamashita’s method having the highest accuracy.The SPT results can be used to establish an empirical formula suitable for the local area to accurately predict the ultimate pile friction. |
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