基于CPTU测试的抗拔桩承载特性评价方法

doi:10.13722/j.cnki.jrme.2022.0660

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摘要抗拔桩基础广泛应用于沿海地区的地下空间，这些区域结构物的抗拔特性是必须要评价的工程指标。许多学者对基于CPTU测试预测桩基抗拔承载特性的方法进行研究，提出针对特定场地的经验公式。这些经验公式在应用于当地的测试场地时存在较大的局限性。为此，提出针对于沿海地区软弱土层的基于CPTU的预测桩基抗拔承载特性的方法。首先通过进行模型试验，研究桩基的长径比、桩表面粗糙程度对于抗拔桩承载能力的影响，明确抗拔桩在工作过程中的受力机制以及桩–土之间的相互作用机制，并通过数值模拟分析进一步验证模型试验得到的结果。在模型桶内进行CPTU测试，建立桩侧摩阻力与CPTU测试参数之间的经验关系。在温州某软弱土工程场地对本文所提出的经验关系进行应用，结果表明：基于所提方法计算的抗拔桩承载力与实测结果误差仅为7.7%，低于其他方法的计算结果，计算精度较高，在预测软弱土中的抗拔桩承载能力方面具有较高的适用性。

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	冯华磊1
	刘东明1
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	蔡国军1
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	段伟1
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关键词 ：桩基础, 抗拔桩, 模型试验, 数值模拟, CPTU, 承载特性

Abstract：Uplift pile foundation is widely used in underground space in coastal areas. The uplift characteristics of structures are the engineering indices that must be evaluated. Many scholars have studied the prediction methods of the uplift bearing characteristics of pile foundation based on CPTU test，and proposed the empirical formula for specific site. These empirical formulas have great limitations when applied to local sites. Therefore，a method based on CPTU is proposed to predict the uplift bearing characteristics of pile foundation in soft soil layer in coastal areas. Model tests were carried out to study the influence of the length-to-diameter ratio of pile foundation and the roughness of pile surface on the bearing characteristics of the uplift pile. The mechanical mechanism of the uplift pile in the working process and the interaction mechanism between pile and soil were studied. The results of the model tests were further verified by numerical simulation analysis. The CPTU test was carried out in the model bucket. The empirical relationship between pile side friction resistance and CPTU test parameters was established. The empirical relationship proposed in this paper is applied to a soft soil engineering site in Wenzhou. The error between the uplift pile bearing capacity calculated by the proposed method and the measured results is only 7.7%，lower than other methods of calculation results. The calculation accuracy is higher and it has a high applicability in predicting the bearing characteristics of uplift pile in soft soil.

Key words： pile foundation uplift pile model test numerical simulation CPTU bearing characteristics

引用本文:

冯华磊1，刘东明1，2，蔡国军1，3，段伟1，4. 基于CPTU测试的抗拔桩承载特性评价方法[J]. 岩石力学与工程学报, 2023, 42(S1): 3778-3791.
FENG Hualei1，LIU Dongming1，2，CAI Guojun1，3，DUAN Wei1，4. Evaluation method of bearing characteristics of uplift pile based on CPTU test. , 2023, 42(S1): 3778-3791.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0660 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3778

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