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为提高水平承载能力,深水桥梁的钻孔灌注桩成桩后保留了施工时的钢护筒,形成混合桩。混合桩已用于工程实践,但对其水平承载性能缺乏系统研究。本文考虑混合桩的结构特点,采用有限元方法进行数值模拟,分析了含钢率、泥皮的弹性模量及泥皮厚度等因素对其水平抗弯刚度的影响。根据数值模拟的结果,进行多元线性回归拟合分析,得出了混合桩水平抗弯刚度的数学计算模型。
In order to improve the horizontal bearing capacity, the cast-in-place piles of deep-water bridges have retained the steel casing during construction to form mixing piles. Mixing piles have been used in engineering practice, but there is a lack of systematic research on their horizontal bearing properties. In this paper, considering the structural characteristics of the mixing pile, the numerical simulation was carried out using the finite element method. The effects of the steel rate, the elastic modulus of the mud and the thickness of the clay skin on the horizontal bending stiffness of the pile were analyzed. According to the results of numerical simulation, a multivariate linear regression fitting analysis was performed, and the mathematical calculation model of the horizontal bending stiffness of the mixed pile was obtained.