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本文通过砂土中微型桩侧向受荷室内足尺模型试验,获得了微型桩在侧向受荷时不同深度处桩身位移、弯矩和桩周土反力,研究了微型桩的变形和受力特性。在试验基础上,利用三维有限元方法建立了微型桩-土互相作用模型,针对桩径从0.1 m到0.2 m的微型桩p-y曲线进行分析,并与常用的Reese法和API法的进行比较,发现常用的Reese法和API规范的p-y曲线的初始刚度偏大及桩周土极限抗力偏小。最后,在试验及三维有限元模型的基础上研究了微型桩-土p-y曲线沿深度变化的分布特性,提出了适用于砂土中微型桩的双曲线型p-y曲线。
In this paper, through the full-scale lateral lateral model test of miniature piles in sand soil, the displacements and bending moments of piles and the soil reaction forces at different depths are obtained. Force characteristics. On the basis of experiments, the micro-pile-soil interaction model was established by using the three-dimensional finite element method. The py curve of micro-pile with pile diameter from 0.1 m to 0.2 m was analyzed and compared with the commonly used Reese method and API method. It is found that the initial stiffness of the py curve of the commonly used Reese method and API specification is too large and the local resistance of the soil around the pile is too small. Finally, based on the experiment and the three-dimensional finite element model, the distribution characteristics of the p-y curve along the depth of the micropile-soil curve are studied. The hyperbolic p-y curve suitable for the micropile in the sand is proposed.