抗拔桩荷载-位移曲线的归一化

Normalization of Load-Displacement Curves of Tension Piles

抗拔桩常被应用于地下构筑物的抗浮和受较大弯矩作用高耸构筑物的基础.相对于抗压桩而言,国内对抗拔桩变形分析方法的研究较少,且大多数已有分析方法都过于复杂,不便于实际工程应用.文中通过选择合适的标准化参数将毫无规律的抗拔桩荷载-位移曲线族归一化为单一曲线,然后利用回归公式拟合该曲线,并将回归公式扩展到层状土体中.通过模型试验和现场试桩试验结果的比较可以看出,文中提出的简化方法不但可以简化抗拔桩的变形计算,而且计算结果与实测结果也较为吻合.

Tension piles are widely employed to resist the uplift loads of underground structures and commonly used as the foundations of tall buildings subjected to high bending moments. However, as compared with compressive piles, tension piles are seldom studied in the aspect of deformation, and most of existing methods are too complex to be applied to practical projects. In order to solve this problem, some normalizing parameters are selected to normalize different load-displacement curves to a single, which is then fitted by using a regression formula that is expanded to the condition of layered soil. By comparing modeling results with the field ones, it is found that the proposed method simplifies the calculation of deformation of tension piles with reasonable results.