抗拔桩变形的弹塑性解析计算

随着城市建设的迅猛发展,抗拔桩作为抗浮基础的主要形式在工程中应用十分广泛。然而国内关于抗拔桩的研究较少,且大部分集中在抗拔桩的承载力方面,对抗拔桩变形分析方法的研究相当有限。在假定桩侧土体荷载传递曲线(p-w曲线)满足理想弹塑性关系、桩侧土体强度随深度为常数或呈线性增长的基础上,推导出计算抗拔桩轴力和变形的弹塑性解析的表达式。通过与模型试验和现场试桩试验结果进行对比表明,该方法能较好地预测抗拔桩的非线性变形,理论预测结果与实测结果是比较吻合的。

AN ELASTIC-PLASTIC ANALYTICAL CALCULATION OF DEFORMATION OF THE TENSION PILES

With the development of urban construction, tension piles are widely used for resisting uplift loads of underground structures. However, there are few research achievements of tension piles. Most of study achievements of tension piles are centralized at the uplift capacity, but the study on analytic methods of the deformation of tension piles is very few. The elastic-plastic load-transfer functions of pile shaft are adopted in the analysis of deformation of tension piles. The lateral soil strength is regarded as constant or increasing linearly along the depth. On this basis, a series of expressions of deformation and the value of the axial load at a certain depth from the ground surface of tension pile are deduced. The comparison of the load-settlement responses of the model experiment to the results of shows that this method can predict well the nonlinear deformation of the tension piles.