论文部分内容阅读
根据地震场地液化特征,将土层分为表层非液化层,中部液化层以及底部基础层,基于桩-土相互作用的Winkler模型,得到考虑轴力作用的液化土层中桩-土系统的频率方程。利用此频率方程,研究了液化土层中轴压单桩的稳定性问题,分析了各种参数对受压桩临界载荷的影响。数值结果表明:桩临界荷载与抗弯刚度成正比;液化初期时,随着液化土层厚度的增加,桩临界荷载降低迅速,但当液化土层达到一定厚度后,液化土层厚度对临界载荷的影响很小;相比于基层土层,液化土层刚度折减系数将显著降低桩的临界载荷。这些结果可为桩基础设计提供的一定参考。
According to the liquefaction characteristics of the earthquake site, the soil is divided into surface non-liquefaction layer, middle liquefaction layer and bottom foundation layer. Based on the Winkler model of pile-soil interaction, the frequency of pile-soil system in the liquefied soil layer considering axial force equation. Using this frequency equation, the stability of axially piled single pile in liquefied soil is studied, and the influence of various parameters on the critical load of piled piles is analyzed. The numerical results show that the critical load of pile is directly proportional to the bending stiffness. At the initial stage of liquefaction, the critical load of pile decreases rapidly with the increase of the thickness of liquefied soil. However, when the thickness of liquefied soil reaches a certain thickness, Has a small effect on the soil; the stiffness reduction coefficient of the liquefied soil layer will significantly reduce the critical load of the pile compared with the soil layer of the grassroots. These results can provide some reference for the design of pile foundation.