侧向堆载下高低承台桩受力性状的对比研究

Comparative Analysis on Mechanical Properties of the Pile with High-low Bearing Platform Under Lateral Loads

为深入认识滨海地区侧向堆载下高低承台桩的受力特征,运用岩土三维有限差分软件FLAC3D进行数值分析,考虑了不同堆载距离和堆载高度等条件下高承台桩以及低承台桩的受力性状,对比了两者在侧向堆载作用下的位移、弯矩和轴力。分析表明:在滨海地区,侧向堆载下低承台桩身的桩顶水平位移反应较高承台敏感;高承台桩身内力受影响程度明显大于低承台桩。因此,对于高低承台桩基础的选择应该考虑各方面的因素,做到安全经济。其结论对滨海区的桩基础的设计与施工具有一定的参考价值。

In order to deeply understand the mechanical properties of the pile with high-low bearing platform under lateral loads in the coastal area,the numerical analysis was carried out by using the three dimensional finite difference software FLAC3 D,the stress characteristics of pile with high-low bearing platform under different loading distance and pile height were considered,the displacement,bending moment and axial force of the two under lateral loads were compared. Analysis showed that in the coastal area,the pile top horizontal displacement response of the low bearing platform pile under lateral loads was more sensitive to that of the high pile cap,the internal force of pile with high bearing platform was significantly higher than that of low bearing platform pile. Consequently,for the selection of high-low bearing platform pile foundation,it should consider various factors to ensure the security and economy. The conclusion had a certain reference value for the design and construction of the pile foundation in the coastal area.