承重阻滑桩受力影响因素分析

Influencing Factors Analysis for Mechanical Behavior of Load-Bearing and Anti-slide Piles

承重阻滑桩在山区高速公路建设中应用广泛,具有承重与阻滑双层作用,其受力性状远比抗滑桩和平地上受荷桩复杂。基于p—y曲线法的有限差分解,对影响承重阻滑桩内力与位移的桩顶竖向荷载、桩自由长度、桩径(刚度)、滑坡推力大小、滑坡推力分布形式5个因素进行计算。通过对计算结果的分析探讨,得到一系列的结论对承重阻滑桩的实际应用有一定的指导作用。

Load-bearing and anti-slide piles have a popular application in the construction of freeway in mountainous area, it has double function： not only bearing the load from the superstructure but also counteracting landslide-thrust from the side of pile foundation, and the mechanical behavior of pile is much more complex than anti-slide pile or simplex inclined-loading pile. Adopting finite difference solution based on p - y curve method, five factors such as the vertical load on pile top,the free length of pile, the pile diameter （rigidity of pile） , the size of the landslide-thrust, the distribution of landslide-thrust which effecting the inner force and displacement of the load-bearing and anti-slide pile is calculated. Analyzing the calculation result, a series of conclusions is obtained, and it has certain guidance functions to engineering application for the load-bearing and anti-slide piles.