基于有限差分法的h型抗滑桩结构计算模型

Structural Calculation Model of h-type Anti-sliding Pile Based on Finite Different Method

目前关于h型抗滑桩的结构计算尚无成熟的模型和方法。提出基于有限差分法的h型抗滑桩结构计算模型,把h型桩分成滑动面以下和以上两部分分别建立差分方程,以边界条件为基础,推演出适用于h型抗滑桩计算的有限差分方程组,并进行计算分析。同时,进行h型抗滑桩大型结构模型试验,验证对比了有效差分分析方法。结果表明:采用有限差分法得到的h型抗滑桩关键点的位移和应力数据与结构模型试验结果基本吻合,说明采用有限差分求解h型抗滑桩的位移、应力等桩身参数具有较高的准确性和可靠度;h型抗滑桩前、后排桩的桩身应力均呈交变状态,有效降低了桩的最大应力值,克服了传统单排桩桩身应力过于集中的问题;h型抗滑桩前排桩和后排桩在同一高度上的桩身位移基本相等,具有较优的结构协同工作能力。

There are few mature models or methods for structural calculation of h-type pile cur rently. This paper introduces a new method to calculate the structure of h-type anti-slide pile based on finite different method（FEM）. The h-type pile was divided into two different parts to establish difference equation in light of the location of potential slip surface. The Finite difference equations set for h-type anti-slide pile was deduced and calculated based on boundary condition. The structural model tests were carried out to check the effectiveness of the calculation method based on FEM. Research shows that the values of displacement and stress calculated by FEM at same position are in agreement well with that from structural model test, which shows that the method of FEM in solving paramters of anti-sliding pile, such as displacement and stress, is ac- crate and reliable. At the sametime, the h-type anti-slide pile overcomes the problem of stress concentration compared with traditional anti-slide pile, because the alternating stress of front row pile and back pile of h-type pile can reduce maximum stress of pile effectively, Finally the dis- placements at the same height of front row pile and back row pile of h-type pile are almost same, which shows that h-type pile has an outstanding ability of work in coordination.