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将路堤填土和刚性桩复合地基加固区、下卧层作为一个整体考虑,取路堤中心处一单桩加固单元为研究对象,设定桩土荷载分担比和桩侧摩阻力分布形式初值,运用Mindlin和Boussinesq联合求解法计算内外土柱应力和沉降,根据路堤与复合地基表面交界处位移连续条件,迭代求得实际侧摩阻力分布。建立的复合地基的桩土荷载分担与桩土相互作用的耦合模型具有较严密的理论基础,解决了M&B联合求解法需要预先已知桩土应力比以及桩侧摩阻力分布形式的问题,计算得到的桩土荷载分担、桩土沉降与工程监测数据较为吻合,验证了模型的正确性。
Considering the embankment filling, the reinforcement zone and the sublayer of rigid pile composite foundation as a whole, taking the reinforcement of a single pile at the center of the embankment as the research object, the initial values of load-sharing ratio of pile-soil and pile-side frictional resistance are set. Applying Mindlin and Boussinesq joint solution to calculate the stress and settlement of soil column inside and outside, according to the continuous displacement conditions of the embankment and composite foundation surface, iteratively obtain the actual distribution of frictional resistance. The coupling model of pile-soil load sharing and pile-soil interaction in the composite foundation has a rigorous theoretical foundation, which solves the problem that the pre-known pile-soil stress ratio and pile-side frictional resistance distribution of M & B joint solution method are calculated, and the calculated Pile-soil load sharing, pile-soil settlement and engineering monitoring data are in good agreement to verify the correctness of the model.