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为全面考虑路堤荷载下搅拌桩复合地基的桩土非等应变特性,将路堤、桩体、桩间土及下卧土层整体考虑,在总结前人试验结果基础上提出简化的桩土应力比和桩土差异沉降两阶段模型,改进了现有的桩顶平面处的桩土应力比计算方法。根据实际的应力状态计算桩侧摩阻力,计算桩土荷载分担,进而得到桩体和桩间土沉降。通过各子系统界面处的位移和应力边界条件考虑其相互作用,得到了路堤荷载下搅拌桩复合地基总沉降计算模型。对比淮盐高速公路试验段搅拌桩复合地基的实测沉降、文中模型以及传统复合模量法计算结果,验证了该模型的正确性,结果表明模型计算沉降与实测数据吻合,较常规的复合模量法计算结果更接近实测值。
In order to fully consider the non-equal strain characteristics of pile-soil under mixed embankment load, considering embankment, pile body, soil between piles and soil layer as a whole, based on the conclusion of previous test results, a simplified pile-soil stress ratio And pile-soil differential settlement two-stage model to improve the existing pile top plane pile-soil stress ratio calculation method. According to the actual stress state, the friction on pile side is calculated and the load sharing of pile-soil is calculated, and then the settlement of soil between pile and pile is obtained. Through the interaction of the displacement and stress boundary conditions at the interface of each subsystem, the calculation model of the total settlement of composite foundation with mixing pile under embankment load is obtained. Comparing the measured subsidence of the mixing pile composite foundation in the experimental section of Huai-Yan Expressway, the model in the paper and the calculation results of the traditional composite modulus method, the correctness of the model is verified. The results show that the calculated settlement of the model agrees well with the measured data, The result of the method is closer to the measured value.