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文章通过对疏桩支撑路堤上部填土的力学分析,改进了既有桩土应力重分布解析模型,推导出新的地基顶面桩土应力比公式,充分考虑了路堤填料的粘聚力的影响,并对荷载转移中剪应力发挥程度系数进行了探讨。算例分析表明,桩土应力比受填土高度、填料强度(c、φ、E)、基底差异沉降、桩心距等因素的影响,其中,粘聚力的影响较为显著,不容忽视。
In this paper, by analyzing the mechanics analysis of embankment filling with sparse pile, the analytical model of stress distribution in existing pile-soil is improved and the formula of pile-soil stress ratio at the top of foundation is deduced. The effect of embankment filler cohesion is fully considered , And the coefficient of degree of shear stress exerted in load transfer was discussed. The case study shows that the stress of pile - soil is affected by the height of fill soil, the strength of filler (c, φ, E), the differential settlement of foundation and the distance between pile center and other factors. Among them, the influence of cohesion is significant and can not be neglected.