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为反映多层加筋材料分布层位和应变差异对桩承式加筋路堤的影响,基于土拱形态和筋材应变分布的假设,推导桩土荷载分担比的计算公式。首先根据极限平衡理论和同心圆二维土拱模型假设,推导筋上桩体荷载分担比的计算公式;再假设帽间格栅变形为圆弧曲线,考虑帽上格栅变形对帽间格栅应变的贡献,推导更符合常用大桩帽疏桩结构特点的格栅应变计算公式;进一步以筋下填土产生的土压力和桩间土应力为附加应力计算底层格栅挠度,提出以底层格栅挠度为自变量的任意层格栅挠度表达式;最终依据格栅应变计算格栅拉力及其竖向分量,得到考虑格栅拉膜传荷作用的筋下桩体荷载分担比计算公式。该方法可适用于单层以及非单层加筋的桩承式加筋路堤,经工程实例验证,计算值与实测值吻合较好。
In order to reflect the influence of layers and strain difference of multi-layer reinforced material on pile-supported stiffened embankment, a formula to calculate load-sharing ratio of pile-soil is derived based on the assumption of arching shape and strain distribution. First, according to the limit equilibrium theory and concentric two-dimensional soil arching hypothesis, the formula for calculating the load-sharing ratio of the pile on the tendon is deduced. Suppose the deformation of the cavern is a circular arc curve, Strain contribution and derive a formula of grid strain that is more in line with the characteristics of commonly used pile caps and sparse piles. Calculating the deflection of the bottom grid further by the earth pressure generated by the earth fill and the additional stress between the soil layers, And the grid deflection is an independent variable. Finally, according to the grid strain, the grid tensile force and its vertical component are calculated, and the formula for calculating the load sharing ratio of the pile under the rib load transfer is obtained. The method can be applied to single-ply and non-single-ply reinforced piled reinforced embankment, verified by the engineering example, the calculated value is in good agreement with the measured value.