桩承式加筋路堤桩体荷载分担比计算

发布时间：2018-04-02 02:31

本文选题：路基工程　切入点：桩承式加筋路堤　出处：《岩石力学与工程学报》2017年S1期

【摘要】：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。
[Abstract]:In order to reflect the influence of layer distribution and strain difference of multi-layer reinforced material on pile-supported reinforced embankment, based on the assumption of soil arch shape and strain distribution of reinforced material, Based on the limit equilibrium theory and the assumption of concentric circular two-dimensional soil arch model, the calculation formula of load-sharing ratio of pile body on reinforcement is derived, and then the grid deformation between caps is assumed to be arc curve. Considering the contribution of the grid deformation on the cap to the grid strain between the caps, the calculation formula of the grid strain is derived, which is more suitable for the structural characteristics of the large pile cap with sparse piles. Furthermore, the additional stress of earth pressure and soil stress between piles is used to calculate the bottom grid deflection, and an arbitrary layer grid deflection expression with the bottom grid deflection as independent variable is proposed. Finally, according to the grid strain calculation of the grid tension and its vertical component, a formula for calculating the load-sharing ratio of the pile body under the bars considering the effect of the grid tension film transfer is obtained. This method can be applied to the single-layer and non-single-layer reinforced pile reinforced embankment. The calculated value is in good agreement with the measured value.
【作者单位】：同济大学道路与交通工程教育部重点实验室;广西交通投资集团有限公司;
【分类号】：U416.12

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