软土地区桥梁桩基础基于经济性的精细化设计方法探讨

Exploration of Economic Refined Design Method for Bridge Pile Foundations in Soft Soil Regions

为了在设计阶段充分发挥桥梁桩基础的经济效益,以软土地区钻孔灌注桩承载力计算的理论基础为出发点,提出“单位体积桩基础混凝土量能提供的竖向承载力”指标。通过进一步理论公式推导,对影响桩基经济性的指标变化规律进行多维度分析与总结,为工程实践中进一步优化桩基经济性能的设计方法提供参考。通过分析钻孔灌注桩的桩径、桩长在不同土层特性中对桩基承载力的贡献比例及参数变化敏感性,可得到桩基更加经济高效的调整方向,并可结合当地综合单价进一步修正,以指导桩基设计与选型,发挥较高的经济效益。

In order to fully leverage the economic benefits of bridge pile foundations during the design phase,starting from the theoretical basis of calculating the bearing capacity of drilled cast-in-place piles in soft soil areas,the index of vertical bearing capacity provided by the concrete volume of unit volume pile foundation is proposed.Through further theoretical formula derivation,multi-dimensional analysis and summary of the changes in indicators that affect the economic performance of pile foundations are conducted,providing reference for further optimizing the design methods of pile foundation economic performance in engineering practice.By analyzing the contribution ratio and parameter sensitivity of the diameter and length of drilled cast-in-place piles to the bearing capacity of pile foundations in different soil layers,a more economical and efficient adjustment direction for pile foundations can be obtained,and further correction can be made based on local comprehensive unit prices to guide pile foundation design and selection,and to achieve high economic benefits.