上海某工程桩基勘察与静载试验对比及承载力参数优化

Comparison of Pile Foundation Investigation and Static Load Test and Optimization of Bearing Capacity Parameters for a Project in Shanghai

摘要:

对上海市三林滨江南片区7个工程项目的勘察报告与后期收集到的基桩静载试验报告进行对比分析，发现受检基桩承载力发挥不充分、设计参数过于保守。为探索更优的桩基承载力设计参数，对完成静载荷试验的基桩分别用A、B、C三种方法计算单桩承载力，将3种计算结果对比分析发现：B方法、C方法相对A方法抗压桩承载力分别提高13.8%~26.8%、28.9%~64.1%，B方法、C方法相对A方法抗拔桩承载力分别提高4.8%~19.6%、23.2%~38.3%；可见在安全可靠的前提下B、C方法比A方法在经济适宜性具有显著提高，建议勘察设计时优先采用C方法、其次采用B方法。该分析方法和结论可用于指导同类地质条件下勘察工作中确定桩基承载力设计参数的依据。

Abstract:

By comparing and analyzing the investigation reports of 7 engineering projects in the Sanlin Binjiang South Area of Shanghai with the static load test reports of foundation piles collected later, it is found that the bearing capacity of the inspected foundation piles is not fully utilized and the design parameters are too conservative. In order to explore better design parameters of pile foundation bearing capacity, the single-pile bearing capacity of the foundation piles that have completed the static load test is calculated by methods A, B and C respectively. A comparative analysis of the three calculation results reveals that the bearing capacity of compressive piles by Method B and Method C is increased by 13.8%~26.8% and 28.9%~64.1% respectively compared with Method A. The pull-out pile bearing capacity of Method B and Method C is increased by 4.8%~19.6% and 23.2%~38.3% respectively compared with Method A. It can be seen that under the premise of safety and reliability, Method B and Method C have significantly improved economic suitability compared with Method A. It is suggested that Method C is preferred in investigation design, followed by Method B. The analysis method and conclusion can be used as the basis to determine the design parameters of pile foundation bearing capacity in investigation under similar geological conditions.