高桩码头基桩竖向承载力原型试验研究

Research on bearing capacity prototype test of high-piled wharf piles

单桩承载力的检测已有较多成熟的方法。高桩码头的基桩作为整个高桩码头体系的一部分,上部存在复杂的结构,对于此类结构型式,现阶段尚没有有效的方法检测其承载力。结合实际工程,提出区域堆载法检测高桩码头现役基桩承载力的技术,该方法不破坏码头现有的结构。现场进行高桩码头基桩承载力原型试验,在分级荷载作用下测试码头整体变形变位、基桩沉降、结构构件应变等。同时建立数值模型,对高桩码头基桩承载力进行计算分析,利用试验结果对数值模型进行修正,用修正后的数学模型对原型试验的全过程进行数值模拟,对比分析数值计算与试验结果表明,两者吻合较好。经综合分析,最终确定高桩码头基桩的竖向承载力可以达到1 400kN,码头结构处于安全状态,其结果为码头改造的方案设计提供了试验依据。

There are many mature methods to detect the bearing capacity of single pile, but for high-piled wharf piles, as they are parts of high-piled wharf, and complex structures are built on them, at this stage, for these non-free end piles, there are no effective and feasible bearing capacity detection methods. In this paper, regional heap load method to detect high-piled wharf piles capacity is proposed, and this method doesn’t destroy the original structure. The high-piled wharf piles capacity prototype testing is carried out, and the deformation displacement of while high-piled wharf, the displacement of piles, and the strain of structural elements are tested under grading loads. Also the numerical model is established to analysis the bearing capacity of high-piled wharf piles, and the numerical model is corrected by the experimental results, then the whole prototype test process is simulated using the modified mathematical model. The comparison between the numerical results and the experiment data shows a satisfactory agreement. Through comprehensive analysis, the vertical bearing capacity of high-piled wharf piles is finally determined as 1 400 kN, which could ensure the safety of the high-piled wharf, and the study results could provide experimental basis for the design of the wharf.