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针对我国大型深水港口工程及跨海大桥工程中大直径钢管桩的承载力特性研究较少的问题,以湛江某集装箱码头中的大直径钢管测试桩A为例,通过对数值计算与现场静载试验数据的对比分析,确定了ABAQUS有限元软件对大直径钢管桩承载力数值模拟的有效性,表明该软件能对大直径钢管桩承载力特性进行定性和定量分析,继而分析了竖向荷载作用下大直径钢管桩尺度(桩径和桩长)对其承载力特性的影响。结果表明,随钢管桩桩径的增大,其极限承载力和桩侧摩阻力随之提高,桩端阻力随之减小,桩端沉降与桩顶沉降之比亦逐渐减小;随桩长的增加,钢管桩的极限承载力和桩侧摩阻力均显著提高,但桩端阻力与桩顶荷载之比逐渐减小,因此在设计中应选取合适的桩长并以桩身变形作为控制参数。
Aiming at the problem that the research on the bearing capacity characteristics of large diameter steel pipe pile in China’s large-scale deep-water port project and across-the-sea bridge project is relatively few, taking the large diameter steel pipe test pile A in a container terminal of Zhanjiang as an example, The results of numerical simulation of ABAQUS finite element software on the bearing capacity of large diameter steel pipe pile indicate that the software can qualitatively and quantitatively analyze the bearing capacity of large diameter steel pipe pile, and then analyze the vertical Influence of Large Diameter Steel Pipe Pile Sizes (Pile Diameter and Pile Length) on Its Bearing Capacity under Load. The results show that with the increase of pile diameter, the ultimate bearing capacity and lateral friction of pile increase with the decrease of pile end resistance and the ratio of settlement of pile head to settlement of pile top. When the length increases, the ultimate bearing capacity of steel pipe pile and the frictional resistance of pile side are significantly increased, but the ratio of pile end resistance and pile top load decreases gradually. Therefore, appropriate pile length should be selected and the pile deformation should be taken as Control parameters.