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静力触探原位试验法确定单桩承载力,主要用于混凝土预制桩,而钢管桩的挤土效应较小,还具有土塞效应问题。针对这些特点,在国外已建立的ICP和UWA等设计方法的基础上还提出了HKU设计方法。这3种方法具有类似的理论背景,且都利用静力触探锥尖阻力分别计算端阻和侧阻。尽管如此,在预测原型试桩承载力时3种方法的计算值差别较大。其不同点在于:端阻力计算中对管壁和土塞部分是否分别考虑;对桩端承载影响区的理解;对侧阻疲劳退化的考虑;以及如何利用土塞指标考虑闭塞程度和沉桩挤土效应的影响。
Static penetration test in-situ method to determine the bearing capacity of single pile, mainly for precast concrete piles, and steel pipe pile squeezing effect is small, but also has the plug effect. In view of these characteristics, based on the established ICP and UWA design methods abroad, the design method of HKU is also proposed. These three methods have a similar theoretical background, and both use end-cone resistance to calculate end and side resistance respectively. Nevertheless, the calculated values of the three methods vary greatly in predicting the bearing capacity of the prototype test pile. The differences lie in the following aspects: whether the pipe wall and the soil plug are separately considered in the calculation of the end resistance; the understanding of the influence zone of the pile-end bearing; the consideration of the resistance degradation of the contralateral side; and the consideration of the degree of occlusion and pile- Effect of soil effect.