有关单桩竖向抗压承载力的几个概念辨析

Some concepts about vertical compressive bearing capacity of single pile

分析总结了单桩承载力极限标准值、标准值、特征值、设计值及基本值等名词术语之间的复杂关系,阐明了这些名词术语的概念及在相关规范中的取舍原因。得到的结论有:可暂停使用"桩端阻力特征值"及"桩侧阻力特征值";以后时机成熟时,可恢复使用承载力基本值及设计值名词、"承载力特征值"可修改为"承载力设计值"、"极限标准值"可去除"极限"两字;基础规范及桩基规范用于计算单桩承载力的公式从概念角度理解都存在着不完善之处,后者相对更直接、更可靠一些。

The complex relations between some nouns and terms about the bearing capacity of single pile, such as the ultimate standard value, standard value, characteristic value, design value, basic value and so on, are systematically summarized, and the concepts, naming and abolishing reasons of these nouns and terms in codes are clarified. The conclusions are as follows:(1) the nouns of the characteristic values of pile shaft resistance and pile tip resistance can be abandoned temporarily;(2) when the time is right, the nouns of basic value and design value of bearing capacity can be used again, the characteristic value of the bearing capacity can be modified to the design value of the bearing capacity, and the word the ultimate can be wiped from the noun of the ultimate standard value;(3) there are some theoretical disadvantages of formulas for calculating the bearing capacity of single pile in the foundation code and pile code, and the latter is relatively more direct and more reliable.