浅议桩基承载力计算公式

Discussions on the Pile Axial Capacity Estimation Formulas

通过对试验桩基的受力传递机理分析,认为单桩承载力特征值计算公式中桩端阻力、侧摩阻力特征值分别取其极限值除以安全系数2不符合实际受力情况,应分别采用不同的安全系数计算其特征值,但目前对其研究还不够成熟,桩基承载力按照极限值除以综合安全系数计算更为合适。

The load transfer mechanism in an axial loaded pile is studied through the static loading tests on instrumented piles. In the allowable axial capacity estimation formula, the allowable capacity is obtained by using the limiting values of shaft and tip resistance divided by an uniform factor of safety of 2. This approach is not consistent with the actual load transfer mechanism. The ideal pile allowable capacity should be obtained by the limiting values divided by different safety factors. However, at cur rent stage, it is appropriate to use one comprehensive safety factor to obtain the allowable pile capacity since the load transfer mechanism between the pile shaft and the tip are not clear.