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了解打桩一段时间后的桩的承载力,对桩基设计是十分重要的。本文在粘性土和砂性土中,引出了时间函数的桩承载力的估算公式。在粘土中分别对打入3～5个星期的7根桩和打入4个月的1根桩进行承载力的变化分析,验证了在粘土中一定时间效应的估算承载力的公式。再对3个不同场地但同是非饱和砂土中的不同类型桩进行承载力分析,证实了承载力对时间的线性关系。另外,在某饱和砂土场地中5根桩的工程实例说明了确定承载力范围的非线性公式。这些公式可用于估算成桩长时间后桩的承载力,以选择打桩最后贯入度。
Understanding pile bearing capacity after piling for a period of time is very important for pile foundation design. In this paper, in clay and sand soil, leads to the time function of pile bearing capacity of the formula. In clay, the change of bearing capacity of 7 piles penetrated into 3 to 5 weeks and 1 pile into 4 months respectively was analyzed, and the formula of estimating bearing capacity of clay in certain time effect was verified. The bearing capacity of different types of piles in three different sites but in the same unsaturated sand was analyzed. The linear relationship between bearing capacity and time was confirmed. In addition, the engineering example of 5 piles in a saturated sand site shows the nonlinear formula for determining the range of bearing capacity. These formulas can be used to estimate the pile’s bearing capacity after a long period of pile driving, so as to select the final penetration of pile driving.