静压桩极限承载力的时效分析

Analysis on Time Limitation of the Ultimate Bearing Capacity of Jacked Pile

通过隔时复压等试验表明,静压桩的极限承载力随时间呈双曲线增大。静压桩时效性机理主要是触变恢复效应和固结效应。引入时间参数分析在粘土中沉桩时所引起的超静孔隙水压力,给出了考虑固结效应的超静孔隙水压力的解。考虑不确定性和模糊性的特点,根据静压桩的压桩力,推算桩的极限承载力,并给出了一种计算方法。

The ultimate bearing capacity of jacked pile increases with the time in hyperbolically pattern. The mechanism of time effect can be interpreted as the effect of disturb-restore property and the effect of consolidation of the soil around the pile. Time is adopted to analyze excess pore water pressure due to driven pile in clay; and a formula is derived. According to the original construction force and considering fuzzy and uncertain, we can calculate the final bearing capacity of the pile. Acalculating method is given.