基于超静孔压消散的静压桩极限承载力研究

Study on ultimate bearing capacity of static pressed pile based on excess pore water pressure dissipation

预制桩承载力的时间效应是岩土工程中一个重要的课题。基于饱和软土中静压桩单桩引起的三维超静孔隙水压力的消散和桩周土的固结,考虑桩土接触面的破坏形式,获得了估算考虑时间效应的单桩极限承载力的解析解。分析表明,在饱和软土中静压预制桩单桩在50d时的极限承载力可达到最终极限承载力的70%左右。最后,通过2个工程实例验证了该方法的可行性。

Based on dissipation of 3-D excess pore water pressure due to static pressed pile in soft clay, consolidation of the clay around the pile and failure model of pile-soil interface, an analytical solution to estimate time-depended ultimate bearing capacity of the static pressed pile was obtained. To static pressed pile in soft clay, the presnted solution shows that the ultimate bearing capacity of 50d may reach 70% that of the final capacity. Results from the presented solution are in agreement with site tests.