波速孔压静力触探试验在桩基工程中的应用研究

根据波速孔压静力触探探头和静压桩在软粘土中贯入的特点,基于小孔扩张理论、一维固结理论和有效应力原理,建立了以波速孔压静力触探试验参数计算软土中单桩的桩侧承载力极限值、桩侧承载力时效性以及沉桩瞬间桩周土中的超静孔隙水压力的理论解。以昆山某试验场地的现场试验值与相应的理论计算值进行对比,结果显示两者非常吻合,说明波速孔压静力触探试验在桩基工程中具有广泛的应用价值。

Study on the application of seismic piezocone penetration tests in pile foundation engineering

According to the penetrating characteristics of the seismic piezocone penetration tests （SCPTu） and the jacked piles, the theoretical relationship on the ultimate bearing capacity of single pile, the time- effect of shaft bearing capacity of single pile, the excess pore water pressures around piles during pile driving and the data measured from SCPTu is developed based on the cavity expanded theory, the Terzaghi one-dimensional consolidation theory and the effective stress theory. The results from field tests in Kunshan and the calculated results from the theoretical relationship mentioned above are compared. The results indicate that the analytical solutions agree well with that from the in-situ tests, which show that the applications of seismic piezocone penetration tests will be wide in the field of pile foundation.