高频液压振动锤沉桩引起的孔压增长性状分析

Behaviour analysis of excess pore pressure due to vibratory pile driving using the high frequency hydraulic vibratory hammer

考虑高频振动沉桩过程引起地基中超静孔隙水压力增长情况,研究了孔压沿桩径方向与轴向的大小及分布规律,并同时对高频振动沉桩引起的孔压性状的主要影响因素进行探讨。研究结果表明:打桩过程中超静孔隙水压力的增长性状对其打桩的可打入性有很大的影响,有地下水存在时,高频振动沉桩引起孔压的增加有利于桩的贯入,因而桩的贯入位移大幅度增加。

The numerical analysis were performed to study the developing behaviors of excess pore pressure during pile driving using high frequency hydraulic vibratory. The excess pore pressure behaviors varying along radial and shaft of a pile were analyzed. The results show that the excess pore pressure is helpful to pile divring and pile penetration speed increases with the increase of excess pore pressure.