Abstract:Due to the harsh environmental conditions in ocean engineering,intermissions occur during the driving of large diameter and deep penetration piles,which may cause difficulties,even refusal,in re-starting the pile. Analytical results show that soil strength recovering is influenced by the soil stratum distribution,the crack development around the pile,the cessation time of driving and the soil plug effect in the pile pipe. A calculation method is proposed to identify the developed excess pore water pressure and its time effects in the soil around the pile during driving. Based on the driving records,the back-figured method is applied to estimate the pile bearing capacity after refusal taking place. The calculated results agree well with the in-situ observed data,which indicates that the proposed back-figured procedure can be used in similar pile driving situations.