Abstract
In ocean engineering, pile sliding often occurs in the driving process of large-diameter pipe piles and will affect the engineering quality, so accurate pile sliding interval is necessary. According to the stress situation of steel pipe pile out of actual engineering, the causes of pile sliding are analysed. Using the static equilibrium equation, the mud depth at which the pipe pile may slip is calculated. The influence of pile siding friction was considered when calculating the second pile sliding, and the pile siding friction is divided into three influential areas. Using integrating method, the work done by pile resistance is calculated. Combined with the working principle and power principle, the energy transformation equation of the pipe pile in the process of sliding is obtained, and the sliding length and interval of the pile are calculated. A comparison between the measured results and the real case calculation was conducted using this new method. The comparison indicated that the total relative errors in pile sliding interval are 8% to 16%, and the new method has high accuracy. The results of the new method are in accord with the measured data, which can provide a reference for predicting the interval of pile sliding in the project.
Highlights
As a structure providing production and living facilities, the offshore platform integrates drilling, transportation, construction, observation, and navigation
The pile foundation construction usually uses large-diameter and super-long steel pipe piles, and the pipe piles are driven into the seabed soil layer along the pipe by a hydraulic piling hammer
The reasons for the sliding of large-diameter steel pipe piles of the offshore platform are analysed, and the relationship between the ultimate bearing capacity of the foundation and the pile ends resistance is calculated by considering the influence of sliding piles of the pile side friction resistance of different depths
Summary
As a structure providing production and living facilities, the offshore platform integrates drilling, transportation, construction, observation, and navigation. Yin [7] analysed the pile sliding mechanism for large-diameter steel pipe piles and proposed the calculation method of pile sliding length. Most of the above studies were carried out for the reduction of pile side friction and calculation of pile sliding length in the process of steel pipe pile sliding, seldom considering the change of pile side friction at different depths in the process of pile sliding, and no different calculation methods were adopted for the actual engineering situation. The reasons for the sliding of large-diameter steel pipe piles of the offshore platform are analysed, and the relationship between the ultimate bearing capacity of the foundation and the pile ends resistance is calculated by considering the influence of sliding piles of the pile side friction resistance of different depths. A new algorithm for the sliding interval of large-diameter steeled pipe piles is established by using the static balance and function principle, and the rationality and reliability of the algorithm are verified through the comparative analysis of engineering examples
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