自升式钻井平台插桩等候时间与拔桩阻力相互影响研究

Study on the Mutual Influence between the Waiting Time of Pile Insertion and the Pull-out Resistance of Jack-up Platform

王金明

WANG Jinming

中海油能源发展股份有限公司工程技术分公司, 天津 300452

CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China

自升式钻井平台现场作业时可能会出现拔桩困难、周期长等问题，为了提高拔桩效率，对拔桩阻力与插桩等候时间之间的相互影响关系进行了试验研究。以“海洋石油941”平台桩腿和桩靴为原型，选取渤海湾天津海边原状土为试验场地，进行了相关试验。结果表明，拔桩阻力随等候时间的增加而增加，且增加的幅度越来越小，最终趋于稳定；在不考虑拔桩前用高压海水对桩靴上下表面土体冲桩的情况下，当拔桩阻力稳定时，拔桩阻力约为桩腿自重的2倍。

Some problems such as the difficulty in pile pull-out and operation cycle prolonging may occur in the field operation of the jack-up platform. In order to improve the efficiency of pile pull-out, the author conducted the experimental study on the relationship between the pull-out resistance and the waiting time of pile insertion. The experiments were made by taking Marine Oil 941's leg and spudcan as the sample, the undisturbed soil of Bohai Bay in Tianjin as the experimental site. The results show that the of pullout resistance increases with the increase of waiting time, the increment becomes gradually smaller, and eventually tends to be stable. Without regard to the influence of water jetting of high pressure sea water on the upper and lower surface soil of the spudcan before pulling out the pile, the pull-out force is about 2 times of the weight of the leg when the pull-out resistance is stable.

https://doi.org/10.3969/j.issn.1008-2336.2016.02.090