| 黏土中桩靴底部吸附力产生机理研究 |
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| 引用本文： | 闫国斌,潘池,李飒,尹蒋松,李婷婷.黏土中桩靴底部吸附力产生机理研究[J].海洋工程,2022,40(5):57-67. |
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| 作者姓名： | 闫国斌 潘池 李飒 尹蒋松 李婷婷 |
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| 作者单位： | 天津大学 建筑工程学院岩土所, 天津 300350 |
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| 基金项目： | 国家自然科学基金重大项目(51890911) |
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| 摘 要： | 在海洋工程中，移动钻井平台在作业结束后需要转场时，经常会遇到拔桩困难的问题，桩靴底部的吸附力是上拔力的重要组成部分，明确其产生机理及发展规律对于上拔力计算与缓解上拔困难问题有重要意义。通过室内模型试验研究了黏土中桩靴底部真空度对桩靴吸附力产生机理的影响，试验结果表明，桩靴底部真空度的变化对上拔力的影响显著，而桩靴贯入深度和上拔速率会对真空度产生影响。当真空度达到峰值时，桩靴底部吸附力与上拔力几乎同时达到峰值，因此可以通过减小桩靴底部真空度的措施来减小上拔力。根据试验结果,提出了运用真空吸盘理论来计算桩靴底部吸附力的计算公式。所述吸附力计算方法与试验结果进行对比，其误差较小，对工程实践具有一定的参考意义。
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| 关 键 词： | 桩靴 黏土 真空吸盘 真空度 吸附力 |
| 收稿时间： | 2021/9/22 0:00:00 |
Analysis on mechanism of breakout force of spudcan in clay |
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| YAN Guobin,PAN Chi,LI S,YIN Jiangsong,LI Tingting.Analysis on mechanism of breakout force of spudcan in clay[J].Ocean Engineering,2022,40(5):57-67. |
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| Authors: | YAN Guobin PAN Chi LI S YIN Jiangsong LI Tingting |
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| Institution: | Geotechnical Institute, Civil Engineering Department, Tianjin University, Tianjin 300350, China |
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| Abstract: | In offshore engineering, for jack up drilling platform, the difficulty of pulling up a spudcan is a problem that is widely concerned. Because it is important to understand the mechanism and development law of breakout force of a spudcan in clay, model teats were done to study this problem in this paper. The test results show that the vacuum degree at the bottom of spudcan in clay could play an important role in a spudcan pulling out. The penetration depth and the pulling rate of the spudcan have an impact on the vacuum degree, and the uplift force and vacuum degree almost reaches the peak at the same time. Therefore, the efficiency of a spudcan pulling could be improved by reducing the vacuum degree at the bottom of the spudcan. According to the test results, a method for calculating the breakout force at the bottom of the spudcan using the vacuum sucker theory is proposed. The calculation results from the method proposed in this paper is compared with that from experimental results, and they are basically consistent. It could be helpful for calculating breakout force in practice. |
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| Keywords: | spudcan clay vacuum suction cup vacuum breakout force |
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