海上风机吸力式桶形基础贯入试验模型的研究

发布时间：2018-10-13 18:52

【摘要】：吸力锚是现今海洋工程中被广泛采用的一种新型的基础形式。其沉贯能力和沉放施工就位效果是承载力和正常使用功能的重要保证。国内外学者对于吸力锚的垂直贯入进行了很多模型试验及数值模拟的研究,但对倾斜贯入的研究相对较少。本文分析了砂土地基吸力贯入过程中吸力大小、初始入土深度对沉贯效果的影响,得到了负压与沉贯速度及初始入土深度与沉贯速度的关系。在倾斜贯入试验中,得到了负压、初始入土深度及初始倾角对沉贯速度和沉贯就位的影响。通过试验现象的观察,分析了土塞和水塞的发展情况。静力贯入与吸力贯入的对比试验及孔压数据的分析,表明负压引起的渗流显著降低了贯入阻力。
[Abstract]:Suction anchor is a new type of foundation widely used in ocean engineering. The sinking capacity and the effect of sinking construction are the important guarantee of bearing capacity and normal function. Scholars at home and abroad have done a lot of model tests and numerical simulation on the vertical penetration of suction anchors, but the research on oblique penetration is relatively rare. In this paper, the influence of suction and initial penetration depth on the penetration effect of sand foundation is analyzed, and the relationship between negative pressure and penetration velocity and between initial penetration depth and penetration velocity is obtained. The effects of negative pressure, initial penetration depth and initial dip angle on the penetration velocity and penetration position were obtained in the oblique penetration test. Through the observation of experimental phenomena, the development of soil plug and water plug is analyzed. The comparative test of static penetration and suction penetration and the analysis of pore pressure data show that the seepage induced by negative pressure can significantly reduce the penetration resistance.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU476

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