首先通过模型试验,探讨筒体内土体渗流对吸力的影响,并建立一个连接临界吸力与下沉深度的数学模型,深入分析单筒基础在不同下沉深度时所需的最小临界吸力。接着,在单筒基础研究成果的基础上,进一步开展四筒基础沉贯阻力的测试与分析工作。研究发现,随着筒型基础的下沉,其内部土体会经历一个吸力衰减的过程,且这种衰减程度与下沉深度之间存在线性关系。在整个下沉过程中,筒形结构将持续遭受吸力损失。基于上述观察结果,构建水力梯度与入土深度之间的关系模型,并推导出内外渗透系数比值随下沉深度变化的数学表达式。最后,通过对四筒基础进行吸力沉放试验,提出一种新的计算方法来确定筒型基础的临界最小吸力,并通过试验证明该方法的有效性。
Abstract
The effect of soil seepage in the bucket on suction was first explored through model tests, and a mathematical model connecting critical suction and penetration depth was establishcd, and the minimum critical suction required for a single bucket foundation at different penetration depths was analyzed in depth. Then, based on the research results of the single bucket foundation, the test and analysis of the penetration resistance of the four-bucket foundation were further carried out. The study found that as the bucket foundation penetrates, the soil inside it will experience a suction attenuation process, and there is a linear relationship between the degree of attenuation and the penetration depth. During the entire penetration process, the bucket structure will continue to suffer from suction loss. Based on the above observations, a relationship model between hydraulic gradient and soil penetration depth was constructed, and a mathematical expression for the ratio of internal and external permeability coefficients with penetration depth was derived. Finally, a new calculation method was proposed to determine the critical minimum suction of the bucket foundation through penetration experiments on the four-bucket foundation, and the effectiveness of the method was verified experimentally. These findings have important guiding significance for optimizing the design and construction of bucket foundations under sandy conditions.
关键词
海上风电 /
砂土 /
单筒基础 /
新型四筒基础 /
沉放试验 /
渗流 /
最小下沉吸力
Key words
offshore wind power /
sand /
single-bucket foundation /
new four-bucket foundation /
penetration test /
seepage /
critical minimum suction
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基金
中国长江三峡集团有限公司科研项目（NBZZ202300461）
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