富坤,刘占国,尹燎原,等. 负压桶基础沉贯试验研究与分析[J]. 水利水运工程学报,2021(5):129-136. doi: 10.12170/20200710001
引用本文: 富坤,刘占国,尹燎原,等. 负压桶基础沉贯试验研究与分析[J]. 水利水运工程学报,2021(5):129-136. doi: 10.12170/20200710001
(FU Kun, LIU Zhanguo, YIN Liaoyuan, et al. Experiment and analysis on penetration of suction bucket foundation[J]. Hydro-Science and Engineering, 2021(5): 129-136. (in Chinese)). doi: 10.12170/20200710001
Citation: (FU Kun, LIU Zhanguo, YIN Liaoyuan, et al. Experiment and analysis on penetration of suction bucket foundation[J]. Hydro-Science and Engineering, 2021(5): 129-136. (in Chinese)). doi: 10.12170/20200710001

负压桶基础沉贯试验研究与分析

Experiment and analysis on penetration of suction bucket foundation

  • 摘要: 作为新型基础,负压桶基础具有较好的技术经济性。针对负压桶施工关键控制指标土塞隆起率的控制,通过开展粉质黏土中的负压桶沉贯模型试验,研究不同负压加载模式对施工效率及土塞隆起率的影响。试验加载负压均位于DNV规范方法获得的所需负压和临界负压之间。相同贯入深度条件下,消散模式施加的负压值大于持荷模式,且较大单级荷载下的负压消散模式在保持一定施工效率的同时,对土塞隆起率的控制效果较优。理论分析表明,深度变化率越大内侧摩阻力越大,土塞越难以形成,并从超孔隙水压力结果解释了负压消散模式下的土塞隆起率降低机理。土压力分析结果表明:负压消散模式下桶内土体对桶壁的有效应力高于负压保持加载模式,前者的侧摩阻力也更大。

     

    Abstract: As a new type of foundation, the suction bucket foundation has good technical and economic performances compared with traditional foundations. The key construction parameter, soil plug, and construction efficiency are analyzed through model tests of a suction bucket foundation in silty clay with different suction pressures applied. Measured suction pressure in tests with different suction pressure applying patterns are between the required value and the critical value calculated by the DNV standard. The suction pressure in suction releasing pattern is larger than that in suction maintaining pattern for suction bucket to reach the same depth. In addition, the least soil plug degree is obtained in the suction releasing pattern with a large suction pressure increment, provided penetration efficiency is assured. Theoretical analysis shows that the inside friction resistance increases with the gradient of inside pressure along depth and large friction resistance restricts the formation of soil plug. The mechanism of reduced soil plug in suction releasing pattern is explained by the excess pore water pressure results. The earth pressure results show that the normal effective stress mobilized on the bucket wall in the suction releasing pattern is larger than that in the suction maintaining pattern. Accordingly, the side friction mobilized of the former is also larger.

     

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