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Laboratory tests on soil-skirt interaction and penetration resistance of suction caissons during installation in sand

机译：沙箱中吸水沉箱的土裙相互作用和渗透阻力的实验室测试

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摘要

As a new form of offshore foundation, suction caissons have been applied to several offshore wind power projects. In the present study, a series of tests were carried out based on laboratory scales with an aim to investigate the interaction mechanisms between the caisson and saturated sand in both jacking installation and suction installation processes. For the jacking installation, the results indicate that the inner soil pressure acting on the skirt of the caisson is equivalent to the outer when the relative sensor depth (h/D, where h and D are the sensor depth and the diameter of the caisson, respectively) is less than about 0.3. The inner soil pressure, however, exceeds the outer when h/D > 0.3. For the suction installation, the results show that the inner soil pressure is dramatically reduced once stable suction is applied. In contrast, the outer soil pressure increases at first and then falls down to a stable level rapidly when stable suction is applied. Based on the test results, the previous formulae of the penetration resistance and required suction of caissons have been revised and evaluated.
机译：作为一种新型的海上基础，沉箱已被应用到多个海上风力发电项目中。在本研究中，基于实验室规模进行了一系列测试，目的是研究在顶管安装和抽吸安装过程中沉箱与饱和砂土之间的相互作用机理。对于顶升安装，结果表明，当相对传感器深度（h / D，其中h和D分别是传感器深度和沉箱直径时，作用在沉箱裙部上的内部土壤压力等于外部压力。分别小于约0.3。但是，当h / D> 0.3时，内部土壤压力会超过外部。对于抽水装置，结果表明，一旦施加稳定的抽水，内部土壤压力就会大大降低。相反，当施加稳定的吸力时，外部土壤压力首先增加，然后迅速下降至稳定水平。根据测试结果，对沉箱的渗透阻力和所需吸力的先前公式进行了修改和评估。

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  • 来源
    《Ocean Engineering》 |2014年第1期|1-13|共13页
  • 作者

    Jijian Lian; Fei Chen; Haijun Wang;

  • 作者单位

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Soil pressure; Seepage; Compaction effect; Resistance reduction; Formula revision;

    机译：土压力;渗漏;压实效果;降低阻力;公式修订;

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