Numerical and experimental analysis of the extraction mechanism of an anchor plate embedded in saturated sand
Numerical and experimental analysis of the extraction mechanism of an anchor plate embedded in saturated sand
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DOI：
10.1016/j.compgeo.2019.03.014
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发表时间：
2019-07
影响因子：
5.3
通讯作者：
M. Kanitz;A. Hager;J. Grabe;C. Goniva
中科院分区：
文献类型：
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作者：
M. Kanitz;A. Hager;J. Grabe;C. Goniva
浮动海上结构可以建立在水下基础上，例如锚板。它们的抗萃取性在生命周期期间和结束时非常重要。在其生命周期中，基础由于波浪、潮汐流和风载荷而悬挂在复杂的载荷条件下，并且必须知道其阻力。在生命周期结束时，必须将锚板从海底移除。因此，锚的拔出阻力远高于其自重、静水压力和土压力的总和。当锚板移动时，下方的体积会增加。这会产生吸力，直到流入的孔隙水充满新创建的体积。为了研究这种效应，进行了位移驱动提取模型规模的实验研究。孔隙压力测量是在土体和板下方的不同位置进行的。土壤运动通过粒子图像测速法（PIV）进行跟踪。在进行的实验中，考虑不同的萃取速度以研究其对萃取阻力的影响。对未解决的耦合 CFD-DEM 进行了数值研究，并根据实验结果进行了验证。
Floating offshore structures can be founded on submerged foundations such as anchor plates. Their extraction resistance is of major importance during and at the end of the lifetime cycle. During their lifetime cycle, the foundation is suspended to complex loading conditions due to waves, tidal currents and wind loads and its resistance has to be known. At the end of the lifetime cycle, the anchor plates have to be removed from the seabed. The extraction resistance of the anchors is thereby a lot higher than the sum of its self-weight and hydrostatic and earth pressure. When the anchor plate is moved, the volume underneath increases. This leads to a suction until inflowing pore water fills the newly created volume. In order to investigate this effect, an experimental study at model scale with a displacement-driven extraction is performed. Pore pressure measurements are carried out at various locations in the soil body and underneath the plate. The soil movement is tracked with the particle image velocimetry method (PIV). In the conducted experiments different extraction velocities are considered to investigate its effect on the extraction resistance. Numerical investigations with unresolved coupled CFD-DEM are carried out and validated against the experimental results.