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首页> 外文期刊>Applied Ocean Research >Numerical analysis of reinstallation of spudcans near footprints formed during prior installations
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Numerical analysis of reinstallation of spudcans near footprints formed during prior installations

机译：在现有安装期间形成覆盖物附近的Spudcans重新安装的数值分析

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This paper reports the effect of the remoulded soil strength of a footprint on the reinstallation of jack-up rigs near the footprint. The footprint creation is from an earlier spudcan penetration and extraction process in which the soil is remoulded. Dissipation of pore pressures between the footprint creation and jack-up reinstallation causes further consolidation of the soil around the footprint. Large-deformation finite-element (LDFE) analyses were performed using the Coupled Eulerian-Lagrangian (CEL) approach. A recently developed novel spudcan shape with a flat base and four holes is studied to mitigate spudcan-footprint interactions during spudcan reinstallation. The installation of a whole three-legged jack-up rig is modelled considering a simplified global jack-up unit. The LDFE results were validated against existing centrifuge test data prior to undertaking a detailed parametric study, assessing the effects of consolidation occurred after footprint creation, the offset distance of spudcan installation from the footprint centre, and spudcan shape. Compared to a footprint of the same shape, but virgin intact soil strength, the footprint with remoulded soil strength enhances the maximum horizontal force, maximum moment, maximum lateral displacement, and rotation, by 12-20%. The critical offset distance is found to be one spudcan diameter with the spudcan centre being at the crest of the footprint. The novel spudcan shape is shown to be effective at easing spudcan-footprint interactions, reducing horizontal force, moment, lateral displacement and rotation by about 50%; and total stress on the jack-up leg by 41%.
机译：本文报告了占地面积的后续土壤强度对脚印附近的升降机的重新安装的影响。足迹创造是从早期的刺激性渗透和提取过程中，其中土壤被重复。占地面积和升降机重新安装之间的孔隙压力耗散导致围绕占地面积的土壤进一步整合。使用耦合的Eulerian-Lagrangian（CEL）方法进行大变形有限元（LDFE）分析。研究了最近开发的具有扁平基座和四孔的新颖的Spudcan形状，以减轻刺激性重新安装期间的雀峰占地面积。考虑到简化的全球升降装置，建模整个三腿的升降机的安装。在进行详细的参数研究之前，对现有的离心测试数据进行验证的LDFE结果，评估了占地面积后的合并效果，从足迹中心和刺素形状的炉膛安装的偏移距离。与相同形状的占地面积相比，但是处女完整的土壤强度，具有倒置的土壤强度的占地面积增强了最大水平力，最大瞬间，最大横向位移和旋转，达12-20％。发现临界偏移距离是一个刺耳直径，具有熔普犬中心位于占地面积的嵴处。该新型施晶虫形状被证明是有效的，在宽松素材 - 足迹相互作用下，减少水平力，力矩，横向位移和旋转约50％;杰克上腿的总压力41％。

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