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吸力贯入平板锚被用于系泊深海浮式结构,实际应用中必须预估平板锚旋转安装过程中的丢失埋深。采用大变形有限元方法探索非完全粗糙平板锚在正常固结黏土中的旋转过程。大变形有限元法通过网格重剖避免平板锚大幅值平动和转动引起的土体单元扭曲。根据平板锚旋转到达的埋深,实时更新“锚-土”界面上的摩擦剪切强度。将数值模拟结果与离心机模型试验进行对比验证,表明高岭土中平板锚表面的粗糙系数约为0.3。平板锚丢失埋深随粗糙系数的减小而增大,但粗糙系数对丢失埋深的影响受平板锚厚度比和拉力偏心比的耦合作用。厚度比和偏心比越小,粗糙系数对丢失埋深的影响越显著。
Suction penetration plate anchors are used to moor deep-sea floating structures. In practical applications, the lost depth during the installation of flat anchor must be estimated. Large deformation finite element method is used to explore the rotation of a non - perfectly rough plate anchor in normal consolidated clay. The large deformation finite element method avoids the twisting of soil elements caused by the large amplitude translation and rotation of the flat anchor by re-meshing. The friction shear strength at the “anchor-earth” interface is updated in real time based on the depth of arrival of the flat anchor. The numerical simulation results are compared with the centrifuge model test, which shows that the roughness coefficient of flat anchor in kaolin is about 0.3. The buried depth of the flat anchor increases with the decrease of the roughness coefficient, but the influence of the roughness coefficient on the lost depth is affected by the coupling effect of the thickness ratio of the anchor and the eccentricity ratio of tension. The smaller the thickness ratio and the eccentricity ratio, the more significant the influence of the roughness coefficient on the lost buried depth.