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由于结构物贯入时网格变形过大而产生扭曲畸变等问题,常会造成岩土工程下沉贯入领域的数值分析收敛困难甚至计算结果失真。采用合适的数值方法分析此类问题颇具挑战性。传统的有限元模拟方法往往会出现收敛困难、作出不合理的假设以及需要依赖用户的专业网格重划分和插值程序等问题。耦合的欧拉-拉格朗日(CEL)分析方法结合了拉格朗日网格与欧拉网格的优点,可以有效地解决有关大变形和材料破坏等诸多问题。通过位移控制法和力控制法两种下沉方式,进行桶形基础室内液压下沉模型试验,得出不同强度的黏土中桶形基础下沉阻力和下沉深度的关系及土塞高度。应用CEL有限元法进行模拟,计算结果与试验结果较为符合。采用的CEL有限元模拟方法不仅可对桶形基础自重下沉和液压下沉进行预测,也可为其他海洋基础结构的贯入模拟提供有益参考。
Due to the deformation of the grid caused by excessive deformation of the grid when the structure is penetrated, problems such as distortion and distortion of the geotechnical engineering sinking field are often caused and the calculation result is distorted. Analyzing such problems with suitable numerical methods is challenging. Traditional finite element simulation methods tend to converge, make irrational assumptions, and rely on the user’s professional grid re-division and interpolation procedures and other issues. Coupled Eulerian-Lagrangian (CEL) analysis combines the advantages of Lagrangian and Eulerian grids to effectively solve problems related to large deformations and material damage. Through the displacement control method and the force control method, two kinds of sinking methods were used to test the bucket foundation hydraulic subsidence model, and the relationship between the sinking resistance and sinking depth of the bucket foundation with different strength and the height of the plug was obtained. The CEL finite element method is used to simulate. The calculation results are in good agreement with the experimental results. The CEL finite element method can not only predict the sinking and hydraulic sinking of the bucket foundation, but also provide a useful reference for the penetration simulation of other marine infrastructures.