【摘要】 在进行基础或结构物下沉贯入的数值分析时,常会遇到接触的处理困难、网格大变形造成的扭曲畸变等问题,引起程序收敛困难、计算失真。应用何种数值分析方法,准确的模拟下沉过程结构物和土的相互作用,已成为此领域的一个重要课题。耦合的欧拉-拉格朗日方法结合了欧拉计算方法与拉格朗日计算方法的特点,通过固定的欧拉网格及可以在网格中运动的材料,可有效的处理网格畸变等大变形分析中存在的解法困难,其接触算法可得到基础或结构物准确的应力应变状态。通过砂土中桩的静压下沉、吸力锚的自重下沉和海底管线自沉分析三个应用实例,表明CEL有限元法可有效模拟大变形问题,所得的计算结果有较好的适用性。其分析方法和成果可为其它类型基础结构的下沉分析提供有益参考。更多还原

【Abstract】 The finite element methods of foundation penetration often encountered difficulties such as contact,distortions caused by large mesh deformations etc.,which result in difficulties in convergence and calculation distortion. The proper numerical analysis method used to accurately simulate the interaction between structure and soil has become an important issue in this field. The coupled Eulerian-Lagrangian method was adopted to establish a model by fixing the grid in the Euler grid and the material which can then flow freely in the grid and effectively solve the issues of large deformation and material damage. The accurate stress-strain state of the foundation or structure can be obtained based on the Eulerian-Lagrangian contact algorithm. Three examples of pile penetration in sand,dead weight penetration of suction anchor and the pipeline penetration show that the coupled Eulerian-Lagrangian method could effectively simulate large deformation problems than other methods in penetration analysis of geotechnical engineering. The numerical simulating methods of penetration in geotechnical engineering could provide useful reference to correlative researchers.更多还原