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本文采用动力接触有限元法分析了强夯对地基土的冲击碰撞过程。夯击过程中 ,夯点周边地基土存在局部大变形现象。采用无限小应变度量将不能消除刚体位移的影响 ,必须采用大变形理论。为了保证显示算法的网格稳定性 ,计算模型中考虑了侵蚀分析。锤底接触力和夯沉量在计算过程中直接求得 ,模型考虑了夯锤自重 ,能够模拟夯锤与地基土的多次接触分离过程 ,适应于各种复杂的地基土结构。文章最后给出了一个工程实例 ,以验证本文计算模型。
In this paper, the dynamic contact finite element method is used to analyze the impact and impact process of dynamic compaction on foundation soil. During the ramming, there is a large local deformation of the foundation soil around the ramming point. The use of infinitely small strain measurements will not eliminate the effects of rigid body displacements and must be based on large deformation theory. In order to ensure the grid stability of the display algorithm, the erosion model is considered in the calculation model. Hammer bottom contact force and rammer weight are directly calculated in the calculation process. The model considers the weight of rammer, which can simulate multiple contact and separation process between rammer hammer and subsoil so as to adapt to various complex soil structures. Finally, the article gives an example of the project to verify the calculation of the model.