【摘要】 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。更多还原

【Abstract】 This paper uses dynamic contact FEM to analyze impact and collision course of dynamic compaction to foundation soil. There is local large deformation in the peripheral foundation soil of the compacting spots. Since the mechanical derivation of infinitesimal strain can’t eliminate effect of rigid displacement, large deformation theory must be used in it. Erosion element is used in calculation model for ensuring the mesh stability of explicit algorithm. The hammer’s contact force and contact displacement are worked out in the course of calculation,and dead weight of hammer is taken into account. The model used can simulate the separating or contacting course between hammer and foundation soil and it is applicable to cases of complex foundation soil structure. At the end of this paper, an engineering example is discussed to test and verify this model.更多还原