无厚度界面元程式研发与土壤极限分析应用

Programming development and application of zero-thickness interface elements to the limit analysis of soil

为了解土壤极限承载能力与其相关破坏机制,以研发之有限元分析程序同时考虑多段式无厚度界面元,其界面力学行为遵循莫尔–库仑破坏准则,并配合极限分析理论,模拟土壤破坏滑移面力学行为与各种不同几何之破坏机制,进而应用于土壤浅基础和边坡浅基础之极限承载力计算。经由分析结果显示,使用有限元配合多段式无厚度界面元之分析模式,可藉由网格优化程序进行土壤极限分析与破坏机制之模拟,不仅可以了解土壤之渐进破坏行为,亦能计算出土壤极限承载力之最小上限值,且有限元分析计算结果与极限分析上限值相互符合。

For understanding the ultimate bearing capacity and failure mechanism of soil,the finite element programming developed in laboratory based on the Mohr-Coulomb’s failure criterion considering the multiple zero-thickness interface elements is investigated.Under different geometrical conditions of failure mechanism,the ultimate bearing capacities of soil in the case studies of shallow foundation and slope foundation are particularly studied by using the mesh optimization procedure.According to the obtained results,the minimum value of upper bound by the limit analysis and that by numerical calculation are theoretically in coincidence,and the progressive failure of soil can be practically predicted.