【摘要】 研究表明,在用Abaqus模拟计算树根的抗拔强度时,土壤-树根的接触关系是一个非常重要的因素。针对土壤-树根的接触关系经常被假定为库仑摩擦模型,然而独立的库仑摩擦模型却不能很好地模拟树根的极限抗拔强度以及滑动开始之后的力学行为,基于Abaqus 6.10中的黏性材料对土壤-树根的接触关系进行模拟,在树根与土体之间加入了一层黏性材料,用以模拟树根周围的胶状土。直根拔出试验证实了黏性材料很好地弥补了库仑摩擦模型结果偏小的缺陷。分别对直根的长度-直径矩阵与直根体积固定矩阵进行了研究,得出了抗拔强度与接触面积有关的结论。更多还原

【Abstract】 Researches show that the interaction between soil and root is a significant factor when stimulating and calculating the pull-out strength of root.Generally,the interaction between soil and root is assumed to be Columb-friction model.However,the simulation results obtained by solo Columb-friction model are not optimistic for pull-out strength of root and the mechanical behavior after slide begins.In this study,the model based on cohesive material of Abaqus 6.10 is applied to stimulate the relationship between soil and root.Adding a layer of cohesive material between soil and root is used to simulate colloidal soil around the root.After conducting several tap-root pull-out tests,it is confirmed that the cohesive material can diminish the drawbacks of Columb-friction model.Diameter-length matrix and volume-fixed matrix of tap-root are studied,which shows that the pullout strength of tap-root is related to the total contact area between soil and the tap-root.更多还原