基于拉-压损伤模型的爆破漏斗动力响应分析

以爆破漏斗试验为对象,建立基于H-J-C(JOHNSON_HOLMQUIST_CONCRETE)损伤模型并考虑岩体拉伸损伤的拉-压动力损伤本构模型,运用LS-DYNA软件,在构建动力有限元模型的基础上,研究爆破漏斗的形成过程,分析岩体的动力损伤特征,并与实测数据进行对比。研究结果显示:该模型的计算结果与理论和试验的结果相符,拉-压损伤动力模型可较好地反映岩体的动力损伤特征;通过与实测结果的对比分析揭示爆破漏斗形成机理和岩体的破坏形式;自定义的岩体拉-压损伤模型具有一定的工程应用价值。

Dynamic response of blasting crater based on tension-compression damage model

The damage model was established based on H-J-C and the tension-compression dynamic damage constitutive model was also considered by taking blasting crater test as the research object.Using the LS-DYNA software,the formation of the blasting crater was studied and the rock dynamic damage characteristics were analyzed based on the construction of the dynamic finite element model.And the numerical results were compared with the test data.The results show that the numerical results of the model are consistent with both theoretical and experimental results.And the characteristic of dynamic damage of rock mass can be clearly reflected using the tension-compression dynamic damage model.The mechanism of blasting crater formation and the rock failure patterns are revealed by comparing the numerical results with measured results.The user-defined tension-compression damage model has certain value of engineering application.