基于断裂能的岩土节理弹性-软化塑性本构模型

基金项目: 辽宁省自然科学基金资助课题(070091)

A Fracture-Energy-Based Elasto-Softening-Plastic Constitutive Model for Joints of Geomaterials

1.
Department of Architecturar Engineeing, Shenyang University of Technology, Shenyang 110023, P. R. China;
2.
Department of Applied Sciences, Taiyuan Institute of Heavy Machine, Taiyuan 030024, P. R. China

摘要: 基于准脆性材料的断裂力学和塑性理论,提出了用于岩土节理软化行为描述的弹性软化塑性本构模型.模型的主要特点是:1)节理材料的软化塑性和扩容特性直接与断裂失效过程相联系,所采用的材料参数比已有的弹塑性软化模型所用的参数少;2)模型可以描述混合断裂失效及相应的摩擦滑动,具有较广的适用性.
- 界面裂纹 /
- 类脆性断裂 /
- 节理单元 /
- 扩容 /
- 非关联的塑性
Abstract: On the basis of plasticity and fracture mechanics for quasi-brittle materials, this article presented a constitutive model for gradual softening behavior of joints of geomaterials. Corresponding numerical tests are carried out at the local level. Characteristics of the model proposed are:1) plastic softening and dilatancy behavior are directly related to the fracture process of joint, and much less material and model parameters are required compared with those proposed by references; 2) the process of decohesion coupled with frictional sliding at both micro-scale and macro-scale is described.
- interface crack /
- quasi-brittle fracture /
- joint element /
- dilatancy /
- non-associated plasticity

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