| 基于断裂能的岩土节理弹性-软化塑性本构模型 |
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| 引用本文： | 沈新普,沈国晓. 基于断裂能的岩土节理弹性-软化塑性本构模型[J]. 应用数学和力学, 2002, 23(9): 975-981 |
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| 作者姓名： | 沈新普 沈国晓 |
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| 作者单位： | 1.沈阳工业大学建筑工程系, 沈阳, 110023; |
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| 基金项目： | 辽宁省自然科学基金资助课题 (0 70 0 91) |
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| 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.
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| 关 键 词： | 界面裂纹 类脆性断裂 节理单元 扩容 非关联的塑性 |
| 文章编号： | 1000-0887(2002)09-0975-07 |
| 收稿时间： | 2001-08-13 |
| 修稿时间： | 2001-08-13 |
A Fracture-Energy-Based Elasto-Softening-Plastic Constitutive Model for Joints of Geomaterials |
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| SHEN Xin_pu ,SHEN Guo_xiao. A Fracture-Energy-Based Elasto-Softening-Plastic Constitutive Model for Joints of Geomaterials[J]. Applied Mathematics and Mechanics, 2002, 23(9): 975-981 |
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| Authors: | SHEN Xin_pu SHEN Guo_xiao |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | interface crack quasi_brittle fracture joint element dilatancy non_associated plasticity |
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