A new strain softening damage constitutive model for rocks based on defects growth

被引：0
|
作者：
Liu D. [1 ]
Li D. [1 ,2 ]
Zhang X. [1 ,2 ,3 ]
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology(Beijing), Beijing
[2] School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing
[3] College of Civil Engineering, Shaoxing University, Shaoxing, 312000, Zhejiang
来源：
| 1600年 / Academia Sinica卷 / 36期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Compression test; Constitutive model; Damage evolution; Defects growth; Rock mechanics; Strain softening;
D O I：
10.13722/j.cnki.jrme.2017.0934
中图分类号：
学科分类号：
摘要：
The defects evolution characteristics in the complete deformation process of rocks are analyzed, the results show that the stress-strain curves of rocks can be divided into five stages including elasticity recovery, damage retaining, damage initiation, damage acceleration and damage slow-down. Based on the "elastic modulus method" derived from the hypothesis of strain equivalence, damage evolution law is further studied. And a defects grown model is proposed based on the hypothesis of rock micro unit, and it can describe the complete damage evolution process well. Then a damage constitutive model is developed. This model can describe the complete deformation process of rocks satisfactorily. The used mathematical function is simple with just four model parameters, and each parameter has distinct physical meaning. Finally, the theoretical results fit very well with the test results in relevant references, which indicate the rationality of this model. © 2017, Science Press. All right reserved.
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页码：3902 / 3909
页数：7
相关论文
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