Comparative study on three-dimensional conventional and modified statistical damage constitutive models

Multiscale and Multidisciplinary Modeling, Experiments and Design - Tập 2 - Trang 259-267 - 2019
Kai Chen1,2, Ming Tang1, Zhenyu Guo1,3
1SUCG Infrastructure India Private Limited, New Delhi, India
2Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou, China
3School of Management, Huazhong University of Science and Technology, Wuhan, China

Tóm tắt

Considering the random distribution of the microscopic unit strength of rock, lognormal distribution in the past was widely used as the distribution function of the strength of the rock. Based on rock damage theory and statistical strength theory, a traditional damage constitutive model and a modified damage constitutive model in this paper are established. Then, we carry out traditional triaxial compression experiment to validate and compare these two damage constitutive models. These results show that: (1) in the elastic stage of rock deformation, these two theoretical damage constitutive model curves are in good agreement with their experimental curves; (2) in the plastic stage of rock deformation (yield and strain softening), the fitting effect of damage constitutive model with residual strength is better than that of traditional damage constitutive model. Moreover, compared with the traditional damage constitutive model, the modified damage constitutive model can better describe the transition process from brittleness to ductility with the increasing confining pressure. Finally, by comparing the damage variable D of the two damage constitutive models, we can find that the damage variable D of the modified model is closer to actual damage degree of rock, which can better reflect the damage condition of rock during loading. Therefore, the modified damage constitutive model can better describe the deformation of rock under loading and has better rationality.

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Multiscale and Multidisciplinary Modeling, Experiments and Design

Tập 2

259-267

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