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Title: Study of damage constitutive model of brittle rocks considering stress dropping characteristics
Authors: Li, Fei
You, Shuang
Ji, Hongguang
Wang, Hao
Keywords: Engineering::Civil engineering
Issue Date: 2020
Source: Li, F., You, S., Ji, H. & Wang, H. (2020). Study of damage constitutive model of brittle rocks considering stress dropping characteristics. Advances in Civil Engineering, 2020.
Journal: Advances in Civil Engineering 
Abstract: Deep brittle rock exhibits characteristics of rapid stress dropping rate and large stress dropping degree after peak failure. To simulate the whole process of deformation and failure of the deep brittle rock under load, the Lemaitre strain equivalent theory is modified to make the damaged part of the rock has residual stress. Based on the damage constitutive model considering residual strength characteristics, a correction factor reflecting stress dropping rate is added, the Weibull distribution is used to describe the inhomogeneity of rock materials, and Drucker-Prager criterion is used to quantitatively describe the influence of stress on damage; a damage constitutive model of deep brittle rock considering stress dropping characteristics is established. According to the geometric features of the rock stress-strain curve, the theoretical expressions of model parameters are derived. To verify the rationality of the model, triaxial compression experiments of deep brittle rock under different confining pressures are conducted. And the influence of model parameters on rock mechanical behaviour is analysed. The results show that the model reflects the stress dropping characteristics of deep brittle rock and the theoretical curve is in good agreement with the experimental results, which indicates that the proposed constitutive model is scientific and feasible.
ISSN: 1687-8086
DOI: 10.1155/2020/8875029
Schools: School of Civil and Environmental Engineering 
Rights: © 2020 The Author(s). This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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