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• W4313894674 abstract "The rock or rock mass in engineering often contains joints, fractures, voids, and other defects, which are the root cause of local or overall failure. In response to most of the current constitutive models that fail to simulate the nonlinear fracture compaction deformation in the whole process of rock failure, especially brittle rocks, a piecewise constitutive model was proposed to represent the global constitutive relation of rocks in this study, which was composed of the fracture compaction empirical model and the damage statistical constitutive model. The fracture empirical compaction model was determined by fitting the expressions of fracture closure curves of various rocks, while the rock damage evolution equation was derived underpinned by the fracture growth. According to the effective stress concept and strain equivalence hypothesis, the rock damage constitutive model was deduced. The model parameters of the fracture compaction empirical model and damage statistical constitutive model were all calculated by the geometrical characteristics of the global axial stress-strain curve to guarantee that the models are continuous and smooth at the curve intersection, which is also simple and ready to program. Finally, the uniaxial compression test data and the triaxial compression test data of different rocks in previous studies were employed to validate the models, and the determination coefficient was used to measure the accuracy. The results showed great consistency between the model curves and test data, especially in the pre-peak stage." @default.
• W4313894674 created "2023-01-10" @default.
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• W4313894674 date "2023-01-07" @default.
• W4313894674 modified "2023-10-14" @default.
• W4313894674 title "Fracture Closure Empirical Model and Theoretical Damage Model of Rock under Compression" @default.
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• W4313894674 doi "https://doi.org/10.3390/ma16020589" @default.
• W4313894674 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36676326" @default.
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