Rock is a typical defective brittle material. The dynamic strain rate of rock has a very important influence on the dynamic deformation process of rock. Considering the non-linear effect of rock dynamic strain rate on rock strength, by improving the existing rock dynamic strength criterion, a non-linear dynamic strength criterion reflecting the effect of strain rate is established. Then, based on the non-linear dynamic strength criterion, by introducing statistical damage theory, the statistical damage constitutive model of rock dynamic deformation process is constructed, and the crank of rock dynamic triaxial test is put forward. Through triaxial compression tests, the whole process of rock non-linear deformation is divided into five stages: Initial compaction stage, linear deformation stage, strain hardening stage, strain softening stage and residual strength stage. In addition, the elastic modulus of some rocks varies with the confined pressure of triaxial tests in the on-line deformation stage. On this basis, statistical damage theory is introduced. Considering the influence of damage threshold and the deformation characteristics of residual strength stage, the analysis method of local deformation of rock matrix is obtained. A statistical damage constitutive model is established to simulate the whole process of rock non-linear deformation. The method of determining model parameters by triaxial compression test curve of rock is proposed. The analysis and discussion of an example show that the method is reasonable and feasible.

Ming Zhao. Statistical Damage Simulation Method for Rock Dynamic Deformation Process Based on Nonlinear Dynamic Strength Criterion. International Journal of Engineering Technology and Construction (2020), Vol. 1, Issue 2: 1-13. https://doi.org/10.38007/IJETC.2020.010201.

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