Meso-numerical Study On Elastic Brittle Rock Damage Evolution And Engineering Aapplications

Mechanical behavior of rock is determined by its internal meso-structure. A large number of meso-elements strong interactions constitute complex macroscopic mechanical properties of rock specimen. Therefore, in order to understanding the complex behavior of macroscopic specimens, the effective method is starting from study on meso-mechanical behavior of the structure. Through a comprehensive approach, overall macro-mechanical behavior of the specimen can be abtained.In this paper, the rock meso-damage evolution mechanics model which based on the experimental research and theoretical analysis was established. Through grid-based finite element model, the macroscopic mechanical behavior of specimens were reflected by a large number of meso-elements strong interactions. The strain-softening mechanical properties of rock specimens were reflected by meso-damage irreversible evolution of meso-elements.As the verification of above-mentioned principle, this paper simulated two- dimensional plate from the dot pattern meso-damage to the macro run-through broken irreversible fractal growth process in self-adaptive displacement loading conditions. Thereinto, all of the meso-damage mechanism is tensile strain criteria. Numerical procedures are parametric program on the platform of ANSYS.Numerical simulation and laboratory stress-strain curves of rock have the same characteristics which illustrates the correctness of meso-damage model. Then, the damage evolution process of rock tunnel damage area was simulated and simulation results are very consistent with field observations of rock burst. This explains that the dynamics evolution of rock burst is indeed existent. So, its embryonic stage can be predicted by numerical simulation methods.