Based On The Theory Of Fracture Mechanics And Damage Mechanism Of Fractured Rock Mass Damage Is Studied

In the fractured rock mass under complex stress, affect the internal damage and damage evolution process of engineering rock mass strength, stability and seepage and other aspects has been the focus and difficulty in the study of rock mechanics and rock engineering. In order to study the analysis of fractured rock mass in the complex should influence the macroscopic mechanical behavior of fractured rock mass under the action of stress and damage evolution process, the rock fracture mechanics, damage mechanics and numerical simulation theory of the preliminary study.Based on fracture mechanics theory, the study pressure shear, tensile shear stress under the action of fractured rock mass within the original crack criterion of crack, crack location and crack propagation criterion, explore the rock strength, crack surface of rock bridge, coefficient of internal friction, cohesive force, internal friction coefficient of rock crack spacing and crack angle, azimuth angle of rock bridge,etc. The influence mechanism of crack penetration mode.Combining Betti energy reciprocal theorem and the theory of fracture mechanics, using the superposition theory and the volume average equivalent hypothesis, establish contains multiple sets of original crack damage constitutive equation of fractured rock mass, the loads within the fracture rock wing crack propagation length and the change law of original crack number, the dynamic damage evolution mechanism of fractured rock mass.According to the model to calculate the fractured rock mass under complicated stress curves of stress-strain relationship, by fitting analysis of experimental data, show that the damage and damage evolution constitutive model more accurately reflects the physical response characteristics of pore fracture rock, an analysis of fractured rock mass damage mechanics properties have a certain reference role in the process of evolution.Based on TPHM model, the physical mechanism is discussed about the effects of fracture and porosity on the elastic mechanical behavior and S-wave velocity of rocks, the TPHM wave equation for porous and fractured rocks is established. Moreover, we show that the equation is generally consistent with the present and existing experimental results, which indicates that the approach is a valid and an effective way of dealing with the dynamic response problems in rocks. The nonlinear elastic wave propagation behavior can be investigated through the model, because effects of pores and factures on rock macroscopic physical properties have been considered essentially.