Mechanical Model And Numerical Simulation Study Surrounding Rock Fracturing

The stability of the underground grotto is threatened by a phenomenon that the rock is often split off between the underground grottos. There are many research about the brittle split of the rock, but few about the timeliness research of the splitting rock. In this paper, we used several methods like lab testing, energetic analysis and numerical modeling etc. to discuss the timeliness evolutionary mechanism of the splitting rock deeply and came out with some meaningful results.We have achieved some convenience from the uniaxial compression test because the confirmation of the mechanical parameter of rock can be used to analyse the strength characteristics. By the test, we have got the stress-strain curves and analysed several stages of the splitting rock which are the elastic stage, the stable cracking stage, the unstable cracking stage and the buckling failure stage.In this paper, we have presumed that the stress condition of the rock is uniaxial compression. We have analysed the mechanical characteristic of the defective rock and introduced the straight gliding crack to analyse the mechanism of cracking formation. According to the thermodynamic principle, energetic dissipation principle, damage mechanics and energy conservation etc., we have obtained the basic principle of splitting formation. In the process of the strain calculation, the rock is spread into two pieces which are calculated separately. In the part of the elastic strain calculation, the Hooke’s law are used. Meanwhile, in the part of the opening strain calculation, we have chosen the right method to deduce the strain formula.Base on the methods in this paper, we also used the numerical software RFPA to model. Finally, by comparison, the theoretical results coincide with the calculation by formula to judge the validity. The method will provide scientific basis for the optimal design and optimal forecast of engineering.