Study Of The FEM And PCA Simulation Algorithm Of Rock Creep Characters

In practical project, the deformation of rock shows the character of changing with time, which is called the creep phenomenon, because of long period of load. So many projects stick into endless deformation and even into failure, and then lose stability. In order to solve the design and maintenance of underground projects, therefore, it is realistic and critical to study the creep phenomenon. In this paper, it is an elementary attempt to simulate the creep deformation and failure of rock, to present two simulated methods, and to make validation. Firstly, According to the finite element method solving the creep problem in a classical way, the Kelvin model is selected, that is suitable to simulate stable creep problem, and the program is written using C++. The software is applied to simulate the deformation trend of test rock under the condition of uniaxial compression, and the conclusions from the simulation are basically consistent with those of creep test. Secondly, the cellular automata theory is introduced in the paper. The achievements of the predecessors and the deformation characters of rock creep are combined in the paper, then the cellular automata model is built used to simulate rock creep. Then the software is written adopting C++, and the deformation trend of test rock is simulated, which is in the state of stable creep and unstable creep, under the condition of uniaxial compression in the sense of energy. The conclusions accord with the known test results. And a qualitative analysis is made. Finally, the new idea is presented about the application of the PCA model in the field of rock mechanics, such concepts as stress, strain and displacement are introduced in the CA model. The CA model and FEM are combined, then the differential PCA-FEM algorithm is set up, which attempts to simulate the deformation and failure of rock in the sense of vector.