| Numerical method has been widely adopted in scientific research and engineering design. To seek the application of computational simulation to geo-science we make use of the commercial software ANSYS for geophysical simulation. Two processes have been conducted. One is the rock's rheological property while the other, an earthquake triggering model. A 3-dimesion FEM model was adopted to simulate the rheological model, which has three layers, contacted one by one. The interfaces are immersible. As for the rock's rheological property, we define the material's as creep one because the rheological property plays an important role in the rock's deformation. The result indicates that the rheological property controlled the boudinage formation process in geological structure. Also, the relation between the wavelength and some rheological parameter is obtained. As far as the earthquake dynamic triggering is concerned, it is well know that if coulomb's equivalence force below the friction limit, the rock blocks don't slip. And any extra static compress pressure will enhance the friction and make them more difficult to slip. But a dynamical compress impact caused a surprise result, the rock blocks slide, and then stop. The simulation says this phenomenon is due to the reflection of dynamic stress. If reflection occurs at the free surface, the phase of wave changes 180 degree, that is, the half-wave lost. The half-wave lost means compress wave turn into tensile one and vice versa. It is the reflected tensile wave that causes the slip. The study shows that the dynamic stress is very different from static one, and earthquake dynamic triggering is a reasonable process and which has been verified by observation. The study says that FEM simulation can be an effective method for research on geo-science.
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