Construction of 3D Geological Model and Application in the Slope Stability Analysis

The complicated geological structure can be accurately described by using a 3D geological model. If a 3D geological model can be applied to calculate the safety factor of slope through the integration, then the goal to transfer "visualization" to "calculation" can be realized. Through it, the advantages of GIS could be exerted and the purpose that analyzing slope's stability based on the mechanics of the professional analysis could be achieved. The main contents in this paper include: (1) The database of the three-dimensional geological model, and the methods and process of interpolations are introduced. By using the three-dimensional solid model, even profiles of the drilling wells were generated. (2) Considering the drawbacks of the 3D Sarma method, two aspects were modified. First, though the interface of every column satisfies the Mohr-Coulomb's Law, the parameters between the bottom surface and the lateral surface are different. Second, the probability of the lateral and bottom surface are subjected to damage simultaneously is low. (3) The database of 3D geological model was applied to three-dimensional limit equilibrium successfully by programming. (4) Finally, using the GOCAD a three-dimensional geological model of an engineering slope was built as part of the work presented in this paper. Afterward, the safety factor of slopes, by using of the three-dimensional limit equilibrium method in different conditions, such as water loading, earthquake loading, were solved. The calculation results can help us to better understand the slope's stable state.