Stability analysis and reinforcement on three-dimensional slope based on long-term strength of rock mass

The model is 1000 meter in X direction and Y direction, and 570 meter height in Z direction, the model and the lithology can be seen in Figure 1.

The slope is formulated by three excavation steps. The depth of the first excavation step is 140 m from the surface of +150 m, the second is 120 m, and the third is 170 m, the total excavation height is 430 m. The elastic-plastic criterion of Mohr-Coulomb is used to calculate. Mechanics parameters of rock mass and joints can be seen in Table 1 and Table 2 (the Capital Steel Corporation 2010).