Study On Unstability Mechanism And Stablilityanalysis Of Soft Rock Slope In Baorixile Open Mining

With the development in construction and mining of open pit coal mine, the problem of slope stability is standing out.The Stability of Soft-Rock Slope had a long history, but still lagged behind, and it failed to satisfy the requirements on the slope stability of the modern mine production. Especially in the soft rock slope’s deformation instability. In recent years,our country open up several big-size open pit mines in inner Mongolia, which are all soft rock slope. The stabilization of them have became one of the major factor which influence the safety operation and economic efficiency in open pit mines..Based on the soft rock deformation and failure characteristics, mechanism and laws, Paper put forward the definition of soft rock slope of the straight and standards, then proves that the soft rock slope stability mainly depends on straight slope Angle, slope height, cohesive force, internal friction Angle and the parameters such as density. And deduced straight slope the dimensionless mathematical model and method by theoretical analysis and numerical simulation.According to the characteristics of the Baorixile open-pit mine of soft rock slope and definition of soft rock slope, partition stope slope. On the basis of partition,comprehensive analysis for each area respectively by finite element method, finite difference method, limit equilibrium method, and dimensionless analysis method to analysis possible instability of the three slope.Analysis results of various methods points out that Ⅳ slope is stable, whereas Ⅰ、 Vzone is unstable, the corresponding measures should be taken to control.Through comparing various kinds of methods,paper prove that the dimensionless stability evaluation method can reflect the degree of slope stability,and point out that the method can be used for soft rock slope of the straight pre-assessment and analysis with other methods.