Mining fault activation tendency discrimination method based on differential stress
A discriminant method, a tendency technology, applied in design optimization/simulation, instrumentation, electrical digital data processing, etc.
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[0029] In the present invention, a method for discriminating the activation tendency of mining faults based on differential stress, such as figure 1 shown, including the following steps:
[0030] Step 1. Establish as figure 2 The standard two-dimensional geomechanical model for fault activation analysis is shown, and the model satisfies that the normal direction of the fault plane is contained in the maximum principal stress (σ 1 ) and minimum principal stress (σ 3 In the plane determined by the direction of ), the intermediate principal stress (σ 2 ) direction is included in the fault plane (σ 1 >σ 2 >σ 3 ), so σ 2 It will not affect the normal stress and shear stress of the fault, and the dip angle of the fault is α. According to the established model, the normal stress of the fault plane (σ n ), shear stress (τ n ) and the maximum and minimum principal stresses are:
[0031]
[0032]
[0033] Step 2. According to the specific theory of Mohr-Coulomb failure c...
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