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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.

Active Publication Date: 2020-03-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the current evaluation methods of fault activation tendency only consider various factors one-sidedly, the purpose of the present invention is to provide a method for discriminating mining fault activation tendency based on differential stress

Method used

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  • Mining fault activation tendency discrimination method based on differential stress
  • Mining fault activation tendency discrimination method based on differential stress
  • Mining fault activation tendency discrimination method based on differential stress

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Embodiment 1

[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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Abstract

The invention discloses a mining fault activation tendency discrimination method based on differential stress, and the method comprises the following steps: building a standard two-dimensional fault activation analysis geomechanical model, and analyzing the relation among the normal stress, shear stress, maximum principal stress and minimum principal stress of a fault surface according to the built model; establishing the relationship between the fault activation tendency and the fault surface normal stress, shear stress and fault surface friction strength; constructing a fault activation tendency state function expressed by differential stress; establishing a fault activation tendency discrimination criterion based on a state function; analyzing the activation tendency of the mining faultaccording to the surrounding rock stress redistribution rule under mining disturbance, and analyzing the activation stability of the mining fault. According to the mining fault activation tendency discrimination method based on the differential stress, the influences of fault characters, the ground stress state of the regional environment, the mining stress and the like are considered, and the mining fault stability analysis and evaluation method is more comprehensive and scientific.

Description

technical field [0001] The invention belongs to the technical field of mine safety, and in particular relates to a method for discriminating the activation tendency of mining faults based on differential stress. Background technique [0002] During the mining of underground ore bodies, dynamic mining and unloading will break the original stress balance of the rock mass around the stope, resulting in the redistribution of surrounding rock stress. This redistribution will change the stress state of the faults in it, making A fault that was originally in a stable state has a reactivation phenomenon in which the two plates slide relative to each other. During the fault activation process, the huge energy release and the sudden change in the permeability of the fault zone are often the cause of many geological disasters in mines, such as water inrush, gas outburst, rock burst, mine disasters, etc. Therefore, accurate analysis of the activation tendency of near-field and far-field...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/14
Inventor 周清龙曹平
Owner CENT SOUTH UNIV
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