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A Differential Stress Based Discrimination Method for Mining Fault Activation Tendency

A discriminant method, a tendency technology, applied in the direction of design optimization/simulation, instrumentation, electrical digital data processing, etc.

Active Publication Date: 2021-06-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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  • A Differential Stress Based Discrimination Method for Mining Fault Activation Tendency
  • A Differential Stress Based Discrimination Method for Mining Fault Activation Tendency
  • A Differential Stress Based Discrimination Method for Mining Fault Activation Tendency

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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 the Mohr-Coulomb failu...

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Abstract

The invention discloses a method for discriminating the activation tendency of mining faults based on differential stress. The relationship between the stress and the minimum principal stress; establish the relationship between the fault activation tendency and the normal stress, shear stress and friction strength of the fault surface; construct the state function of the fault activation tendency expressed by the differential stress; establish the state function based on According to the fault activation tendency discrimination criterion; according to the mining disturbance under the surrounding rock stress redistribution law to analyze the activation tendency of the mining fault, analyze the activation stability of the mining fault; the invention proposes the mining fault activation tendency based on the differential stress The discriminant method takes into account the influence of fault properties, regional environmental stress state, mining stress, etc., and is a more comprehensive and scientific analysis and evaluation method for the stability of mining faults.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/14
Inventor 周清龙曹平
Owner CENT SOUTH UNIV