Mining fault activation tendency discrimination method based on differential stress

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...

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