Fracture mechanical model and criteria of insidious fault water inrush in coal mines
Abstract：The shortest distance between a permeable fault and the mine floor is considered the main path for water inrush.A simplified fracture model of water inrush through a fault in the floor was developed based on the spatial relationship between the permeable fault and the plastic region of the floor.Fracture mechanics was used to analyze the stress intensity factor on a finite plate having an oblique crack.This allowed the critical water pressure for hydraulic splitting to be obtained.The results show that the critical water pressure decreases as the length of the fault increases.An increase in the distance between the fault and floor,and a decrease in horizontal pressure,also will cause a decrease in critical water pressure.Crack propagation theory in a state of compressive shear requires that water inrush through an insidious fault be preceded by the water pressure reaching a critical value.It is sufficient that the distance between fault and floor reach a critical value.A theoretical formula expressing these relationships is presented.
Keywords：fault water-inrushgeological mechanical modelhydro-splitting analysisstress intensity factor
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)