The Influence of Fault Dip Angle on the Floor Fault Activation

Abstract

In order to study the influence of different fault dip angle on fault activation under different mining conditions, the supporting pressure distribution model of corresponding working face is established and the formula of stress on the fault plane is also derived. Combined with the Mohr-Coulomb yield criterion, the essay summarizes the critical factor of fault rock yield activation. The contributions of fault dip angle and base disturbance to critical factors are further analyzed. At the same time, by using FLAC software, the rules of different inclined fault in mining whose floor of the plastic zone around the propagation and the variation of the stress field characteristics are analyzed. The simulation results showed that connected condition of floor plastic zone and the regularity influence floor water inrush. The research shows: small obliquity faults and shallow area faults are more likely to be activated, and small obliquity faults are more susceptible to affect disturbance leading to the bottom of plastic failure. The results would have an important value to preventing against fault water inrush accident and projecting the waterproof pillar.