Analysis of the Influence Mechanism of Small Fault Activation under the Influence of Mining at Deep Coal Faces.

The influence mechanism of different geological parameters on the activation of small faults under mining in the deep coal face was investigated by numerical simulation. The study shows that (1) the degree of influence of six parameters including the fault lateral pressure coefficient λ, elastic modulus , Poisson's ratio μ, cohesion , internal friction angle φ, and fault inclination angle θ on the activation of small faults was ranked in order as θ > λ > φ > μ > > . (2) The lateral pressure coefficient λ of the fault zone rock mass, the internal friction angle φ, and the fault inclination angle θ had a great influence on the fault activation.

Application of a Simulation Method for the Shock Wave Propagation Law of Gas Explosion.

Gas explosion is one of the main causes of casualties in coal mines. Studying the propagation law of shock wave of mine gas explosion can reduce the economic loss and personnel injury caused by mine gas explosion. To solve the difficulty in the research of shock wave propagation of gas explosion in the mine scale, the segmented relay simulation method of shock wave propagation of gas explosion in a coal mine was put forward, the related key problems were studied, and the results were successfully applied in Yangchangwan No.