Analysis of Mining Effect and Fault Stability Under the Influence of Normal Faults

Abstract

Dynamic disasters often occur in coal mining process, while mining disasters near faults are more serious and complex. Faults are distorted by mining, which releases a lot of energy and easily induces dynamic disasters such as rockburst and roadway instability. This study takes the 10,416 working face of Yang Liu Coal Mine (YLCM) as the engineering background, and uses numerical simulation to study the dynamic response characteristics of the working face advancing towards the hanging wall of the normal fault. In addition, the influence law of normal fault dip on fault stability is discussed in this study. The results show that when the working face of the hanging wall is mined and the working face is 30 m away from the fault, the abutment pressure in the middle of the face reaches the maximum. When the width of the fault coal pillar is 20–30 m, the possibility of rock burst on the working face is the greatest. The static load type impact ground pressure is more likely to occur when the hanging wall face advances. The greater the dip angle of fault, the higher the possibility of fault activation. High dip faults are more likely to induce dynamic disasters such as rock burst, mine earthquake, bracket pressure and so on. The research results of this study provide a scientific basis for the division, prediction and prevention of rock burst dangerous zone in mining face under similar geological conditions.