Superposition risk assessment of the working position of gas explosions in chinese coal mines

Abstract

The prevention of gas explosion accidents is a key factor in enhancing the safety of production of coal mines. The effective management and control of the working position risks is of great significance for the prevention of such accidents. By analyzing data from 201 typical gas explosion accidents, 21 working positions related to the accidents were identified along with the main causing factors. By employing data statistical methods, the structural importance analysis method of fault tree analysis, and the summation method, the risk associated with each working position was evaluated. Then, this work built a risk assessment matrix to categorize risk levels associated with various working positions related to gas explosions in coal mines. Also, based on the kernel density analysis, a superposition risk assessment model was established. In addition, the ArcGIS software was used to simulate and calculate the superimposed risks and draw a risk distribution map. The results show that the number of working positions of Level I is mainly affecting the fully mechanized mining team, the fully mechanized excavation team, and the ventilation team. The risk distribution map intuitively shows that the high-risk working positions involving gas explosion accidents in Chinese coal mines mainly exist in the working face and the tunneling face. It is highlighted that the working position risk and grade distribution have a significant hierarchy after risk superposition.