Poset-based risk identification method for rockburst-induced coal and gas outburst

Abstract

The aim of this study was to address the problem of weighting disputes in the evaluation of rockburst-induced coal and gas outburst as well as to improve the rationality and accuracy of the risk identification results. Hence, we developed a risk identification method for rockburst-induced coal and gas outburst, considering the influence of multiple factors based on poset decision-making theory. The risk identification index system was established according to stress factors, gas factors, and physical and mechanical properties of coal, including 12 indexes and 4 risk grades. The poset adopted implicit weighting to store the weight information. The proposed method was applied to identify risks in an engineering case study. Thus, we determined the outburst risk grade and compared the case study results with the actual situation of the working surface. The comparison and analyses showed that the outburst risk grade of the case study working surface under gas factors was grade Ⅱ, the outburst risk grade under stress factors and the physical and mechanical properties of coal was grade Ⅲ, and the outburst risk grade under comprehensive factors was grade Ⅲ. The results of the risk identification of rockburst-induced coal and gas outburst based on poset were consistent with the results obtained by the method used in the case study and the actual situation of the working surface. This study extends the methods for accurately identifying risks of rockburst-induced coal and gas outburst and facilitates the formulation of effective preventive measures.