Integrated study on compound dynamic disaster of coal-gas outburst and rockburst

Abstract

With the mining depth increase, some mine dynamic disaster shows the characteristics of both coal and gas outburst and rockburst. The two dynamic disasters are mutual coexistence, mutual influence and mutual composite. They are difficult to be defined as a single type of disaster. Thus, in this study, the concept of compound dynamic disaster of coal and gas outburst and rockburst was put forward. The unified mechanism of compound dynamic disaster was revealed, through the integrated theoretical research of compound dynamic disaster. Therefore, the unified criterion of instability was established. The dynamic disasters were divided into four types based on the exiting problems of current dynamic disaster classification. On this basis, for the type of mine compound dynamic disaster, the multi-target integration testing equipment of drilling bits method and the real-time continuous monitoring equipment of coal temperature and coal charge were innovated and developed. Also, the integrated classification and grading prediction technology of compound dynamic disaster were developed. For the mine compound dynamic disaster, the integrated prevention technology of compound dynamic disaster was proposed on the basis of intrinsic gas energy reduction and coal rock elastic energy release, which includes gas extraction, the deep hole blasting pressure relief of roof-coal-bottom breaking, coal seam water injection, et al.