ABSTRACT
The coupling disaster of coal and gas outburst and rockburst has become a difficult problem and bottleneck in the treatment of gas-dynamic disaster in deep mines. Taking the kilometer deep well as an example, the characteristics of coal and gas burst complex dynamic disaster in the first mining of coal seam 11-2 are studied and determined; based on the rockburst and the disaster causing factors of coal and gas outburst, the comprehensive index method and gas geological method are used to predict that there are four dynamic disaster risk areas in the working face. According to the principle of “regional prevention first, local treatment and supplement”, the composite prevention measures such as large-diameter borehole pressure relief, coal seam water injection, and bedding borehole pre drainage are tested. The results show that the maximum amount of drilling cuttings in the mining area is 4.4kg/m, the gas concentration in the return airflow is maintained below 0.45%, and there are no accidents of exceeding the prediction index and gas exceeding the limit, which realizes the accurate prevention and control of zoning and grading of mine dynamic disasters and safe mining of the working face, and effectively prevents the occurrence of compound dynamic disasters.
