59 / 2023-05-15 22:35:22

Identification and control of spontaneous combustion of coal and gas composite disaster: a case study in the Luwa coal mine, China

Coal spontaneous combustion,Composite disaster,Hazard area determination,Slurry seepage,Paste consolidation and quick-setting material

Spontaneous combustion of coal and gas composite disaster is a natural hazard during mining. In China, coal mining has entered the stage of deep mining at present. In the deep mining, it is easier to accumulate heat, coal spontaneous combustion, and then trigger gas explosion. In this paper, the geological condition and actual situation of track chute in 4311 working face of Luwa Coal Mine were modeled, the grout seepage field, oxygen migration field and gas migration field were coupled, the concentration distribution of gas and oxygen in 4311 working face and overlying goaf was simulated, and the dangerous area of coal spontaneous combustion and gas combined disaster was determined. The grouting simulation is continued under this condition. The simulation results provide a theoretical basis for grouting prevention and control of coal spontaneous combustion and gas combined disasters. The application of paste consolidation and quick-setting material in the identified dangerous areas of coal spontaneous combustion and gas composite disaster has been proved to be an effective measure to prevent coal spontaneous combustion and gas composite disaster, because after grouting, the gas content decreases significantly, and the detected gas concentration is basically no more than 30%, and will be stable at a low level of 0 gas concentration.