Griadushchyi V. Development of the methods of explosion safety rising at the coupling of lavas with ventilating excavations in conditions of column working system

The analysis of existing ways and means of high gas concentration, flashes and methane explosions prevention in the deadlock part of ventilating excavation and at the point of its coupling with clearing face is made, their efficiency is defined. It is shown, that normative documents and existing ways of methane tap from canceling deadlock of ventilating excavation do not provide reliable forecast of air-gas conditions and safety of mountain works conducting. On the basis of theoretical air-gas dynamic researches of deadlock by numerical methods of mathematical physics and convective-diffusion transfer of the gas fluid the discrete imitating model for researching of laws of formation of explosive volumes of the gas fluid is developed. It is established, that leaks of air from the developed space at border with a lateral deadlock surface are stratified on methane concentration level and arrive to the deadlock in jet expiration form with a parabolic trajectory. Experimental fan-ejection installation (FEI)sample is developed and tested, its rational aerodynamic parameters and application area are defined. The influence of local ventilation fan, air leaks in the pipeline, ejection factor to aerodynamic parameters of excavation sites is established. The dissertation results are realized in the program "Deadlock gas-mode", the experimental FEI and offers for Standard "Designing of coal mine ventilation". Keywords: gas extraction, canceling deadlock, forecast of gas-conditions, fan-ejection installation, works safety.