| 摘要 |
FIELD: mining. SUBSTANCE: monitoring of the rock state in the process of working by a mining machine is carried out on the base of uninterruptible measuring and recording methane concentration for the nearby face space, and comparing it with critical concentration. With exceeded critical methane concentration, real value of gas release in the nearby face space and from broken coal is compared to the critical value for the given working, and gasodynamic index of risk is determined under the following formula:, where C, C, Care respectively methane concentrations before coal extraction, in 15 minutes after completion of the extraction, and maximum (per cent). EFFECT: high reliability in monitoring rock state. 1 dwg |
