The Safety Evaluation Study Of The Ventilation System In Coal Mine Based On A Theory Of The Unascertained Measure

The ventilation system in coal mine is a complicated human-machine-environment one with multi-factor, multi-variable, and multi-level. Therefore, it related to a lot of unascertained information in its safety evaluation. On the basis of analysis about the advantages and disadvantages of random information, fuzzy information, gray information and unascertained information in the paper, the unascertained measure theory was fetched out and applied into the safety evaluation in ventilation system of coal mine. It was put in practice that the safety evaluation based on the unascertained measure theory in ventilation system in colliery, the important problem is that establishing an index system of the safety evaluation and ascertaining its weight. The index system of the safety evaluation for the ventilation system in coal mine was established according to any practical experience and 4M method after the principia of establishing an index system and the relation of the index levels were analyzed in detail, then the safety grade of all indexes were plot out and the standard about them was given out in the paper. Due to the fundamentality about the influence of the index weight for the evaluation result, it is certain for bringing on different project of making weight, which affects the evaluation result. A count means with message entropy theory was introduced in the paper, which can ensure the index weight of ventilation safety evaluation in colliery. It makes count of weight value become more scientific and reasonable. These weight value ensured by it can show the important extent of each index. Finally, according to the unascertained measure theory, author sets up a model of evaluation index system about ventilation safety in coal mine and constructed some unascertained measure function of each index. He can judge the grade ventilation safety in colliery if the credible degree rule is cited after work out value of the unascertained measure. This paper applies evaluation method of unascertained measure into Tong Jiangqu Second Mine in Da Liuta town and points out its safety grade. Exemplification proves that this one is easy to operate and has better effect. Hence, it can be applied widely in the safety evaluation of ordinary colliery enterprises because it makes the colliery safety evaluation more practicable and scientific.