Research On Mechanism And Early-warning Of Coal Mine Gas Explosion Accidents Based On Three-Type Of Hazards Division

Gas accidents are the leading causes of deaths in China coal mines. The gas explosion hazard system is a complex socio-technical system which is composed of people, machines, matter and management factors. So it would be urgent to solve problems in coal mine production process such as comprehensive and systematic identification of all kinds of hazards, gas explosion mechanism, and early-warning of gas explosion accidents. This paper provided a new theory exploration on gas explosion prevention and early-warning with great significance on theoretical value and practical meaning. Main contents were as follows.①This paper redefined the three-type of hazards division theory and discussed the complexity of gas explosion hazards system. It considered that the gas explosion system was dynamic, complex and had characters of a dissipative structure. It constituted the interpretive structural model of gas explosion three-type of hazards system based on interpretive structural modelmethod, and analyzed the structure elements of the system by establishing adjacency matrix and reachable matrix, then it reduced hazards into four levels in term of effect degree on gas explosion, which laid foundation for research on gas explosion mechanism and self-healing control of gas explosion hazards early-warning.②Gas explosion mechanism concluded occurrence, development, evolvement and emergency process by Mechanism Methodology. It analyzed principle mechanism, theory mechanism and process mechanism such as occurrence, development and evolvement process. It figured that dynamic and feedback interaction among three-type of hazards in coal mine production resulted in occurrence, development and evolvement of gas explosions.③It put forward the self-healing control mechnism of gas explosion hazards early-warning as well as the definition, principle and function of the self-healing control mechnism. This mechnism should be carried on by control and regulation of three-type of hazards. Then the objects, target system and content of gas hazards early-warning were explained. The early-warning model of three-type hazards in coal mines was established which provided a model basis for the following early-warning methods study.④Three corresponding early-warning methods were put forward aiming at different characteristics of three-type of hazards in coal mine gas explosion. As for the first type of hazards, it set up an early-warning model based on fuzzy multi-sensor data fusion. As for the second type of hazards, it constituted connection degree function formula cluster based on Set Pair theory, and the early-warning method on the second type of hazards based on connection degree of Set Pair Analysis was put forward. As for the third type of hazards, using the Entropy Theory and Harmony Theory for reference, the concept and formula of harmony entropy was put forward, and the third type of hazards early-warning method was set up by harmony entropy analysis. Examples validated that three different early-warning methods were feasible. Research on early-warning problems from angles of Entropy Theory and Harmony Theory opened a door to the study of human errors and organization early-warning.⑤Preliminary index system of gas explosion three-type of hazards early-warning was set up by inducing and decomposing of drive factors for gas explosion. The software Rosetta was used to reduce indexes by application toolbox of Rough Set theory, and it made 60 primary early-warning indexes into 54 and reduced computing work. It designed variables and the model by applying Structural Equation Model (SEM) approach. Surveys were carried out to collect data. AMOS 7.0 software was used to test whether the model was fitting or not. Hypotheses of interacting mechanism among three-type of drive factors in gas explosion hazards system, while the path coefficients between hidden variables and significant variables were computed to support those hypotheses. Drive factors compositor according to their effect relation proved that three-type of hazards did interact with each other and the third type of hazards were the principal factors. Finally it tested the rationality of early warning index system.⑥Structure of coal mine gas explosion hazards early-warning system was designed. The function and early-warning process of three subsystems were analyzed. Then it set forth the case express, case-based retrieval arithmetic, case study and revision steps which provided a basis for information implementation of gas explosion early-warning system.