Study On Nonlinear Characteristics Of Accident Evolution Of Gas Explosion And Risk Assessment In Coal Mine

In China, coal is the most important development energy. Coal will be the primarily energy for a very long time. In coal mine, the gas explosion accident results in the biggest economic losses and most casualties, and it also caused the greatest social badly impact. The gas explosion accident was still restricts the production safety in coal industry.Based on the therories such as safety science, mine ventilation science, non-linear science, system engineering, mathematics and computer science, etc, this paper research on the following issue by combination of theoretical anlaysis and literature research and field data collection and computer applications.(1) The base characteristics of gas explosion accident such as gas accumulation, fire source and location of explosion accident was analyzed and classified through the main impact factors of the gas source and a large number of coal mine gas explosion accidents. The characteristics and law of the gas explosion accident and Cross-coupling characteristics and law of the gas explosion accident were analyzed based on 563 gas explosion accidents from 1988 to 2008.(2) Combination of the Cause of the accident theory, the "human-machine-environment-management" model of the accident evolution of coal mine gas explosion was established, the unsafe human behavior and the unsafe machine state was analysis. the unsafe human behavior was dividing into four major that include 33 sub-categories. The four major unsafe human behaviors are neglect of safety or operational errors; use of unsafe equipment or resulting in failure of safety devices; dangerous work; and other unsafe human behaviors. The unsafe machine state was dividing into four major categories that include 40 sub-categories. The four major unsafe machine states are without protection or protection deficiencies, equipment or facilities or tools or accessories defective, adverse environment, and other unsafe machine states. The characteristics and law was analyzed based on 100 gas explosion accidents from 1988 to 2008.(3) Nonlinear characteristics of accident evolution of gas explosion were analyzed based on accident causation theory. The function of coal mine production systems as the state parameters of the system, and the human factors and machine factors as the parameters system control, a cusp model of accident evolution was established. This cusp model shows that: the accident evolvement is a rheology-catastrophe process, the degree of catastrophe reflects severity of accident, the unsafe behavior is a major factor in the accident, accident severity determined by factors of substance, safety production must be intrinsically safe mine, and to avoid the movement trajectory of human's unsafe behavior and machine's unsafe state crossing the bifurcation point set.(4) The traditional risk assessment of gas such as the form of security check method, the gas disaster indicators score evaluation, operation of regional gas explosion risk assessment and safety evaluation method, the tunnel gas risk assessment methods and models, as well as problems of them were analysis. According to the evolution of gas explosion accident analysis model, the gas risk assessment index system that divided into 4 categories and 27 sub-categories that include human quality, machine, environment and management factor was established. The classification structure and name of various level indexes was introduced in detail. The interzone methods of the qualitative and quantitative indicators were put forward.The accident evolution of gas explosion was in multifactor, multivariable, multilevel, complex non-linear system. Based on analytic hierarchy process and grey theory, the non-linear multi-gray-level risk assessment mode was established. The risk assessment procedures and steps were described in detail. A risk assessment example of gas was give. The Evaluation results in line with the actual situation.(5) The software, gas explosion accident management information system and risk assessment of gas explosion in coal mine, was researched and developed. The management information system includes characteristics of coal mine information, characteristics of accident information, accidents, characteristics of accident evolution of gas explosion, basic coal mine information, basic gas explosion accident information, risk assessment index and risk assessment information, as well as other related information management. The management information system can output various visual query graphs.Generally speaking, the research on gas explosion accident evolvement characteristic and law, as well as the effective accident prevention and control theory and technology will helpful to establish long-acting safety mechanisms, to improve the situation of coal mine, to advance the field of mine safety production of scientific and technological progress, to improve coal mine's disaster prevention and to promote the sustainable development of the coal industry.This thesis was supported by Project 50774033 Supported by National Natural Science Foundation of China, and was supported by the Key Project of Chinese Ministry of Education (206100), and was supported by A Project Supported by Scientific Research Fund of Hunan Provincial Education Department (05A013)...