| Due to outdated measures of safety management are still allied in some coal mines, coal mine disaster especially roof collapse incidents happen from time to time. At this stage, licensed Risk Assessment Firms are very limited in numbers. Most of them are conducting high level system safety evaluations for coal mines and there is no way for them to carry out very detailed risk assessments for all workers and working locations. Same as other enterprises, 60%~90% of roof collapse incidents are caused by human error. Therefore, individual workers are major contributors to the safety for roof control. As individual workers are not licensed for conducting system risk assessment, they are not involved in any risk assessment process, even most worker have no assess to any system risk assessment reports issued by licensed Risk Assessment Firm.Aimed at solving the above mensioned problem, this thesis proposed a new safety management concept, ie all operators are involved in conducting field level, rapid risk assessment– 5-step method. The principle and procedures of usage are also discussed.The 5-step method combines the risk/hazard sources theory into roof collapse incident model, and an index system is proposed to evaluate the severeness of roof collapse incident potential. In the process of identification of risk/hazard, Improved Analytic Hierarchy Process is proposed. A mathematical model is established by means of applying the scoring system of various risk factor weights given by each expert, using this method and the participation of workers to evaluate risk factors. A final index or weight is determined and agreed by each member of expert team.In the five-step method of risk control, risk control decision is made according to safety leve. By using principles and methods of cybernetics, coal mine accident feedforward control, feedback control, and self-organizing control methods are proposed. In feedforward control, risk factor control, interaction control of risk factors methods are applied. In feedback control, three early-warning (red, yellow, green) control mode is proposed, and each level range is setted. Through the implementation of these methods, a closed-loop control in safety management is to be achieved successfully.Through analyzing the data collected from two coal mines (Long-quan and Da-ning coal mines) and applying the 5-step method on them, a significant result is achieved. It is hopefully that a new way is to be found for detailed safety management of roof hazard in coal mines.According to contents of the research, an application system for 5-step mothods is developed using Activex components, VB interface and Access database. The system includes registry sub-system, integrated management sub-system, analysis and decision support sub-system, security knowledge base sub-system, system management and exit off sub-system. The thesis shows the details of the system structure, system design, system functions and application conditions.
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