Research On Gas Disaster Risk Assessment Based On Uncertainty Measurement Model With Improved Recognition Criterion

The gas disaster which causes serious casualties and economic loss has become the primary task of major hazard control in coal mine.In order to identify and assess gas hazard objectively,and further clarify the measures and efforts of gas disaster prevention,the gas disaster in mining face is taken as a research object in this paper,the hazard of gas disaster is systematically analyzed and the risk assessment index system of gas disaster is established.According to that,the gas disaster risk assessment model in mining face is built with uncertainty measurement and grey relational theory,aiming to provide a new idea for gas disaster risk assessment.First of all,as the support of disaster system and dangerous sources,the gas disaster in mining face was taken as a disaster system and the gas hazard was analyzed from three types of dangerous sources.Combined with the principles of assessment indexes and the attributive association between risk factors,the multi-level assessment index system for gas disaster in mining face was established and the indexes were extracted from the aspects of gas,coal seam,structure and depth,equipment,technical effect,monitor and control management,personnel management,system management and so on.Then the classification criteria and weighting method of indexes were determined.Secondly,uncertainty measurement and grey theory were applied to gas disaster risk assessment in mining face,and measurement functions were constructed according to the multi-level index system and index classification criteria,then the single index measurement and comprehensive indexes measurement were calculated.The grey correlation degree was applied to improve the defect that judging risk levels by credible degree recognition,and the uncertainty measurement risk assessment model with grey correlation degree recognition criterion for gas disaster in mining face was established.Finally,the uncertainty measurement model of gas disaster in mining face was used to a coalmine in Shanxi and the emphases in gas prevention and control were evaluated according to the results.The model can be used for quantitative evaluation of gas disaster risk.Without considering sample size,the model is simple and feasible,and the improved model which has more objective results is worthy promoting in disaster risk assessment.