Risk evaluation of goaf coal spontaneous combustion by matter element model

Based on the extenics theory,the matter element model used to evaluate goaf coal spontaneous combustion risk was established,and the subjective dynamic weight about evaluation index was determined by simple dependent function method.The evaluation indexes and their level value ranges were constructed.The indeterminate sample was obtained by the actual conditions in 15101work face of a coal mine in Shanxi Province and the field and laboratory test results,and the sample was evaluated by matter element model.The research show that the evaluation result agrees well with the practical situations,and the determination of subjective weight can avoid the effect of human subjective factor.It is reasonable and feasible in evaluating goaf coal spontaneous combustion risk by matter element model.