Risk Assessment and Prevention of Underground Mine Debris Flow Based on Combination Weighting-Matter Element Extension Model
When the natural caving mining method is used for mining,the underground debris flow disaster is prone to occur under the comprehensive influence of material source,water source,geology and other factors.In order to prevent and control the underground debris flow of a copper mine in the plateau area,analyzing the underground debris flow disaster chain induced by rainfall-pulp-surface collapse-channel,a risk assessment index system including 5 first-level indicators and 22 second-level indicators was established.Firstly,the importance score results of the indicators were collected from the experts in the field,and then the weights of the evaluation indicators were calculated by the combination of entropy weight method and analytic hierarchy process.The risk level of underground debris flow and the risk level of each evaluation indicators were evaluated by matter-element extension model.Finally,combined with the weight mean of each indicator and the evaluation results of the matter-element extension model,the key prevention and control of high-weight and high-risk indicators were carried out.The results show that the risk level of underground debris flow in the mine is high,among which the risk degree and weights of rainfall,moraine fragmentation,emergency disposal are ranked a bit high.The proposed control measures can reduce the risk degree,thereby reducing the occurrence of underground debris flow,and providing effective guidance for the prevention and control of underground debris flow in the mine.
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