Research On Risk Assessment Of Debris Flow In Pulang Copper Min

With the continuous deepening of mining level of natural caving method,the area of surface collapse pit is gradually expanded,and the surface fine particles moraine and debris enter the collapse pit with rainfall.Under the influence of mining disturbance,the possibility of underground debris flow disaster is also increasing.The resulting harm will not only cause equipment damage and casualties,but also affect the normal mining of mineral resources,resulting in a great waste of national resources.In order to control the risk of underground debris flow disaster,reduce the possibility of underground debris flow disaster,reasonable evaluation of underground debris flow disaster,and then take effective prevention and control measures for underground debris flow disaster.The main research contents of this paper are as follows:(1)The relationship between natural caving mining method and underground debris flow disaster is analyzed,the characteristics and rules of underground debris flow are summarized,the formation conditions of underground debris flow are studied,the formation process of underground debris flow is analyzed and the disaster chain of underground debris flow is constructed.(2)On the basis of underground debris flow disaster chain,the risk factors of underground debris flow are identified by the grounded theory,and the index system of underground debris flow risk factors in Pulang Copper Mine is established,which consists of 17 risk factors in four levels,namely source condition,channel condition,water condition and other factors.According to decision laboratory analysis(DEMATEL),the top five risk factors of centrality are A13(drainage control capacity),A8(atmospheric rainfall),A2(surface subsidence pit form),A12(subsidence pit water)and A9(surface runoff).Through the interpretation of structural model(ISM),the multi-level hierarchical structure model of risk factors of underground debris flow is constructed,and the surface factors,transition factors and root factors leading to underground debris flow disasters are analyzed.(3)Expert scoring method is used to score the selected risk factors of underground debris flow,AHP is used to calculate the index weight of underground debris flow risk factors,fuzzy comprehensive evaluation method is used to comprehensively evaluate the risk of underground debris flow,and it is calculated that the risk degree of the study area is a higher level of risk,and measures need to be taken to reduce the risk level.(4)Combined with the above research results,based on the formation conditions and disaster chain of underground debris flow,and closely combined with the multi-level hierarchical structure model of underground debris flow risk factors and the fuzzy comprehensive evaluation results of Pulang Copper Mine,the corresponding chain breaking measures are formulated,which has strong practical significance for the prevention and control of underground debris flow disasters.The research results can provide reference for the safety management of the first mining area of Pulang Copper Mine and provide theoretical support for the safe and sustainable production of mining enterprises.At the same time,the model and method established in the paper can also be applied to the similar mines,which provide a new method and way of thinking for our country’s mining enterprise risk assessment.