Study On The Risk Assessment Of Mine Geological Disasters In Northeastern Yunnan Province

In today's rapid development of social and economic level,the demand for mineral products is increasing,thus increasing the development and utilization of mineral resources,to a certain extent,to break the balance of the geological environment.At the same time triggered a collapse,landslides,debris flow and other mine geological disasters,threatening the development and utilization of mineral resources and nearby residential areas.Therefore,it is an important work and urgent requirement to carry out the research on the hazard assessment of mine geological hazards.By choosing Northeast Yunnan as the research area,this paper has collected the data about the remote sensing image,mining rights and the background of geological environment.By means of remote-sensing human-computer interactive interpretation,this paper has analyzed the current status of the development and exploitation of mineral resources as well as the development of geological hazards in the research area.Some factors,such as evaluation precision and computer performance,have been taken into consideration.The research area has been divided into numerous evaluation units of 4km×4km.The information quantity method and weighted average method have been utilized to evaluate the risk of geological hazards in the mine.The research achievements are as follows.(1)The regional background characteristics of northeastern Yunnan were systematically studied,and the formation conditions and hazard factors of mine geological hazards were obtained.(2)The current status of the development and exploitation of mineral resources as well as the development of geological hazards in the research area has been analyzed.The laws of spatial distribution and the features of the development of geological hazards in the mine have been also concluded.First of all,with the data of high-resolution remote sensing images,this paper has analyzed the development and exploitation of mineral resources as well as the development of geological hazards in the research area by means of remote-sensing human-computer interactive interpretation.The field survey has been conducted on the site of mine geological hazard which is interpreted indoor.Based on the data and materials about geological hazard gained in the field survey,the results of indoor interpretation have been corrected accordingly.Hence,the development and exploitation of mineral resources as well as the development of geological hazards in the research area have been concluded.(3)In view of the formation condition of mine geological hazard and the features of hazard development,this paper has chosen 8 evaluation indicators as the index factors,namely hazard site density,slope degree,slope height,fault,stratum lithology,vegetation,rainfall and mining activities.In addition,the index system for the risk evaluation of mine geological hazards in Northeast Yunnan has been built.The preliminary index system suitable for the risk evaluation of mine geological hazards in Northeast Yunnan has been formed.Hence,it can provide some reference for the research into the risk evaluation of mine geological hazards in the similar areas.(4)The information quantity method and weighted average method have been adopted as the model to evaluate the risk of mine geological hazards.According to the risk level of mine geological hazards in Northeast Yunnan determined by the information quantity method,the research area can be divided into 8 highly risky areas,7 moderately risk areas,5 slightly risk areas and 2 risk-free areas.According to the risk level determined by the weighted average method,the research area can be divided into 8 highly risky areas,5 moderately risk areas,5 slightly risk areas and 5 risk-free areas.(5)As shown by the comparative analysis on the evaluation results of the two models,they are basically consistent with each other.It has also proved the effectiveness of the evaluation index system for mine geological hazards.The empirical analysis and comparative research on those sub-areas in the information quantity method have been made.The development features and formation environment of mine geological hazards in those sub-areas have been also concluded.(6)Based on the evaluation result of the risk of mine geological hazards in those sub-areas of Northeast Yunnan,this paper has offered some feasible advice on preventing and controlling the mine geological hazard.