| Vanadium is known as the “vitamin”in the mental field,which is widely used in the aerospace,chemical,batteries,paint,glass,optics,medicine and many fields.As a key vanadium mining area,shanyang-Shangnan vanadium ore belt has an increasingly strong mining intensity,which caused frequent geological disasters for residents and staff of mining enterprises It also posed a threat to mining environment.The thesis is based on the project "Study on concealment of mine geology hazard identification and hazard mechanism of Qinling concentrated mineral resources exploration area",taking Wuzhou mining area in Zhongcun town,Shanyang county,Shangnan vanadium mine belt as the study area.Through the collection of data and field geological survey,briefly introduced the natural geography,the history and present situation of exploitation,disaster environment and the present development of geological disasters.It is the foundation for subsequent research work.The main research methods and results are as follows:(1)The influence of mining activities on the slope stability is mainly reflected in three aspects: mine excavation,gob and blasting,the thesis explored the influence of mining activities on the slope stability on the basis of analytical and numerical method.With the help of Midas GTS,established different sizes of mine and models in different position of the slope to have a simulation calculation.By contrasting the simulation results with no-roadway excavation model simulation results,gained the effect of roadway excavation and gob on slope stability.At the same time,used analytical method to analyze the permissible safety distance and the influence radius.Thus,judged whether blasting have an impact on slope stability.(2)Summarized the slope structure,type and failure modes in the research area.Meanwhile,taking Jinshijian instable slopes as an example,analyzed the causes of slope deformation and instability on the basis of field investigation.With the help of Midas GTS,only on the condition of geostatic stress,calculated the initial in-situ stress balance before exploitation is carried out,and reset the displacement.Subsequently,on the condition of underground mining,carried out the numerical simulation of Jinshijian unstable slopes,analyzed the displacement,stress and plastic zone development characteristics.(3)On the basis of comprehensive understanding of basic principles and common evaluation methods of geological hazards,combined with the main factors affecting geological hazards in the study area,adopted ahp to evaluate the geological hazards in the study area.Firstly,constructed the index system of geological disaster risk assessment in the study area.Then,based on the analytic hierarchy process(ahp),established a mathematical model of geological disaster risk assessment suitable for research area.With the help of spatial analysis function of ArcGIS,obtained the geological disaster risk assessment results of the mining area.Based on the analysis of the evaluation results,the geological disaster risk was divided into three levels: low risk,medium risk and high risk,and summarized the characteristics of the corresponding region of each level. |
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