Study On Slope Stability And Ecological Management Of An Abandoned Mine In Lishu County,Jilin Province

China has rich mineral resources,mineral exploitation for economic development has made an important contribution.However,with the promotion of sustainable development,the concept of "green mountains are gold and silver mountains" has won the hearts of the people,and the public has gradually realized that such a highconsumption,low-output economic development mode cannot be sustained.At the same time,under the guidance of "ecological civilization construction",all parts of the country actively responded to national policies and closed down mines that seriously damaged the ecological environment.However,the closed mines became abandoned land without treatment,which not only caused serious damage to the local ecological environment,but also caused a lot of geological disasters hidden dangers due to the complex geological conditions and unreasonable mining methods of the mines,which seriously affected the quality of life and property safety of local residents.In the short term,it is difficult to repair the damaged ecological environment by relying only on natural conditions,so it is very important for human participation to accelerate the process of ecological environment restoration.Lishu County,Siping City,Jilin Province used to be an important source of limestone and wollastonite minerals in the province.The abandoned mines within its territory caused serious damage to the local ecological environment due to the early disorderly mining,such as rock exposure,vegetation degradation,mining waste residue accumulation and other geological environment problems.Therefore,it is urgent to carry out ecological management of abandoned mines in this area in order to eliminate geological hazards,improve ecological environment and enhance the value of land resources.Based on "ecological management Project of abandoned Mine in Lishu County,Jilin Province",the stability of abandoned mine slope in Lishu County was analyzed,and the ecological management scheme of abandoned mine was put forward.The results can provide a scientific basis for the ecological control engineering of abandoned mines,and also provide a reference for similar abandoned mines.The main work and achievements of this paper are as follows:(1)Based on the existing geological data and field investigation results,find out the environmental geological conditions of abandoned mines and engineering geological characteristics of slope,and analyze the development of slope joints and possible deformation and failure modes.(2)The environmental geological problems existing in abandoned mines are clarified and the stability of slope is qualitatively analyzed by graphic method.At the same time,the relevant data of slope treatment technology and ecological environment restoration technology are sorted out,and the corresponding abandoned mine treatment plan is put forward.(3)The finite difference method and strength reduction method are used to conduct quantitative analysis of slope stability,simulate the distribution of slope displacement and maximum shear strain under the condition of dead weight,calculate slope stability coefficient,and verify and supplement the results of qualitative analysis.(4)According to the treatment principle of "technically feasible and economically reasonable",a comprehensive treatment scheme of "mine slope treatment(slope cutting and shaping + slope drainage)+ ecological environment restoration(ecological greening + landscape design)" is put forward.By calculating the safety factor,it is concluded that the stability of mine slope after treatment conforms to the standard requirements.