Analysis And Optimization Of The Technical Scheme Of Reflow Of Jinci Spring

Jinci spring is a famous karst spring in the north with natural flow of 4.5m~3/s.In recent years,due to artificial activities and climatic factors,the water level in the spring area continued to decline,and the Jinci spring was broken down in 1994.In order to ensure the synchronous development of the social,economic and ecological environment construction,the Shanxi provincial government has brought the complex flow of the broken karst spring in the Fenhe River basin into the ecological restoration plan of the Fenhe River Basin,and the reflow of Jinci spring in the basin is one of the important contents.Through collecting the relevant data in the study area,this paper studies the geological conditions,hydrogeological conditions and other influencing factors of the Jinci spring area,and establishes a geological structure model,which directly shows the conditions of the occurrence of karst groundwater in the region.The groundwater flow model is established by using FEFLOW numerical simulation software based on finite element method.The boundary dividing line between the Jinci and Lancun springs is a movable underground water and water ridge boundary,and the sangei horst is located in the dividing line of the two spring fields,so there is a close hydraulic connection in the karst water.Therefore,the scope of the karst groundwater flow migration model should include two springs:Jinci and Lancun.During the establishment of the model,the observation points are fitted to ensure that their errors are within reasonable limits.This model is used to simulate the current situation and various schemes,and forecast and evaluate its influence on the karst water level and the reflow effect of the spring.7 measures are adopted to establish the technical model of the Jinci spring reflow,including increasing the leakage of the section between Luojiaqu and Longweitou,increasing the leakage of the Fenhe River,the near source recharge,the closed some wells,the blocked self flowing well,the pressure mining coal mine and the pressure mining Lancun water source area.Each measure was simulated individually,and the time required for each measure to correspond to Jinci spring reflow and ecological reflow was observed and compared.Based on the above 7 measures,2 different reflow schemes are worked out.In scheme one,5 measures are adopted to increase the leakage of the Fenhe River,the near source recharge,the closed some wells,the plugging of the self flowing well and the compression mining.The Jinci spring reflow has been used for a short time and can be realized in 1459th days.In scheme two,4 measures are adopted to increase the leakage of the Fenhe River.the closed some wells,the plugging of the self flowing well and the mining coal mine,so as to reduce the supply of the near source and reduce the project input,but the time used by the Jinci spring reflow is relatively long.