Application Of Groundwater Flow Numerical Simulation Method In Early Warning Of Karst Collapse In Linyi

Groundwater is an important part of the ecological environment,and is also a valuable natural resource.The karst groundwater was the main water supply source in Linyi city.With the long-term unrational exploitation and utilization of the groundwater,the water level was greatly reduced.The landing funnel began to appear in the 80 s of last century.The water level of the funnel area is lower than the bedrock roof.Serious karst collapse is a great threat to the safety of people's lives and property.In this paper,based on the Linyi monoclinic,the relationship between the change of karst groundwater flow field and the karst collapse is studied on the basis of the analysis of the local stratigraphic conditions.A numerical model of groundwater is constructed to predict the change trend of the flow field,to evaluate the risk of the karst collapse,and to establish the early warning system for the karst collapse according to the above research results.And the prevention and control plan of karst collapse is determined.The following research results have been obtained:(1)mastered the dynamic evolution rule of karst groundwater in Linyi city and the development process of the funnel.(2)through the analysis of the relationship between karst collapse development and geological conditions and the temporal and spatial variation of groundwater,the formation mechanism of karst collapse has been identified.(3)through the construction of numerical model of groundwater flow,the change of groundwater flow field in Linyi urban area under different mining schemes is predicted,and the risk of karst collapse is evaluated by the analytic hierarchy process.(4)coupled with the numerical model of groundwater flow,the result of risk assessment and the monitoring information collection system,the early warning system of karst collapse in Linyi is constructed.Through the analysis and research of scientific system,the understanding of the formation mechanism of karst collapse in Linyi city is strengthened.At the same time,the scientific and effective prevention measures for karst collapse are put forward through the exploration of karst collapse monitoring,early warning and prevention,which provide technical support for the prevention and control of karst collapse in the urban area of Linyi.