Study On Process And Mechanism Of Water Rebound Impact On The Regional Groundwater Flow Field In Abandoned Mines

The exploitation and utilization of mineral resources greatly contribute to the progress of human civilization.Today,with the constant increase of mining depth and the expansion of the breadth,the number of abandoned mines increases sharply,With the changing of government's policy low capacity and high consumption coal mines also accelerate the speed of shutting down.After stopping the production of the mine,the degree of groundwater level influenced by human disturbance is reduced,goafs and roadway system are gradually overwhelmed easily which leads to a series of geological disasters.In this paper,Fengfeng abandoned mine of Handan is considered as the study area,we analyzed the local hydrogeological conditions,the source of water filling of abandoned pit.Then,we study the process and mechanism of backwater,combing with the characteristics of mining.Also,the evolution of groundwater flow field is comprehensively analyzed on the condition of filling water.The main findings are as following:(1)The methods of water chemistry and isotopes are combined with the actual hydrogeological conditions of the study area to analyze the origins of water filling of abandoned Fengfeng mine,and the characteristic of different aqueous medium?spatial distribution and groundwater flow field are studied in abandoned mine systems.The medium field of abandoned mine water is divided into pipe flow and equivalent continuum medium,the mechanism of groundwater backwater process is simulated.(2)Groundwater dynamics characteristics of abandoned mine is fully analyzed,and feflow(groundwater flow modeling software)is combined with C++ secondary development to analyze the groundwater back curves of mine that merged by mine one?mine two?Quantou mine after abandoning,the simulation result is consistent with the observed data.(3)Combing with the characteristics of regional groundwater flow field,this paper analyzed the evolution of regional groundwater flow field of Fengfeng mine in different periods.With selection of suitable initial flow field and displacement data,the impact on the regional groundwater flow field caused by abandoning the mine is simulated.Through systematic study,we gain deep understanding of the abandoned mine structure and the recovery process of backwater.This study may significant on more reasonable simulation method is formed.The basis and technical support on geological environment protection of the mine and reduce hazards of abandoned mine and make the resource utilization after closing the mine.