Prediction And Analysis Of The Influence Of Anli Open Pit Coal Mining On Groundwater Quantity And Quality

The development of coal resources is an important foundation for th e development of China's economic industry.With the development of coal resources,the destruction and pollution of groundwater resources caused by mining is increasing.Open-pit mining is a kind of serious impact on groundwater in coal mining methods.Based on the scientific problems of the impact of coal mine open-pit mining on groundwater resources,this paper carries out the research on the status quo,simulation prediction and protection measures of groundwater impact on the groundwater impact of the Qidujing Anli coal mine open-pit mining project of Ordos Hongsen Mining Co.,Ltd.This paper investigates the water level of centralized water supply wells,decentralized karst water supply wells in the project area,and the current situation of mine water inrush in Qipanjing Mine and Yuan'an Coal Mine.The results show that the karst water volume and water level are continuously decreasing,the total hardness of water quality,The total dissolved solids and sulfate index exceeded the standard.The coal mine has a greater impact on groundwater during the three periods after the construction,operation and service period.In this paper,a numerical model of groundwater in the project area is established to analyze and correct the groundwater numerical model.The groundwater numerical model is used to calculate the amount of karst water resources,and the method of replenishing and discharging the karst water in the project area is analyzed.It is concluded that there is no direct fault damage to the karst wate r aquifer in the open-pit mining of the project,but there is a risk of pollution to the karst water aquifer.During the construction period,the impact of the project on groundwater mainly comes from the damage of the ditch aquifer in the first mining are a,and the production domestic sewage will only pollute the groundwater environment in the accident state;during the operation,the coal mining and industrial site drainage will Damage to the aquifer,but will not destroy the karst aquifer;after the expiration of the service period,when extreme conditions such as rain and flood occur,the rainwater leaching will pollute the karst groundwater in the pit and the outburst.This paper proposes corresponding protection measures for the impact of open pit mining on the groundwater environment.Before the construction of coal mines,rational planning and utilization of limited groundwater resources;different treatment measures for mine drainage and industrial site production and domestic sewage in the construction period and operation period to ensure the safety of groundwater quality;after the service period,use existing water supply wells or abandoned The water supply well serves as a monitoring point for regular inspection of the groundwater environment in the mining area.Later,it will provide reference for the protection of groundwater resources in open-pit coal mining projects.