摘要
矿井采煤对地下水环境的影响主要为对具有供水意义的含水层水位及水量产生影响,确定采煤引起地下水水位降及漏失量是煤矿地下水环境影响评价的关键。以纳林河矿区某大型矿井为例,运用Visual MODFLOW建立模拟区地下水流数值模型,利用实测流场和长观孔的动态观测资料识别和验证数值模型,利用模型来预测采煤对第四系-白垩系含水层水位及水量的影响。模拟结果显示:前25年采煤引起地下水最大水位降为3.6 m,引起地下水的漏失量最大为141.87万m^3/a,占矿井涌水量的29.88%;利用矿化度法确定的越流量占矿井涌水量的6.39%~34.89%,模拟结果基本合理,可作为矿井采煤对地下水环境影响的研究依据。
The impact of coal mining on groundwater environment is mainly to affect the water level and water volume of aquifers with water supply significance,therefore, determining the groundwater level drop and leakage caused by coal mining is the key to the environmental impact assessment of coal mine groundwater. This paper takes a large mine in the Nalinhe mining area as an example, using Visual MODFLOW to establish a numerical model of groundwater flow in the simulation area, Identify and validate the model numerical model using measured flow field and the dynamic data of long-term observation well,finally, the model is used to predict the influence of coal mining on the water level and water quantity of the Quaternary-Cretaceous aquifer.The simulation results show that the maximum water level of groundwater caused by coal mining in the first 25 years is reduced to 3.6 m, causing the maximum loss of groundwater to be 1.418 7 million/a, accounting for 29.88% of the mine water inflow. The more flow rate determined by the mineralization method accounts for the mine. The water inflow is 6.39%~34.89%, and the simulation results are basically reasonable. It can be used as the research basis for the influence of coal mining on groundwater environment.
作者
刘晓宇
LIU Xiao-yu(CCTEG XI'AN Research Institute, Xi'an710054 , Shaanxi, China)
出处
《地下水》
2019年第3期17-19,85,共4页
Ground water
关键词
采煤
地下水环境
数值模型
水位降
漏失量
mining
groundwater environmental
numerical model
groundwater level drop
the leakage amount
