徐州東部廢棄礦井地下水流場(chǎng)演化模擬研究
[Abstract]:Taking the abandoned coal mine in the eastern part of Xuzhou as an example and the limestone aquifer of Taiyuan formation as the research object, the evolution process of regional groundwater flow field is studied by establishing the groundwater flow system model in the abandoned mine area and using numerical simulation technology. It is revealed that the general law of the evolution of underground water flow field in the abandoned area of mine is that before the coal mine is closed, in order to meet the needs of production and daily life, a large amount of drainage and pumping work are carried out in the mine, and a number of falling funnels are formed in the For example, in Qingshanquan Coal Mine in the west of mining area and Hanqiao Coal Mine in the north, there is a large area of falling funnel, and the central water level is lower than -25 m. Under the influence of hydraulic gradient, groundwater accumulates into low-lying pits and the primary groundwater flow system is destroyed. After the pit is closed, the original drainage system stops working, the groundwater level rises slowly, and the drop funnel decreases gradually. According to the simulation results of the model, It was found that the recovery rate of water level slowed down with the increase of mine closing time: in the first year of mine closure, the rate of water level rising was 1.14 m / a; in the third year of closure, the recovery rate of water level decreased to 0.165 m / a; when the mine was closed for 10 years, the recovery rate of water level decreased to 0.165 m / a. The maximum groundwater level is -16.55 m. In the 7 years from the third year to the tenth year, the recovery rate of the groundwater level is only 0.039 m / a. The groundwater flow system in the mining area is restored, and the simulated area forms an approximately stable groundwater runoff field from north to south.
【作者單位】: 南京大學(xué)地球科學(xué)與工程學(xué)院;中國(guó)礦業(yè)大學(xué)資源與地球科學(xué)學(xué)院;
【基金】:地下水流數(shù)值模擬概念模型的不確定性分析(41302181) 水利部科技推廣計(jì)劃項(xiàng)目“徐州礦井廢水綜合生態(tài)治理示范技術(shù)”(TG1517) 江蘇省水利科技項(xiàng)目“徐州礦井水綜合生態(tài)治理技術(shù)及開發(fā)利用模式研究與應(yīng)用”(2014052)
【分類號(hào)】:P641.2
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