Citation: | ZHAO Chunhong, LIANG Yongping, WANG Zhiheng, TANG Chunlei, SHEN Haoyong. 2023. Dynamic characteristics and evolution mechanism of "goaf water" of coal mine in Shandi River Basin, Yangquan, Shanxi Province and its environmental effects on Niangziguan Spring Area[J]. Geology in China, 50(5): 1471-1485. doi: 10.12029/gc20220327001 |
This paper is the result of hydrogeological survey engineering.
With the characteristics of wide distribution, concealment, heavy pollution, slow natural purification and long duration, the "goaf water" of coal mine has become an important restrictive factor that seriously threatens the construction of ecological civilization in China in the post coal mining era.
Taking the goaf water of coal mine in Shandi River Basin of Yangquan City, Shanxi Province as the research object, this paper systematically analyzes the dynamic characteristics and evolution mechanism of water quantity and quality of goaf water in Shandi River Basin by using a long series of systematic monitoring of water quality and quantity, and statistical methods.
The results indicate that the average pH of the total outlet of "goaf water" in Shandi River is 3.58, the average TDS is 4744 mg/L, and the average SO42- is 3327 mg/L. After the rise of groundwater level in rainy season, the increase of contact area or volume and the lag of rainfall are the main reasons for the nonlinear correlation between the flow of goaf water and the conductivity and SO42- concentration of hydrochemical characteristic indexes. The strong oxidation reaction of pyrite in coal measure strata mainly occurs in the seasonal variation zone of groundwater level, aeration zone and surface. The certain depth of the gob ponding area of the coal mine is the reduction environment, which has the conditions for microbial treatment. After the "goaf water" flows out, the leakage recharge in the downstream carbonate section is 7247.08 m3/d, and the water quality is poor, which is an important pollution source of karst groundwater in Niangziguan Spring area.
The regulation and storage period of "goaf water" flow to rainfall in Shandi river basin is half a year. The hydrochemical characteristic index is nonlinear related to the flow. The strong oxidation reaction of "goaf water" pyrite mainly occurs in the seasonal fluctuation zone of groundwater level, aeration zone and surface. After the "goaf water" flows out, the leakage recharge in the downstream carbonate section is 7247.08 m3/d, SO42-, Fe and Mn exceed the standard seriously, which is an important pollution source of karst groundwater in Niangziguan Spring area. It is urgent to carry out the treatment of "goaf water" in coal mines and the ecological restoration of abandoned coal mines.
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Distribution map of monitoring points in the Shandi River Basin and section diagram
Daily discharge and daily precipitation in the total outlet of Shandi River
Relationship between total outlet discharge and precipitation of Shandi River
Relationship between discharge and conductivity of each monitoring point
Relationship between SO42- and conductivity in the main monitoring points
Relationship between the concentration of SO42- and other components in the total outlet of Shandi River
Dynamic curve of SO42-, TDS and monthly precipitation in the monitoring points
Dynamic curve of TFe, Mn and monthly precipitation in the monitoring points
Relationship of S in SO42- and TFe in the total outlet of Shandi River
Relationship between temperature and dissolved oxygen of clean water and monitoring points