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Spatial and Temporal Distribution of Groundwater in Open-Pit Coal Mining: A Case Study from Baorixile Coal Mine, Hailaer Basin, China

Authors :
Wenfeng Du
Lei Chen
Yunlan He
Qiangmin Wang
Peiqiang Gao
Quansheng Li
Source :
Geofluids, Vol 2022 (2022)
Publication Year :
2022
Publisher :
Hindawi-Wiley, 2022.

Abstract

Groundwater distribution influenced by mining activities is hard to be tracked due to the lack of accurate and real-time monitoring data. To address the groundwater dynamic change data under the mining conditions of open-pit coal mines, a three-dimensional automatic observation network of groundwater was constructed, and this observation network takes open-pit as the center, showing a radioactive distribution, based on hydrogeological conditions, and observes different aquifers. The data was analyzed by integrating hydrology, mining activity, and meteorological data. Analytic hierarchy process was adopted to reveal the underground disturbance influencing factors, and suggestions for groundwater protection were given. The results show that the dynamic variations of the groundwater with time can be divided into 3 types (precipitation affected, unaffected type, and mining affected types). The drainage operation during the open-pit mining triggered the drop of groundwater level, resulting in a cone of depression. The maximum drawdown of the central groundwater level was 60 m. And the disturbance mainly occurred in the mining area where the maximum groundwater disturbance radius was 8 km. Artificial drainage was the main disturbance factor of groundwater, and the range of groundwater level drop within the disturbance radius was closely related to the distance from the open-pit coal mine and the drainage volume. The closer the distance to the mines and the higher the drainage volume led to the deeper the groundwater level drop. This study shows the importance of the three-dimensional observation network of groundwater and provides a good reference for groundwater resources protection and ecological restoration in open-pit coal mines.

Subjects

Subjects :
Geology
QE1-996.5

Details

Language :
English
ISSN :
14688123
Volume :
2022
Database :
Directory of Open Access Journals
Journal :
Geofluids
Publication Type :
Academic Journal
Accession number :
edsdoj.8222a0ad0b97408b9a2215593d459a6f
Document Type :
article
Full Text :
https://doi.org/10.1155/2022/8753217