Simulation of groundwater level recovery in abandoned mines, Fengfeng coalfield, China

MA Luan; WANG Guang-cai; SHI Zhe-ming; GUO Yu-ying; XU Qing-yu; HUANG Xu-juan

Volume 4 Issue 4

Dec. 2016

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Article Navigation > Journal of Groundwater Science and Engineering > 2016 > 4(4): 344-353

MA Luan, WANG Guang-cai, SHI Zhe-ming, et al. 2016: Simulation of groundwater level recovery in abandoned mines, Fengfeng coalfield, China. Journal of Groundwater Science and Engineering, 4(4): 344-353.

Citation:

MA Luan, WANG Guang-cai, SHI Zhe-ming, et al. 2016: Simulation of groundwater level recovery in abandoned mines, Fengfeng coalfield, China. Journal of Groundwater Science and Engineering, 4(4): 344-353.

Citation:

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Simulation of groundwater level recovery in abandoned mines, Fengfeng coalfield, China

1School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China. 2State Key Laboratory of Biogeology and Environmental Geology & MOE Key Laboratory of Groundwater Circulation and Evolution, China University of Geosciences, Beijing 100083, China.

Publish Date: 2016-12-28

Abstract

Abstract

Abandoned mines are of high potential risk as they could be a large underground storage of pollutants (heavy metals and organic wastes, etc.). Various physical, chemical and biological reactions would take place when groundwater flows into underground spaces, which makes abandoned mine a huge potential hazard to groundwater environment. The recovery of groundwater level is one of the key elements controlling the reactions and causing such hazards. This paper simulated groundwater level recovery processes in the abandoned mines, Fengfeng coalfield by using the computer program FEFLOW. The paper integrated the pipe flow model, “three zones” model and groundwater inrush (discharge) model in the simulation of groundwater in the complex laneway-aquifer system. Groundwater flow in the laneway systems was considered pipe flow and described in Bernoulli equation. The water-bearing medium (coal seam roof) overlying the laneway systems was divided into “three zones” composed of the caving zone, fissure zone and bending zone based on the disruption degrees of previous mining. Groundwater in the Ordovician limestone aquifer (bottom of coal seam) flowing into laneway systems was considered a major inrush/recharge source, and its flow rate was calculated by an inrush (discharge) model which was newly developed in this study and incorporated into FEFLOW. The results showed that it would take approximately 95 days for groundwater in abandoned mines to recover to regional groundwater level elevation, and the total amount of water filling up would be about 1.41195×107 m3, which is consistent with the actual data. The study could be of theoretical and practical significance to mitigate abandoned mines’ hazards and improve mine groundwater utilization.
- Abandoned mine,
- Laneway system,
- Aquifer media,
- FEFLOW program,
- Groundwater level recovery

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References(27)

References

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