Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-118
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
05 May 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Mechanism of groundwater inrush hazard caused by solution mining in multilayer rock salt mine area: a case study in Tongbai County, China
Bin Zeng1, Tingting Shi2, Zhihua Chen1, Liu Xiang3, Shaopeng Xiang4, and Muyi Yang1 1School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, P. R. China
2Three Gorges Research Center for Geo-Hazard, Ministry of Education, Wuhan 430074, Hubei, P. R. China
3Department of Geological Engineering, Hubei Land Resources Vocational College, Wuhan 430074, P. R. China
4Hydrological Engineering Environment Technology Consulting Co. Ltd., Wuhan 430074, P. R. China
Abstract. The solution mining of salt mineral resources may contaminate groundwater and lead to water inrush out of the ground due to brine leakage. Taking a serious groundwater inrush hazard in a large salt mining area with three different types of ore beds which are trona (trisodium hydrogendicarbonate dihydrate, also sodium sesquicarbonate dihydrate, Na2CO3 · NaHCO3 · 2H2O, is a non-marine evaporite mineral), glauber (sodium sulfate, is the inorganic compound with formula Na2SO4 as well as several related hydrates) and gypsum (a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4 · 2H2O) in Tongbai County of China as an example, this paper mainly aims to analyse the source and channel of the inrush water. Based on the understanding of geological and hydrogeological conditions, the study obtained hydrochemical data of groundwater at different points and depths first; and then analysed the pollution source and pollutant component from single or mixed brines by both physical-chemical reaction principle analysis and hydrogeochemistry simulation method; finally possible leakage brine conducting channel to the ground had been discussed from both geological and artificial aspects. The results reveal that the brine from the trona mine is the major pollution source; the fissure zone in NW–SE direction controlled by the geological structure provides the main channels for the leakage brine to flow into the aquifer around the water inrush regions, and a large number of waste gypsum exploration boreholes are the channels that supply the polluted groundwater inrush out of the ground. The research can offer a valuable reference for avoiding and assessing groundwater inrush hazard in similar rock salt mining area, which is advantageous for both groundwater quality protection and resident health.

Citation: Zeng, B., Shi, T., Chen, Z., Xiang, L., Xiang, S., and Yang, M.: Mechanism of groundwater inrush hazard caused by solution mining in multilayer rock salt mine area: a case study in Tongbai County, China, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-118, in review, 2017.
Bin Zeng et al.
Bin Zeng et al.
Bin Zeng et al.

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Short summary
Solution mining of salt mineral resource may contaminate groundwater and lead to groundwater inrush hazard. Geological condition is the basis which determines the total risk, Physical-chemical reaction principle analysis and hydrogeochemical simulation can not only determine the source of leakage brine but also identify the mixed proportion of inrush water in a multilayer rock salt mine area. The research can offer a valuable reference for both groundwater quality protection and resident health.
Solution mining of salt mineral resource may contaminate groundwater and lead to groundwater...
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