Effects of coal mining on the evolution of groundwater hydrogeochemistry

Qiao, Wei; Li, Wenping; Zhang, Shengcai; Niu, Yunfei

doi:10.1007/s10040-019-01969-2

Cited by 40 publications

(19 citation statements)

References 32 publications

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“…Among them, China’s coal consumption has increased from 30% in 2000 to 51% in 2017, and coal consumption accounted for 57.7% of the total energy consumption in 2019. Therefore, the safe and efficient mining of coal is of great importance to the national economy and people’s livelihood. − The potential groundwater influx at the working face or tunneling face during deep coal seam mining poses a serious threat to miners and their operations. , Generally, coal mines are prone to encounter aquifers above coal seams during mining, which are the main source of water inrush that can enter through mining cracks, faults, or pores . This aquifer is one of the main threats to the safety of coal mining; therefore, it is worth studying the overlying aquifer during mining.…”

Section: Introductionmentioning

confidence: 99%

Origin and Geochemical Characterization of Groundwater from Coal Seam: A Case Study of Balasu Coalfield, Ordos Basin

Chen,

Fang,

Wang

et al. 2024

ACS Omega

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The hydrochemical characteristics of groundwater are of great significance for studying the source, development, and utilization of groundwater. This study investigated the characteristics of anions and cations, total dissolved solids (TDS), hydrochemical types, and hydrogen and oxygen isotopes of surface water and groundwater in the Balasu coalfield. By conducting experiments using inductively coupled plasma emission electron spectrometry, ion chromatography, acid–base titration, and gravimetric analysis, the characteristics of ion concentration and TDS in different aquifers were analyzed to determine the possible source of groundwater in C2 (number 2 coal seam in Yan’an Formation). The Piper trilinear diagram was used to determine the hydrochemical types of aquifers, and the source of groundwater was determined based on the stable isotope characteristics of hydrogen and oxygen. The changes in ion, TDS, hydrogen, and oxygen isotopes of surface water and groundwater were analyzed, and the groundwater differences between the two sets of coal seams were compared. The research results indicate that the groundwater in C2 (number 2 coal seam in Yan’an Formation) is caused by the original sedimentary water and the infiltration of Zhiluo Formation and A1 (strata at the top of the Yan’an Formation to number 2 coal seam). However, C4 (number 3 coal seam in Yan’an Formation) is hindered by the well-developed mudstone in A3 (bottom of number 2 coal seam to the top of number 3 coal seam), which hinders the infiltration of groundwater. The study emphasizes that the overlying strata can have a significant impact on the coal seam when the moisture content is high and there is a lack of overlap, thereby promoting changes in the moisture content of the coal seam. This study provides some insights into the safety of coal mines, especially in mining areas with a high coal seam moisture content.

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Section: Introductionmentioning

confidence: 99%

Origin and Geochemical Characterization of Groundwater from Coal Seam: A Case Study of Balasu Coalfield, Ordos Basin

Chen,

Fang,

Wang

et al. 2024

ACS Omega

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“…Despite the continuous increase in the production and use of new energy, coal still plays a key role in the global fossil fuel supply system (Chen et al, 2014; Bi et al, 2021; Ju et al, 2020; Dong et al, 2020). It is the major energy source for electricity, residential heating, and industrial production in most countries (Qiao et al, 2019; Yin et al, 2019b). However, with the large-scale development of coal resources in China (Song et al, 2021; Yin et al, 2019a), especially with the increase and expansion of mining depth (Ruan et al, 2019), coal mining is bound to damage the surrounding rock structure of the aquifers (Shi et al, 2019a; Fan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

Wang¹,

Wang³

et al. 2022

Energy Exploration & Exploitation

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Coal mining at deep levels can cause mine water inrush and groundwater contamination, making it important to accurately and rapidly identify the water inrush source. In this study, 52 water samples were extracted from three types of aquifers in the Linhuan mining area, China. The water sample components Na+ + K+, Ca2+, Mg2+, HCO3−, Cl−, and SO42−, measured in the experiment, were used as evaluation variables, and the piecewise function equation was established by using the exponential whitening function. Finally, combined with water sample data and the CRITIC weighted grey situation decision-making method, the comprehensive membership degree was obtained, and the water inrush source was identified according to the principle of the maximum membership degree. The comprehensive accuracy of the model was 92.3%. The traditional grey situation decision-making method uses the linear whitening function to determine the membership value, ignoring that the value of the whitening function outside the adjacent level is 0, which improves the weight of the adjacent level, causes the loss of effective information, and reduces the discrimination rate. The exponential whitenization function in this paper will solve this problem and further improves the grey situation decision-making method to discriminate the water inrush source, which would also be beneficial regarding the prevention and control of mine water inrush and groundwater contamination.

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“…These overburden deformations also modify the hydrogeological setting of mined areas. Induced fractures, for instance, alter the flow paths of percolating groundwater while increasing the hydraulic conductivity of the rocks (Qu et al 2015;Zhang et al 2018b;Liu et al 2019;Qiao et al 2019). In addition, subsidence related to the deformation zone may change surface hydrological networks, increasing or decreasing the water balance of the mined area and changing the water level in the aquifers (Kelleher et al 1991;Blodgett and Kuipers 2002).…”

Section: Introductionmentioning

confidence: 99%

A dual-continuum model (TOUGH2) for characterizing flow and discharge in a mechanically disrupted sandstone overburden

et al. 2022

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Underground hard coal mining usually disrupts the mechanical equilibrium of rock sequences, creating fractures within minor permeable rocks. The present study employs a dual-continuum model to assess how both fractured and porous sandstone media influence the percolation process in postmining setups. To test the approach, the software TOUGH2 was employed to simulate laminar fluid flow in the unsaturated zone of the Ibbenbüren Westfield mining area. Compared to other coal mining districts in Germany, this area is delineated by the topography and local geology, leading to a well-defined hydrogeological framework. Results reveal good agreement between the calculated and measured mine water discharge for the years 2008 and 2017. The constructed model was capable of reproducing the bimodal flow behavior of the adit by coupling a permeable fractured continuum with a low-conductivity rock matrix. While flow from the fractured continuum results in intense discharge events during winter months, the rock matrix determines a smooth discharge limb in summer. The study also evaluates the influence of individual and combined model parameters affecting the simulated curve. A detailed sensitivity analysis displayed the absolute and relative permeability function parameters of both continua among the most susceptible variables. However, a strong a priori knowledge of the value ranges for the matrix continuum helps to reduce the model ambiguity. This allowed for calibration of some of the fractured medium parameters for which sparse or variable data were available. However, the inclusion of the transport component and acquisition of more site-specific data is recommended to reduce their uncertainty.

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Effects of coal mining on the evolution of groundwater hydrogeochemistry

Cited by 40 publications

References 32 publications

Origin and Geochemical Characterization of Groundwater from Coal Seam: A Case Study of Balasu Coalfield, Ordos Basin

Origin and Geochemical Characterization of Groundwater from Coal Seam: A Case Study of Balasu Coalfield, Ordos Basin

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

A dual-continuum model (TOUGH2) for characterizing flow and discharge in a mechanically disrupted sandstone overburden

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