Abstract
Due to coal mining taking place on a large scale in northern China, it is inevitable that wide-spread dewatering occurs in the aquifers overlying the resulting goaf. The purpose of this paper is to protect the groundwater of overlying unconsolidated aquifers. Based on physical model experiment, seepage experiments, and numerical simulation, this paper determines the patterns and distribution of the overburden rocks in the goaf, establishes the correlation between the fracture ratio and the hydraulic conductivity of the rock mass, and characterizes the groundwater flow pattern. The results show that (1) the residual fracture occurring ratio within the residual fracture zone is approximately 1.82 times that of the fracture compaction zone and 1.93 times that of the coal wall support zone; (2) the hydraulic conductivity of the rock mass in different parts of the goaf increases with increasing fracture ratio, the relationship of the two follows a power curve; (3) the predicted groundwater levels from numerical simulation is good fit with the measured and indicates that the hydraulic conductivities derived from seepage experiments are rational. We demonstrate how a laboratory-scale physical model can be used effectively to verify existing conceptual models in such a way that the impact of coal mining on groundwater resources can be predicted for similar regions.
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References
Adhikary DP, Guo H (2015) Modelling of longwall mining-induced strata permeability change. Rock Mech Rock Eng 48:345–359. https://doi.org/10.1007/s00603-014-0551-7
Atanacković N, Dragišić V, Živanović V, Gardijan S, Magazinović S (2016) Regional-scale screening of groundwater pollution risk induced by historical mining activities in Serbia. Environ Earth Sci 75:1152. https://doi.org/10.1007/s12665-016-5983-9
Bai M, Elsworth D (1994) Modeling of subsidence and stress-dependent hydraulic conductivity for intact and fractured porous media. Rock Mech Rock Eng 27:209–234. https://doi.org/10.1007/BF01020200
Berg SJ, Hsieh PA, Illman WA (2011) Estimating hydraulic parameters when poroelastic effects are significant. Ground Water 49:815–829. https://doi.org/10.1111/j.1745-6584.2010.00781.x
Booth CJ, Greer CB (2010) Modeling the hydrologic effects of longwall mining on the shallow aquifer system using MODFLOW with telescopic mesh refinement. Final Project Report http://www.techtransfer.osmre.gov/NTTMain- ite/appliedscience/2007/Projects/NIUBooth2007. Accessed 16 Nov 2017
Booth CJ, Greer CB (2011) Application of MODFLOW using TMR and discrete-step modification of hydraulic properties to simulate the hydrogeologic impact of longwall mining subsidence on overlying shallow aquifers. Mine Water – Managing the Challenges: 11th IMWA Congress, International Mine Water Association, Aachen, Germany http://www.mwen.info/docs/imwa_2011/IMWA2011_Booth_306.pdf. Accessed 28 Nov 2017
Bukowski P (2015) Evaluation of water hazard in hard coal mines in changing conditions of functioning of mining industry in Upper Silesian Coal Basin – USCB (Poland). Arch Min Sci 60:455–475. https://doi.org/10.1515/amsc-2015-0030
Cervik J (1979) Methane control on longwalls—European and U.S. practices. Longwall–Shortwall Mining, Art. Society of Mining Engineers of American Institute of Mining, Metallurgical, and Petroleum Engineers, New York, pp 75–80
David K, Timms WA, Barbour SL, Mitra R (2017) Tracking changes in the specific storage of overburden rock during longwall coal mining. J Hydrol 553:304–320. https://doi.org/10.1016/j.jhydrol.2017.07.057
Elsworth D (1989) Thermal permeability enhancement of blocky rocks: one dimensional flows. Int J Rock Mech Min Sci Geomech Abstr 26:329–339. https://doi.org/10.1016/0148-9062(89)91981-5
Hawkins JW, Dunn M (2007) Hydrologic characteristics of a 35-year-old underground mine pool. Mine Water Environ 26:150–159. https://doi.org/10.1007/s10230-007-0003-7
Hill JG, Price DR (1983) The impact of deep mining on an overlying aquifer in western Pennsylvania. Ground Water Monit R 3:138–143. https://doi.org/10.1111/j.1745-6592.1983.tb00875.x
Howladar MF (2013) Coal mining impacts on water environs around the Barapukuria coal mining area, Dinajpur, Bangladesh. Environ Earth Sci 70:215–226. https://doi.org/10.1007/s12665-012-2117-x
Karacan CO (2010) Prediction of porosity and permeability of caved zone in longwall gobs. Transp Porous Media 82:413–439. https://doi.org/10.1007/s11242-009-9437-7
Karacan CO, Goodman G (2009) Hydraulic conductivity changes and influencing factors in longwall overburden determined by slug tests in gob gas ventholes. Int J Rock Mech Min Sci 46:1162–1174. https://doi.org/10.1016/j.ijrmms.2009.02.005
Karmis M, Agioutantis Z, Jarosz A (1990) Recent developments in the application of the influence function method for ground movement predictions in the US. Min Sci Technol 10:233–245. https://doi.org/10.1016/0167-9031(90)90439-Y
Liu J, Elsworth D (1998) Three-dimensional effects of hydraulic conductivity enhancement and desaturation around mined panels. Int J Rock Mech Min Sci 34:1139–1152. https://doi.org/10.1016/S1365-1609(97)80067-6
Oda MT, Takemura A, Aoki T (2002) Damage growth and permeability change in triaxial compression tests of Inada granite. Mech Mater 34:313–331. https://doi.org/10.1016/S0167-6636(02)00115-1
Palchik V (2010) Experimental investigation of apertures of mining-induced horizontal fractures. Int J Rock Mech Min Sci 47:502–508. https://doi.org/10.1016/j.ijrmms.2009.09.007
Rezakhani P, Jang WS, Lee S, Lee DE (2014) Project risk assessment model combining the fuzzy weighted average principle with a similarity measure. KSCE J Civ Eng 18:521–530. https://doi.org/10.1007/s12205-014-0053-x
Schmiedel T, Kjoberg S, Planke S, Magee C, Galland O, Schofield N, Jackson CA-L, Jerram DA (2017) Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin. In: Interpretation-a journal of subsurface characterization 5: SK23-SK38, vol 5, pp SK23–SK38. https://doi.org/10.1190/INT-2016-0155.1
Shao H, Jiang SG, Wang LY (2011) Bulking factor of the strata overlying the gob and a three-dimensional numerical simulation of the air leakage flow field. Min Sci Technol 21:261–266. https://doi.org/10.1016/j.mstc.2011.02.001
Singh MM, Kendorski FS (1983) Strata disturbance prediction for mining beneath surface water and waste impoundments. In: Proceedings of 1st conference on ground control in mining. 20:A13. https://doi.org/10.1016/0148-9062(83)91724-2
Tammetta P (2013) Estimation of the height of complete groundwater drainage above mined longwall panels. Groundwater 51:723–734. https://doi.org/10.1111/gwat.12003
Tammetta P (2015) Estimation of the change in hydraulic conductivity above mined longwall panels. Groundwater 53:122–129. https://doi.org/10.1111/gwat.121513
Wang H, Qiao W, Chai R (2015) Overburden rock hydraulic conductivity variation and vertical zoning characteristics under the influence of coal mining. Coal Geology & Exploration 43:51–55. https://doi.org/10.3969/j.issn.1001-1986.2015.03.010 (in Chinese)
Whittaker BN, Reddish DJ, Fitzpatrick DJ (1985) Ground fractures due to longwall mining subsidence. International mine water association; international mine water association. Granada, pp 1057–1072
Zhang J (2005) Investigations of water inrushes from aquifers under coal seams. Int J Rock Mech Min Sci 42:350–360. https://doi.org/10.1016/j.ijrmms.2004.11.010
Zhang YB, Li Y (2015) Experimental study on distribution law of residual fissure under multiple mining conditions. Revista de la construcción 14:77–81. https://doi.org/10.4067/S0718-915X2015000100010
Zipper C, Balfour W, Roth R, Randolph J (1997) Domestic water supply impacts by underground coal mining in Virginia, USA. Environ Geol 29:84–93. https://doi.org/10.1007/s002540050107
Acknowledgments
The idea for the paper was developed by all authors of this manuscript who set up a working group and worked jointly on the manuscript. The work was coordinated by the corresponding author Yongxin Xu. Kai Wang, Pei Chen, Xue Wang, Qiang Zheng, and Zhixiang Zhang performed the experiments. The text was mainly written by Yongbo Zhang and Yongxin Xu.
Funding
The National Natural Science Foundation of China (NSFC) (No.41572221) for funded this project.
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Zhang, Y., Xu, Y., Wang, K. et al. The fracturing characteristics of rock mass of coal mining and its effect on overlying unconsolidated aquifer in Shanxi, China. Arab J Geosci 11, 666 (2018). https://doi.org/10.1007/s12517-018-4034-0
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DOI: https://doi.org/10.1007/s12517-018-4034-0