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Mechanical criteria and sensitivity analysis of water inrush through a mining fault above confined aquifers

  • Jian SunEmail author
  • Lianguo Wang
  • Yang Hu
Original Paper
  • 48 Downloads

Abstract

A mechanical model of water inrush through a mining fault in the workface above confined aquifers was developed according to ground pressure and strata control theory. Based on limit equilibrium theory of rock mass, mechanical criteria of the water inrush through the mining fault in the workface above confined aquifers were deduced by considering Mohr–Coulomb yield criterion. Five influencing factors, namely fault dip, fault cohesion, fault internal friction angle, suspended goaf range behind the workface, and thickness of floor strata protective zone, were selected from the mechanical criteria of an ultimate hydraulic pressure that the stope floor strata with a fault can tolerate. An orthogonal test was performed to analyze the sensitivity of the ultimate hydraulic pressure tolerated by the stope floor strata with fault. Results show that the fault dip and thickness of the floor strata protective zone significantly influence the ultimate hydraulic pressure tolerated by the stope floor strata with fault and represent 32.8% and 32.5% of the total effects, respectively. The fault cohesion, fault internal friction angle, and suspended goaf range behind the workface exert similar effects on the ultimate hydraulic pressure that the floor strata with a fault can tolerate and comprise 10.5%, 13.5%, and 10.7% of the total effects, respectively. The ultimate hydraulic pressure that the stope floor strata with a fault can tolerate decreases with the increase in the fault dip, fault internal friction angle, and suspended goaf range behind the workface but increases with the fault cohesion and thickness of the floor strata protective zone. This property decreases with the distance between the coal wall of the workface and the fault. This study provides insights into the water inrush mechanism through the mining fault in the workface and its corresponding sensitivity, thereby aiding in establishing the safe mining of coal seam with fault above confined aquifers.

Keywords

Water inrush through fault Ultimate hydraulic pressure Mechanical criteria Sensitivity 

Notes

Acknowledgments

This study was supported by the National Natural Science Foundation of China (No. 51404013, No. 51674008), the Open Projects of State Key Laboratory of Coal Resources and Safe Mining at China University of Mining and Technology (No. 19KF01), the Major Research Funding Project of Natural Science of Anhui Province University (No. KJ2018ZD010), and the Natural Science Foundation of Anhui Province (No. 1508085ME77, No. 1708085ME133).

References

  1. Bai HB, Miao XX (2009) Research progress and major problems of water preserved coal mining. J Min Saf Eng 26(3):253–262Google Scholar
  2. Du WS, Jiang YD, Ma ZQ, Jiao ZH (2017) Assessment of water inrush and factor sensitivity analysis in an amalgamated coal mine in China. Arab J Geosci 10(21):471CrossRefGoogle Scholar
  3. Gao R, Yan H, Ju F, Mei XC, Wang XL (2018) Influential factors and control of water inrush in a coal seam as the main aquifer. Int J Min Sci Technol 28(2):187–193CrossRefGoogle Scholar
  4. Guo BH, Cheng T, Wang L, Luo T, Yang XY (2018) Physical simulation of water inrush through the mine floor from a confined aquifer. Mine Water Environ 37(3):577–585.Google Scholar
  5. Han J, Shi LQ, Yu XG, Wei JC, Li SC (2009) Mechanism of mine water-inrush through a fault from the floor. Min Sci Technol 19(3):276–281Google Scholar
  6. Hu XY, Wang LG, Lu YL, Yu M (2014) Analysis of insidious fault activation and water inrush from the mining floor. Int J Min Sci Technol 24(4):477–483CrossRefGoogle Scholar
  7. Huang CH, Feng T, Wang WJ, Liu H (2010) Research on the failure mechanism of water-resisting floor affected by fault. J Min Saf Eng 27(2):219–222Google Scholar
  8. Li TL, Tan XS, Liu CW (1991) Rock mechanics for mine. Chongqing University Press, ChongqingGoogle Scholar
  9. Li LJ, Qian MG, Li SG (1996) Mechanism of water-inrush through faults. J China Coal Soc 21(2):119–123Google Scholar
  10. Li QF, Wang WJ, Zhu CQ, Peng WQ (2009) Analysis of fault water inrush mechanism based on the principle of water-resistant key strata. J Min Saf Eng 26(1):87–90Google Scholar
  11. Li LC, Yang TH, Liang ZZ, Zhu WC, Tang CA (2011) Numerical investigation of groundwater outbursts near faults in underground coal mines. Int J Coal Geol 85(3–4):276–288Google Scholar
  12. Li H, Bai HB, Wu JJ, Wang CS, Ma ZG, Du YB (2017) Mechanism of water inrush driven by grouting and control measures-a case study of Chensilou mine, China. Arab J Geosci 10(21):468CrossRefGoogle Scholar
  13. Liang DX, Jiang ZQ, Guan YZ (2015) Field research: measuring water pressure resistance in a fault-induced fracture zone. Mine Water Environ 34(3):320–328CrossRefGoogle Scholar
  14. Liu SL, Liu WT, Yin DW (2017) Numerical simulation of the lagging water inrush process from insidious fault in coal seam floor. Geotech Geol Eng 35(3):1013–1021CrossRefGoogle Scholar
  15. Lu YL, Wang LG (2015) Numerical simulation of mining-induced fracture evolution and water flow in coal seam floor above a confined aquifer. Comput Geotech 67: 157–171CrossRefGoogle Scholar
  16. Lu HF, Shen D, Yao DX, Hu YB (2014) Analytical solution of critical water inrush pressure of mining floor affected by fault. J Min Saf Eng 31(4):888–895Google Scholar
  17. Miao XX (2011) Water preserved coal mining method and application to arid and semi-arid mining areas. China University of Mining and Technology Press, XuzhouGoogle Scholar
  18. Miao XX, Liu WQ, Chen ZQ (2004) Seepage theory of mining rockmass. Science Press of China, BeijingGoogle Scholar
  19. Qian MG, Miao XX, Xu JL, Mao XB (2003a) Key strata theory in ground control. China University of Mining and Technology Press, XuzhouGoogle Scholar
  20. Qian MG, Shi PW, Xu JL (2003b) Ground pressure and strata control. China University of Mining and Technology Press, XuzhouGoogle Scholar
  21. Shi LQ, Singh RN (2001) Study of mine water inrush from floor strata through faults. Mine Water Environ 20(3):140–147CrossRefGoogle Scholar
  22. Song ZQ, Hao J, Tang JQ, Shi YK (2013) Study on water inrush from fault’s prevention and control theory. J China Coal Soc 38(9):1511–1515Google Scholar
  23. Sun J, Miao XX (2017) Water-isolating capacity of an inclined coal seam floor based on the theory of water-resistant key strata. Mine Water Environ 36(2):310–322Google Scholar
  24. Sun J, Wang LG, Hou HQ (2013) Resurch on water-isolating capacity of the compound water-resisting key strata in coal seam floor. J China Univ Min Technol 42(4):560–566Google Scholar
  25. Sun J, Hu Y, Zhao GM (2017) Relationship between water inrush from coal seam floors and main roof weighting. Int J Min Sci Technol 27(5):873–881CrossRefGoogle Scholar
  26. Wu Q, Zhou WF (2008) Prediction of groundwater inrush into coal mines from aquifers underlying the coal seams in China: vulnerability index method and its construction. Environ Geol 55(4):245–254CrossRefGoogle Scholar
  27. Wu Q, Wang MY, Wu X (2004) Investigations of groundwater bursting into coal mine seam floors from fault zones. Int J Rock Mech Min Sci 41(4):557–571CrossRefGoogle Scholar
  28. Yin SX, Hu WY (2008) Rocks’ water-resistance ability and natural progressive intrusion height. Coal Geol Explor 36(1):34–36Google Scholar
  29. Yin HY, Wei JC, Lefticariu L, Guo JB, Xie DL, Li ZL, Zhao P (2016) Numerical simulation of water flow from the coal seam floor in a deep longwall mine in China. Mine Water Environ 35(2):243–252Google Scholar
  30. Zhang JC (2005) Investigations of water inrushes from aquifers under coal seams. Int J Rock Mech Min Sci 42(3):350–360CrossRefGoogle Scholar
  31. Zhang R, Jiang ZQ, Zhou HY, Yang CW, Xiao SJ (2014) Groundwater outbursts from faults above a confined aquifer in the coal mining. Nat Hazards 71(3):1861–1872CrossRefGoogle Scholar
  32. Zhang SC, Guo WJ, Li YY, Sun WB, Yin DW (2017) Experimental simulation of fault water inrush channel evolution in a coal mine floor. Mine Water Environ 36(3):443–451CrossRefGoogle Scholar
  33. Zhou QL, Herrera J, Hidalgo A (2017) The numerical analysis of fault-induced mine water inrush using the extended finite element method and fracture mechanics. Mine Water Environ 36(4):1–11Google Scholar
  34. Zhu WC, Wei CH (2011) Numerical simulation on mining-induced water inrushes related to geologic structures using a damage-based hydromechanical model. Environ Earth Sci 62(1):43–54Google Scholar

Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  1. 1.School of Energy and SafetyAnhui University of Science and TechnologyHuainanChina
  2. 2.State Key Laboratory of Coal Resources and Safe MiningChina University of Mining and TechnologyXuzhouChina

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