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Height of water-conducting fractured zone in coal mining in the soil–rock composite structure overburdens

  • Yu Liu
  • Qi-meng LiuEmail author
  • Wen-ping Li
  • Tao Li
  • Jiang-hui He
Original Article
  • 127 Downloads

Abstract

Large-scale mining of coal seams gives rise to the leakage of phreatic water and further deteriorates the ecological environment of arid and semiarid mining areas in Northern Shaanxi Province. The height of the water-conducting fractured zone (WCFZ) in coal mining is the key to evaluating the presence of phreatic water leakage. This paper adopts the running water quantity of boreholes monitoring and distributed optical fiber sensing (DOFS) technology to conduct in situ measurements of the WCFZ height in soil–rock composite structure overburdens. Twenty groups of data were used to analyze the factors which influence the development height of the WCFZ and several equations are proposed to estimate the WCFZ characteristics. As indicated by the study results, the DOFS technology effectively ascertains the height of water-conducting fractures in soil and the soil layer had an obvious inhibitory effect on the height of WCFZ, with an inhibiting factor of about 0.5. The maximum relative error between predicted values and measured values was 5.34% and the relative error between predicted values and numerical simulation results was within 1.5%, verifying the accuracy of the prediction equations. The study results will help avoid water inrush hazards in mining areas and protect mining areas against ecological damages.

Keywords

WCFZ Soil-rock overburden DOFS In-site investigation Empirical equation 

Notes

Acknowledgements

We gratefully acknowledge the support provided by the National Natural Science Foundation of China under Grant no. 41472235 and the National Key Research and Development Program of China under Grant no. 2017YFC0804101 and the Open Foundation of State Key Laboratory for Geomechanics and Deep Underground Engineering, CUMT under Grant no. SKLGDUEK1313. The authors are grateful to Prof. Shi B. and Dr. Wei G. Q. for their assistances.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yu Liu
    • 1
  • Qi-meng Liu
    • 2
    • 3
    Email author
  • Wen-ping Li
    • 4
  • Tao Li
    • 5
  • Jiang-hui He
    • 4
  1. 1.State Key Laboratory of Mining-induced Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainanChina
  2. 2.School of Earth and EnvironmentAnhui University of Science and TechnologyHuainanChina
  3. 3.State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhouChina
  4. 4.School of Resources and GeosciencesChina University of Mining and TechnologyXuzhouChina
  5. 5.School of Mining and Civil EngineeringLiupanshui Normal UniversityLiupanshuiChina

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