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Physical simulation research on evolution laws of clay aquifuge stability during slice mining

  • Shizhong Zhang
  • Gangwei Fan
  • Dongsheng Zhang
  • Qizhen Li
Original Article

Abstract

The aquifuge stability is the key to study the impacts of coal mining on the aquifer. Based on the geological conditions of a mine in Yili of Xinjiang, China, this paper has studied the stability evolution laws of clay aquifuge during extremely thick coal seam mining by similar material simulation experiment in the laboratory. For the water-swelling and expansion property of clay aquifuge, the reasonable proportion of the similar material is firstly determined by taking the uniaxial compressive strength and the permeability coefficient as core indexes. Then, the overlying strata movement coupled solid–liquid physical model is established. In addition, the aquifuge deformation, the water level changes of the aquifer, and the height of fracture zone in overburden are analyzed during the slice mining. The research results indicate that the clay aquifuge will gradually occur instability failure during the mining of the working face, and the aquifuge stability has the threshold effects. When the ratio of the vertical displacement of the aquifuge to the thickness is Dv/T ≤ 58.0%, the ratio of the horizontal displacement to the thickness is Dh/T ≤ 17.0%, and the height of fractured zone in overburden is below the aquifuge, the mining-induced fractures may be closed and the aquifuge stability could be maintained. If Dv/T ≥ 75.0%, Dh/T ≥ 23.9%, and the height of fractured zone in overburden is within the aquifuge, the fractures will develop and connect the aquifuge and the stability failure of the aquifuge will occur, which has a direct correlation with the mining height.

Keywords

Similar material Solid-liquid coupling Slice mining Aquifuge Overlying strata movement 

Notes

Acknowledgements

Funding was provided by the Fundamental Research Funds for the Central Universities of China (Grant No. 2017XKQY073).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Shizhong Zhang
    • 1
  • Gangwei Fan
    • 1
  • Dongsheng Zhang
    • 1
  • Qizhen Li
    • 1
  1. 1.China University of Mining and TechnologyXuzhouChina

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