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Ground Subsidence and Surface Cracks Evolution from Shallow-Buried Close-Distance Multi-seam Mining: A Case Study in Bulianta Coal Mine

  • Xuelin Yang
  • Guangcai WenEmail author
  • Linchao Dai
  • Haitao Sun
  • Xuelong LiEmail author
Original Paper
  • 98 Downloads

Abstract

To explore the law of ground deformation from shallow-buried close-distance multi-seam mining, an observation station was built in the Bulianta Coal Mine to measure and record the periodic variation of related parameters about ground subsidence and surface cracks with the advancement of working face. From the data observed from the field, it can be found that, when lower seam mining, the ground subsidence above the previously mined area was deeper and steeper than that above the left pillar; besides, the influence scope of the former was larger than that of the latter. In terms of ground cracks, the ground cracks were formed ahead of the working face and developed rapidly during the period of the breakage of the immediate roof. Besides, the average interval of the ground cracks above the previous gob was 14.75 m, and still existed and hardly changed after the advancement of the working face; while that above the left pillar was 27.8 m and most of them were closed. In addition, when the advance rate of the working face was 12.8 m/day, the advance influence distance of the mining surface crack reached the minimum of 13.6 m. This finding is helpful for protecting the surficial environment in mining area during and after mining operations and is also of significance to conduct green mining in other mining areas.

Keywords

Ground deformation Vertical subsidence Surface cracks Ground subsidence 

Abbreviations

ϕ

Advance angle of influence

H0

Average mining height

Li

Advance influence distance

θ

Lagging angle of maximum subsidence velocity

l

Lagging distance of maximum subsidence velocity

Wcm

Maximum of ground subsidence

q

Subsidence coefficient

M

Mining height

α

Dip angle of coal seam

Notes

Acknowledgements

This study was financially supported by project (51574280, 51774319, 51874348)—National Natural Science Foundation of China, project (cstc2015jcyjBX0076)—Basic Science and Frontier Technology Research Project of Chongqing, project (2016ZX05045004)—National Science and Technology Major Project of China. The authors thank Mr. Wang Chen who has conducted a lot of field work, and the authors also thank the editor and anonymous reviewers very much for their valuable advices.

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Copyright information

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

Authors and Affiliations

  1. 1.State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resources and Environmental ScienceChongqing UniversityChongqingChina
  2. 2.Chongqing Research Institute of China Coal Technology and Engineering Group CropChongqingChina
  3. 3.National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency ControllingChongqingChina

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