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Investigations of the height of fractured zones in overburden induced by undersea mining

  • Ying Chen
  • Guoyan Zhao
  • Shaofeng WangEmail author
  • Xiang Li
Original Paper
  • 8 Downloads

Abstract

Water inrush accidents are devastating to underground mining operations and cause damage. In particular, in undersea mining, mining safety is endangered as the mining-induced fractured zone extends upwards towards the vast amount of seawater. This paper describes a case study of the development of a fractured zone induced by undersea mining of a tilted ore body in the Xinli district of the Sanshandao Gold Mine in Shandong Province, China. A theoretical prediction model based on overburden movement during mining is proposed to analyse the developed height of the fractured zone induced by undersea mining of the tilted ore body. The Universal Discrete Element Code (UDEC) software program is adopted to establish a numerical model to investigate the movement and fracturing of the overlying strata during mining of the gold deposit from the – 280-m level to the – 200-m level in the Xinli district. For the study area in the – 200-m level, in which the gold deposit is currently being mined and is the closest to the seafloor, the theoretical (32.7 m) and numerical (36.23 m) results for the height of the fractured zone are in agreement with the field observations (32.1 m) from a panoramic borehole televiewer. These results indicate that the fractured zone in the Xinli mining area has not reached the seafloor and that the mine remains safe.

Keywords

Undersea mining Strata movement Fractured zone Developed height Overburden stability 

Notes

Acknowledgements

The authors would like to thank the Sanshandao Gold Mine workers, who provided considerable support in terms of both field detection and data collection.

Funding information

This project was sponsored by the National Natural Science Foundation of China (No. 151374244).

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Ying Chen
    • 1
  • Guoyan Zhao
    • 1
  • Shaofeng Wang
    • 1
    Email author
  • Xiang Li
    • 1
  1. 1.School of Resources and Safety EngineeringCentral South UniversityChangshaPeople’s Republic of China

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