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Stability Analysis of Drives Excavated in Paste-Filled Stopes for Underhand Mining



Details

  • Personal Author:
  • Description:
    This paper evaluates the stability of drives excavated in paste-filled stopes that have been previously mined out. Stability of the drives is important as the vibrations generated during the drilling and blasting processes affect the stability of the drives in low-strength paste. The practical implementation of the process has been carried out at an underground lead-zinc mine in India. A similar detailed study for such a mining practice in India has not been conducted in the past. Simulation for effect of blasting vibrations and subsequent excavations of the drives on the paste-filled stope is carried out through dynamic numerical analysis in FLAC3D. Rayleigh damping conditions were applied to the model along with the application of dynamic loading conditions. Dynamic response of the blasting and excavation process is studied to evaluate displacement magnitudes and strength-to-stress ratio for the excavated drives. The numerical model is calibrated using the peak particle velocity data of blast vibrations obtained from the field test. The numerical results are in accord with the field observations in the mine. Limited damage to the drives is observed and the dynamic model confirms the same due to the effect of blast loads. Future scope of the study is to understand the stability of drives with changes in stress conditions as the mining advances to greater depths. It may also help to modify the blasting parameters to control the vibrations affecting the drives in paste-fill. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • Publisher:
    American Rock Mechanics Association (ARMA)
  • Document Type:
    Text
  • Funding:
    Contract
  • Genre:
    Proceedings
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • NIOSHTIC Number:
    nn:20068391
  • Citation:
    53rd US Rock Mechanics/Geomechanics Symposium, June 23-26, 2019, New York. Alexandria, VA: American Rock Mechanics Association (ARMA), 2019 Jun; :ARMA 19-2063
  • Federal Fiscal Year:
    2019
  • Performing Organization:
    Virginia Polytechnic Institute
  • Peer Reviewed:
    False
  • Start Date:
    20160901
  • Source Full Name:
    53rd US Rock Mechanics/Geomechanics Symposium, June 23-26, 2019, New York
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:158604fcd9e073c5f278ea6bbd973d6514bac1c2d2054cc855e5f6eb750e72a4a6f1813ced4a7ca1797b2e37b1e77f93eec5d7c34328717975dc8be2d457db05
  • Download URL:
  • File Type:
    Filetype[PDF - 1.06 MB ]
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