Stress Redistribution Monitoring Using Passive Seismic Tomography at a Deep Nickel Mine

Details

• Personal Author:
  Ma X ; Malek F ; Westman E ; Yao M
• Description:
  High magnitude seismic events (HMSE), also called major events, triggered at underground mines can severely threaten safety and structures in mines. The aims of this work are to assess stress evolution with the occurrence of them and identify patterns in stress change. Several methods were used to help understand the stress redistribution and rock mass behavior related to two HMSE with moment magnitude greater than 1.0 in a deep nickel mine. Approximately 46,500 seismic events were compiled with 2 HMSE at this mine and used seismic tomography to obtain high-resolution images and temporal-spatial velocity changes before and after these events. This work exhibited surrounding stress evolution and geological structures. Seismic imaging results show that velocity increased in the nearby regions of HMSE before they were triggered. Stress subsequently reduced in the relaxation process after the occurrence of HMSE. Conversely, regions predominantly occupied by low-velocity anomalies increased to higher stress levels after HMSE. Overall, the stress redistributed toward an equilibrium state following HMSE. This study highlights the value of utilizing seismic tomography for estimating stress evolution associated with HMSE. The findings illuminate the applications of seismic imaging around HMSE of hard-rock mines, providing insights into seismic hazard mitigation for deep mining. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Keywords:
  Author Keywords: High Magnitude Seismic Events Geotechnical Engineering Ground Stability HMSE Mining-induced Seismicity Mining Engineering Rock Mechanics Seismic Imaging Underground Mines
• ISSN:
  0723-2632
• Document Type:
  Text
• Funding:
  Contract
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  52
• Issue:
  10
• NIOSHTIC Number:
  nn:20068587
• Citation:
  Rock Mech Rock Eng 2019 Oct; 52(10):3909-3919
• Contact Point Address:
  Xu Ma, Department of Mining and Minerals Engineering, Virginia Tech, Blacksburg, VA, 24060, USA
• Email:
  xuma@vt.edu
• Federal Fiscal Year:
  2020
• Performing Organization:
  Virginia Polytechnic Institute & State University
• Peer Reviewed:
  True
• Start Date:
  20110816
• Source Full Name:
  Rock Mechanics and Rock Engineering
• End Date:
  20160815
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:d794badffee5ad536392e0cdd1da44217d14919bc7cef6b540d5b8e51990fb75e00b740b30d5f8b7956150b22201b431922d0952530df1d669f2c85119c92fc2
• Download URL:
  https://stacks.cdc.gov/view/cdc/207193/cdc_207193_DS1.pdf
• File Type:
  [PDF - 8.04 MB ]