A Hybrid Statistical-Analytical Technique for the Study of Rock Bursts in Sedimentary Rock Formations

Details

• Personal Author:
  Lawson H ; Maleki, Hamid N.
• Description:
  In an attempt to develop tools for assessing stress bump potential, the authors initiated a comprehensive study using site specific information from 25 case studies undertaken within the last four decades in U.S. mines. Data was painstakingly collected, integrated and analyzed initially in 1997 and reexamined, expanded and verified more recently. With the support of mining companies and NIOSH, the study was expanded recently adding two new case studies in burst-prone mines with geotechnical monitoring for verification of hybrid statistical-analytical models and for inclusion of additional variables. Multiple variable regression and numerical modeling analyses of geological and mining conditions were used to identify the most significant factors contributing to stress bumps in coal mines. Twenty-five factors were considered initially using site specific geologic and geometries in 27 case studies having experienced both violent and nonviolent failures. This work identified the most important variables contributing to violent failure of near seam strata. These are (1) mechanical properties of strata, (2) gate pillar factors of safety, (3) stress gradients associated with the approach of mining to areas of higher stress concentrations such as abutment stresses from multiple seam mining or anomalous geologic conditions, and (4) roof beam thickness, joint spacing, and stiffness characteristics, which influence cave conditions and dynamic loading. The latter variables, combined together to form a new variable called "strata rigidity-cavability", reflect some of the most important aspects of violent failure, i.e. having massive and stiff near-seam stratigraphic units capable of absorbing high strain energy, forming high stress on mine structures and poor cave conditions, and thus the potential for dynamic loads. The two new case studies not only verified the significance of above factors but also reemphasized the significance of in-situ coal strength in increasing propensity for violent failure. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Keywords:
  Author Keywords: Rock Burst Geotechnical Engineering Geotechnical Monitoring Ground Control Ground Stability Monitoring Systems Multiple Variable Regression Pillar Mechanics Rigidity/Cavability Rock Bursts Strata Control Underground Mines Underground Mining

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• Series:
  Mining Publications
• Publisher:
  Society for Rock Mechanics and Engineering
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  OSHA Region 10 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SMRD - Spokane Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-10
• NIOSHTIC Number:
  nn:20054145
• Citation:
  Proceedings of the 10th Asian Rock Mechanics Symposium, The ISRM International Symposium for 2018, October 29-November 3, 2018, Singapore. Lisbon, Portugal: Society for Rock Mechanics and Engineering, 2018 Oct; :1-10
• Contact Point Address:
  Hamid Malekia, NIOSH Spokane Mining Research Division, Spokane, WA
• Email:
  Maleki.tech@comcast.net
• Federal Fiscal Year:
  2019
• NORA Priority Area:
  Mining
• Peer Reviewed:
  True
• Source Full Name:
  Proceedings of the 10th Asian Rock Mechanics Symposium, The ISRM International Symposium for 2018, October 29-November 3, 2018, Singapore
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:f565a7d92f44b807ea8e10e1252b5848ea342703e0bd9ce559d17c5d352d0d6b4eba55d66b4fdff0fbe4a62bcdff03129e9bd05cd14bdf0dcdb95fcc305fcdfc
• Download URL:
  https://stacks.cdc.gov/view/cdc/227783/cdc_227783_DS1.pdf
• File Type:
  [PDF - 281.25 KB ]