Rock Mass Modeling Approach for Simulating Wave Propagation, Rock Fracture, and Rock Ejection

Details

• Personal Author:
  Loken MC ; Raffaldi MJ
• Description:
  As part of an ongoing research effort to improve ground control safety in deep vein mines, researchers at the National Institute for Occupational Safety and Health (NIOSH), Spokane Mining Research Division (SMRD) have developed a simplistic approach to modeling dynamic behavior of rock using commercially available software. This methodology will be applied to study the behavior of underground excavations subjected to dynamic loading from remote seismic sources in order to better understand the relationship between seismic wave-parameters, rock mass damage, excavation stability, and ground-support demands. The potential exists to improve safety in burst prone ground through better understanding of the effects of seismic loads on excavations. This paper describes a preliminary one-dimensional investigation of the model that validates its performance and provides insight into the dynamic failure of rock. The main observation is that the dynamic stresses that develop in the rock near a free surface are different than those that occur within a constrained solid. In a constrained solid, the dynamic stresses are directly proportional to the velocity amplitude of the propagating wave. This study shows that in the vicinity of an unconstrained surface, the accelerations associated with a seismic wave are also important to understanding dynamic stress and rock ejection. As the wave passes, forces develop that are equal to the product of the mass and acceleration of the rock block attempting to eject. For a seismic wave of given peak particle velocity, higher frequencies will be associated with higher accelerations and have the potential to be more damaging to a rock surface. Increased use of dynamic modeling will develop knowledge of the effects of seismic loading on excavations and ground support and may lead to designs that better protect miners. [Description provided by NIOSH]
• Subjects:
  Environmental Exposure Lung Lung Diseases Mining Occupational Health Particulate Matter Respiratory System Respiratory Tract Diseases Risk Assessment Risk Factors Safety Silicon Dioxide Vehicle Emissions Ventilation

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• Keywords:
  Acceleration Amplitude Coal-mining Coal Mines Computer Models Computer Programs Computer Software Environmental-control Environmental-stress Environmental Monitoring Excavations Failure Analysis Force Geology Ground-control Ground-stability Ground Falls Ground Monitoring Kinetic Energy Kinetics Mathematical Models Mining-industry Models Rock-mechanics Rock Bursts Rock Falls Strata Control Structural-analysis Underground-mining Wave Propagation

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• Series:
  Mining Publications
• ISBN:
  9781510828025
• Publisher:
  American Rock Mechanics Association (ARMA)
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Minnesota ; OSHA Region 10 ; OSHA Region 5 ; OSHA Region 6 ; Texas ; 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:
  132-143
• Volume:
  1
• NIOSHTIC Number:
  nn:20049289
• Citation:
  50th US Rock Mechanics/Geomechanics Symposium, June 26-29, 2016, Houston, Texas. Alexandria, VA: American Rock Mechanics Association (ARMA), 2016 Jun; 1:132-143
• Federal Fiscal Year:
  2016
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:b71823bf86ddc92df7e69e7a530301a88adf6ca061a422607770797a73db08c3666c084940f1b374f76fb972624d980aadd3b62f6a09d1c1c3bfac619315a7d8
• Download URL:
  https://stacks.cdc.gov/view/cdc/228367/cdc_228367_DS1.pdf
• File Type:
  [PDF - 143.58 KB ]