Combined Effects of Rock Bedding Orientation and Topography on Stresses Around Mine Openings

Details

• Personal Author:
  Griffith WA ; Molavi Tabrizi A ; Pan E ; Zhao Y
• Description:
  In this paper we introduce a realistic model for mine openings that explicitly considers the effects of local irregular topography. Also, we consider the effect of entry orientation and rock anisotropy on the induced stress fields around mine openings under the given in-situ stress field. A triangular mesh formulation is derived for representing complicated irregular surface topography and underground openings. Each element contains three internal collocation nodes. Parts of the surface which are far from the mine openings are discretized by infinite elements. The rectangular infinite elements with three internal nodes are introduced specifically for this problem so they are compatible with the triangular elements. With the corresponding boundary element method (BEM) formulation, we then investigate the combined effect of the topography and entry orientation on the stress fields induced by openings in anisotropic rocks under in-situ stresses. A single rectangular opening in the anisotropic ground with topography and in-situ stresses is simulated using data from the Carroll Hollow mine in Ohio. The results of these simulations show that topography, rock anisotropy, orientation of the regional stress field and mine opening geometry all have appreciable effects on the stress fields around underground openings, yet these factors can all be accounted for in an efficient code with no need to discretize the model domain. Future applications using this new BEM formulation will provide useful guidance on selecting the optimal opening orientation in the mine in order to minimize undesirable stress concentrations around underground mine workings. Description provided by NIOSH
• Subjects:
  • Coal
  • Coal Mining
  • Mining
  • Occupational Health
  • Safety
• Keywords:
  • Topography
  • Underground mining
  • Underground construction
  • Geologic surveys
  • Mining engineering
  • Models
  • Rock mechanics
  • Ground stability
  • Coal mining
  • Simulation methods
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Proceedings
• Place as Subject:
  Ohio ; OSHA Region 5 ; OSHA Region 6 ; Texas
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-5
• NIOSHTIC Number:
  nn:20053118
• Citation:
  Proceedings of the 33rd International Conference on Ground Control in Mining, July 29-31, 2014, Morgantown, West Virginia. Morgantown, WV: West Virginia University, 2014 Jul; :1-5
• Federal Fiscal Year:
  2014
• NORA Priority Area:
  Mining
• Performing Organization:
  University of Texas at Arlington
• Peer Reviewed:
  False
• Start Date:
  20121122
• Source Full Name:
  Proceedings of the 33rd International Conference on Ground Control in Mining, July 29-31, 2014, Morgantown, West Virginia
• End Date:
  20150831
• Download URL:
  https://stacks.cdc.gov/view/cdc/215944/cdc_215944_DS1.pdf
• File Type:
  [PDF - 722.71 KB]
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6f67510cca42249d5a98523a51b56e2007450eb53dd6c64f5fa291270039f39610c69b0a24bf33a30c45659ea1ade43bf3db6275d34769e7141738da973f0c1f