Effects of Surface Topography, Strata Dip, and Casing Cementing on Longwall-Induced Subsurface Deformations and Gas Well Casing Stresses

Details

• Personal Author:
  Dougherty H ; Su, Daniel W. H. ; Van Dyke M ; Zhang P
• Description:
  This paper describes the scientific data acquisition, data interpretation, and sophisticated 3-dimensional modeling processes of an ongoing gas well stability research program by the National Institute for Occupational Safety and Health (NIOSH). Results from the NIOSH field instrumentation programs and the parallel 3-dimensional numerical modeling programs indicate that overburden depth, overburden geology, surface topographic relief, strata dip of the coal measure rocks, and casing cementing alternatives are the dominant factors affecting longwall-induced subsurface deformations and gas well casing stresses. Topographic relief could produce localized longwall-induced deformations if weak-to-strong rock interfaces are present near the bottom of stream valleys. Strata dip has significant impact on longwall-induced subsurface deformations. Cementing alternatives are found to have significant impacts on longwall-induced deformations and gas well casing stresses. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Geology Mining Occupational Health Safety
• Keywords:
  3D Cements Coal Mining Gases Ground Stability Longwall Mining Models Rock Mechanics Three Dimensional Topography
• Series:
  Mining Publications
• ISBN:
  9781713863700
• Publisher:
  Society for Mining, Metallurgy & Exploration (SME)
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PMRD - Pittsburgh Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  241-250
• NIOSHTIC Number:
  nn:20067518
• Citation:
  Proceedings of the 41st International Conference on Ground Control in Mining (ICGCM 2022), July 26-28, 2022, Canonsburg, Pennsylvania. Englewood, CO: Society for Mining, Metallurgy & Exploration (SME), 2022 Jul; :241-250
• Federal Fiscal Year:
  2022
• Peer Reviewed:
  False
• Source Full Name:
  Proceedings of the 41st International Conference on Ground Control in Mining (ICGCM 2022), July 26-28, 2022, Canonsburg, Pennsylvania
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:122295625af1cdbc7c58b7be05f42e724a01aeee191e26f814a7c498c90b453d276d760fa93f3f1e30cbf9554a7d3a2e0027e11566c3c24fd8474bfcbb07b13d
• Download URL:
  https://stacks.cdc.gov/view/cdc/215551/cdc_215551_DS1.pdf
• File Type:
  [PDF - 3.08 MB ]