A Parametric Study for the Effect of Dip on Stone Mine Pillar Stability Using a Simplified Model Geometry [2020]

Details

• Personal Author:
  Murphy MM ; Rashed G ; Sears MM ; Slaker B
• Description:
  In this study, a parametric study was conducted using FLAC3D numerical models to examine the impact of oblique loading, generated from seam dip, on the strength and the failure propagation pattern of a stone pillar using two simplified geometry types. In type-1 the side walls of the pillars were assumed to be perpendicular to the roof and the floor, while in type-2 the side walls of pillars were assumed to be vertical. The complex pillar geometry in dipping mines was frequently modeled using these two geometries. To capture a complete picture of the effect of seam dip on pillar stability, the modeled width-to-height (w/h) ratio of the pillars, in-situ stress field, and pillars roof/floor interfaces were systematically varied to account for the potential distribution of values for these parameters across the underground stone mines in United States. Results from the numerical modeling indicate that dipping pillars have reduced strength compared to horizontal pillars. Also, an asymmetric failure propagation pattern could be obtained depending on an interaction between the w/h ratio, seam dip, in-situ stresses, and pillar geometry. [Description provided by NIOSH]
• Subjects:
  Body Height Mining Occupational Health Safety
• Keywords:
  Environmental Control Environmental Stress Failure Analysis Floors Height Factors Horizontal Stress In Situ Mining Mathematical Models Models Pillar Design Pillar Mechanics Rock Mechanics Roof Supports Room And Pillar Mining Stone Mines Structural Analysis Structural Design Structural Engineering Structural Failure

  More +
• Series:
  Mining Publications
• Publisher:
  Society for Mining, Metallurgy and Exploration
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Arizona ; Colorado ; OSHA Region 3 ; OSHA Region 8 ; OSHA Region 9 ; 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:
  1-7
• NIOSHTIC Number:
  nn:20059693
• Citation:
  MineXchange: 2020 SME Annual Conference & Expo, February 23-26, 2020, Phoenix, Arizona, preprint 20-055. Englewood, CO: Society for Mining, Metallurgy & Exploration, 2020 Feb; :1-7
• Federal Fiscal Year:
  2020
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:396d1c3fb1eb6fbbb3968ddc14a5940e42376a2e3cc69e955babb42aabae3c0cf2a995cf375a201e421a9a0c9653694223e17c11829b8fddb6294ec442c48d39
• Download URL:
  https://stacks.cdc.gov/view/cdc/215268/cdc_215268_DS1.pdf
• File Type:
  [PDF - 1.12 MB ]