Welcome to CDC Stacks | The Unpredictable Life Cycle of a Coal Pillar - 9331 | National Institute for Occupational Safety and Health
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
Help
Clear All Simple Search
Advanced Search
The Unpredictable Life Cycle of a Coal Pillar
  • Published Date:
    0/1/1900
Filetype[PDF - 1.14 MB]


Details:
  • Description:
    A unique circumstance created by monitoring a pre-driven longwall recovery room permitted measuring the stresses of a coal pillar throughout its entire life cycle in less than a week. A fender pillar, created in approximately the middle of a longwall panel at a depth of 650 ft, transformed from a solid barrier pillar - to a yielding pillar - to a residual pillar as 3 ft slices were methodically removed with the longwall shearer. The complete transformation, or life cycle, took place in less than 12 hours. The stresses were quickly transferred from the pillar onto the standing pumpable concrete supports and into the outby pillars. Roof to floor closure measurements, combined with the timing of the pillar behavior, provides a detailed look at the uncontrollable convergence of underground mine openings. Pillars remain the most important form of primary support and understanding these life cycles is vital for safe and efficient mine design, in both room and pillar and longwall panel extractions.

  • Supporting Files:
    No Additional Files
No Related Documents.
You May Also Like: