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.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Help
Clear All

Query Builder

Query box

Help
Clear All

For additional assistance using the Custom Query please check out our Help Page

Filetype[PDF-231.26 KB]


Details You May Also Like

Details:

  • Corporate Authors:
    Pittsburgh Research Laboratory (National Institute for Occupational Safety and Health)
  • Description:
    Pillar design is the first line of defense against rockfalls—the greatest single safety hazard faced by under-ground coal miners in the United States and abroad. To help advance the state of the art in this fundamental mining science, the National Institute for Occupational Safety and Health organized the Second International Workshop on Coal Pillar Mechanics and Design. The Workshop was held in Vail, CO, on June 6, 1999,in association with the 37th U.S. Rock Mechanics Symposium. The Proceedings (IC 9448) include15 papers from leading ground control specialists in the United States, Canada, Australia, the United Kingdom, and the Republic of South Africa. The papers address the entire range of issues associated with coal pillars and have a decidedly practical flavor. Topics include numerical modeling, empirical design formulas based on case histories, field measurements, and post-failure mechanics. The titles of the papers in the Proceedings are: •A Unique Approach to Determining the Time-Dependent In Situ Strength of Coal Pillars •Developments in Coal Pillar Design at Smoky River Coal Ltd., Alberta, Canada •Coal Pillar Design for Longwall Gate Entries
  • Subjects:
  • Series:
    Technology news (National Institute for Occupational Safety and Health) ; 492
  • Document Type:
    Newsletter
  • Collection(s):
  • Main Document Checksum:
  • Download URL:
  • File Type:

Supporting Files

  • No Additional Files

More +

You May Also Like

Checkout today's featured content at stacks.cdc.gov