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Mining Publication: Standing Support Alternatives in Western Longwalls
Keywords: Cans Pumpable roof supports Support design and selection Tailgates Wood cribs
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: February 2005
Authors: TM Barczak, SC Tadolini
Conference Paper - February 2005
Download PDF Document (0.99 MB)
NIOSHTIC2 Number: 20026232
2005 SME Annual Meeting, February 28 - March 2, Salt Lake City, Utah, preprint 05-78. Littleton, CO, Society for Mining, Metallurgy, and Exploration, Inc., 2005 Feb; :1-10
Western U.S. mines have had limited choices for standing support. Wood cribs were often too soft and unstable. The introduction of the Can support in the early 1990s provided a very effective alternative and remains the dominant form of tailgate support. Water-filled prestressing cells are now used to cap the Can and preload it to provide an active roof load. The Cluster Prop, consisting of three timber wedge props bundled together, provides more capacity than an equivalent-sized Can support and improves transport efficiency. However, the Cluster Prop is less stable and does not maintain a consistent load throughout its loading profile. Pumpable roof supports are another alternative support, but they have not been proven in high-deformation environments. Alternative supports are also being used in longwall recovery operations. These include the Rocprop and Omni Prop, which are extendable support systems. They also provide active roof loading, which can be beneficial in these applications. Specialty supports, such as the Sand Prop and Spider Prop, have also been introduced into western longwall operations. This paper compares the performance characteristics of these various support systems.
Image of publication Standing Support Alternatives in Western LongwallsConference Paper - February 2005
Download PDF Document (0.99 MB)
NIOSHTIC2 Number: 20026232
2005 SME Annual Meeting, February 28 - March 2, Salt Lake City, Utah, preprint 05-78. Littleton, CO, Society for Mining, Metallurgy, and Exploration, Inc., 2005 Feb; :1-10
See Also
Case History of the Response of a Longwall Entry Subjected to Concentrated Horizontal Stress
Design Methodology for Standing Secondary Roof Support in Longwall Tailgates
Development of Ground Response Curves for Longwall Tailgate Support Design
Evaluation of the Impact of Standing Support on Ground Behavior in Longwall Tailgates
A First Step in Developing Roof Support Design Criteria Based on Ground Reaction Data for Pittsburgh Seam Longwall Tailgate Support
Longwall Tailgates: The Technology for Roof Support Has Improved, but Optimization is Still Not There
Pumpable Roof Supports: Developing Design Criteria by Measurement of the Ground Reaction Curve
Rock Mass Behavior and Support Response in a Longwall Panel Pre-Driven Recovery Room
Standing Support Alternatives in Western United States Longwalls
Technology News 467 - Wood Crib Performance Model
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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