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Mining Publication: Evaluation of Polyurethane Injection for Beltway Roof Stabilization in a West Virginia Coal Mine
Keywords: Polyurethane Roof falls Room and pillar mining West Virginia
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: August 2004
Authors: GM Molinda
Conference Paper - August 2004
Download PDF Document (0.37 MB)
NIOSHTIC2 Number: 20025348
In: Peng SS, Mark C, Finfinger GL, Tadolini SC, Heasley KA, Khair AW, eds. Proceedings of the 23rd International Conference on Ground Control in Mining, August 3-5, 2004. Morgantown, WV: West Virginia University, 2004 Aug; :190-196
Extremely difficult ground conditions were encountered in the main belt entry in a room-and-pillar mine in West Virginia. Several generations of supplemental support, including cable bolts, cribbing, and Heintzmann jacks and beams, failed to halt roof falls that threatened workers' safety and the life of the mine. Polyurethane (PUR) was injected into 27 intersections in the roof, and the results were monitored by borehole video camera. The mine had averaged two to three falls in the beltway per year. Since the roof injection, no roof falls have occurred. Pre- and post-injection monitoring of test holes showed that stability can be achieved without filling all of the existing void spaces. Video logging showed that the project goal of building a beam from 2 to 6 ft into the roof was successful. Pre-injection monitoring of roof fractures uphole can delineate the zones to target for reinforcement and avoid pumping PUR into large voids to little effect. Multiple-injection zones can be identified, and the entire intersection drill hole array can be optimized based on knowledge of the fractured zones. In addition, pre-monitoring can prevent excessive hydrofracturing in solid zones. Polyurethane injection is a proven method of rock stabilization in even the weakest, most broken ground. Optimization of the injection design by preinjection video diagnostics can greatly contribute to successful and efficient roof stabilization.
Image of publication Evaluation of Polyurethane Injection for Beltway Roof Stabilization in a West Virginia Coal MineConference Paper - August 2004
Download PDF Document (0.37 MB)
NIOSHTIC2 Number: 20025348
In: Peng SS, Mark C, Finfinger GL, Tadolini SC, Heasley KA, Khair AW, eds. Proceedings of the 23rd International Conference on Ground Control in Mining, August 3-5, 2004. Morgantown, WV: West Virginia University, 2004 Aug; :190-196
See Also
Field Observations and Numerical Studies of Horizontal Stress Effects on Roof Stability in U.S. Limestone Mines
Make it Safer with Roof Screen
Multiple Seam Mining Interactions: Case Histories from the Harris No. 1 Mine
Multiple-Seam Mining Interactions: Case Histories from the Harris No. 1 Mine
Optimizing Secondary Roof Support with the NIOSH Support Technology Optimization Program (STOP)
Overview of Coal Mine Ground Control Issues in the Illinois Basin
Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines
Pillar Strength and Design Methodology for Stone Mines
Support Design Procedures for Difficult Ground Conditions
Technology News 483 - Safety Training Tools for Rock Scaling Personnel
Page last reviewed: November 19, 2015
Page last updated: November 19, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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