ICGCM Papers:
Roof Support Design and Evaluation
 
 
Application of Tensioned Cable Bolts for Supplemental Support
29th International Conference on Ground Control in Mining
Application of Tensioned Cable Bolts for Supplemental Support
by
Ben Mirabile, Jennmar Corporation of WV, Princeton, United StatesRodney Poland, Jennmar Corporation of WV, Morgantown, United StatesAlan Campoli, Jennmar Specialty of VA, Lexington, United States
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[Conference] 29th International Conference on Ground Control in Mining
[Price] Free  [Comments] 0
[Topical Area] Roof Support Design and Evaluation
[Author] Ben Mirabile, Jennmar Corporation of WV, Princeton, United StatesRodney Poland, Jennmar Corporation of WV, Morgantown, United StatesAlan Campoli, Jennmar Specialty of VA, Lexington, United States
[Abstract] The majority of U.S. underground coal mines use some form of cable bolt as supplemental support to a primary bolting system. Many coal operators employ the high load capacity of non-tensioned cable bolts, cable roof trusses, or solid bar trusses in an attempt to suspend the primary bolted horizon to overlying strata. However, in cases where many discontinuities exist in the roof strata or pre-existing fractures are present, these passive supplemental support systems often cannot adequately control roof deflection. This paper examines the application of tensioned cable systems to minimize roof deflection in very laminated and fractured strata. Two underground case studies are presented to demonstrate the application of tensioned cable bolts. One case study involves the rehabilitation of a longwall head gate in the Eagle seam with highly laminated and fractured sandstone. The other case study addresses rehabilitation of a longwall head gate in the Pittsburgh No. 8 seam subjected to horizontal stress concentration.