NIOSHTIC-2 Publications Search
In the field - cribs versus cables.
Holmes Saf Assn Bull 1998 Mar; :5-6
A field site in the Eagle Coalbed served as the first full-scale test of a cable bolted cribless tailgate on a longwall in the eastern United States. The Pittsburgh Research Center completed this initial test in December 1995 at a mine in southern West Virginia. Previously, most cribless cable bolt test areas and usage had been in the Western United States. Generally, the immediate roof in the mine changes from a sandstone to shale. In the study area, the immediate roof consisted of massive, but small (45.7-61 cm (18-24 in)) sandstone layers separated by thin coal streaks. Primary roof support was 1.07 m (3.5 ft), grade 60, No. 6 resin bolts installed on 152-cm (5ft) centers using T-2 channels. Cables were 3.66 m (12 ft) with 1.52 m (5ft) of resin anchorage in rows of 1.2 m (4ft) on 1.8 m (6 ft) centers. Intentions were to locate the test site in what could be anticipated to be the worst ground conditions along the longwall panel within a given timeframe. As a result, the study site was positioned under a stream valley that had been assiciated with past ground control problems. The site was also under a longwall barrier pillar in the Upper Powellton Coalbed that had been previously mined.
Longwall-mining; Coal-mining; Cables; Underground-mining; Ventilation; Dusts; Ground-control; Mining-industry
Holmes Safety Association Bulletin
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division