Improved roof support for seam drivages and gate roads
The objective of the research project was to improve existing support elements and systems, looking in particular into causes of failure in yielding arch support. Model tests were done to determine relationships between arch geometry and expected deformation, and full scale tests to investigate how profile weight, profile type, steel quality and connector shape affect load-bearing and deformation characteristics of yielding arches in gate roads. Taking account of expected convergence rates, roadway type, rock category and contact area, a four-component yielding arch can be best matched to the expected deformation, provided the critical width-to-height ratio is not exceeded. Original 34 kg arches behave better under load and deformation than 36 kg arches. Yielding arches made of annealed steel are better than those made of untreated steel. A more even bolting torque distribution and improved yielding properties were achieved. Bolt support with full-load capacity lagging was developed, which allows higher roadway convergence than does rigid bolt support. Mortars were improved, taking into account the large portion of power-station waste, and the difficulties involved in transport from the surface to the processing location.
Bibliographic Reference: EUR 14079 DE (1992) 176 pp., MF, ECU 8, blow-up copy ECU 30
Record Number: 199210787 / Last updated on: 1994-12-02
Original language: de
Available languages: de