Three-dimensional shield mechanics. Report of investigations/1987
The report describes research on developing technology to utilize shields as roof-load monitors. Three-dimensional equations of static equilibrium are presented for a generic two-legged longwall shield. The equations are presented in the most general form, assuming a force and moment vector at each reaction by rigid-body analysis of the shield mechanics. The resulting system of equations was found to be indeterminate to a very high degree. A three-dimensional solution to measurement of the resultant reaction on the canopy by the strata activity and shield response required the elimination of several forces or moments that were thought to be nonparticipating or to not significantly affect overall shield mechanics. Required measurements for solution of the equilibrium equations were leg, canopy capsule, and lemniscate link forces. Two-dimensional analysis, which considered forces acting only in the roof-to-floor and face-to-waste plane, was also provided by reduction of the three-dimensional equations.
- Research Organization:
- Bureau of Mines, Pittsburgh, PA (USA). Pittsburgh Research Center
- OSTI ID:
- 5702678
- Report Number(s):
- PB-88-109749/XAB; BM-RI-9091
- Resource Relation:
- Other Information: Library of Congress catalog card no. 87-600011
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL MINING
LONGWALL MINING
ROOFS
SHIELD SUPPORTS
THREE-DIMENSIONAL CALCULATIONS
LAYERS
MATHEMATICAL MODELS
MECHANICAL STRUCTURES
MINING
POWERED SUPPORTS
SUPPORTS
UNDERGROUND MINING
012031* - Coal
Lignite
& Peat- Underground Mining- Strata Mechanics & Control- (1987-)