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JSIR Vol.66 [2007] >
JSIR Vol.66(06) [June 2007] >
| Title: | A model for extended bench casting in dipping coal seam |
| Authors: | Erdem, Bülent
Duran, Zekeriya |
| Keywords: | Dragline
Extended benching
Pit geometry |
| Issue Date: | Jun-2007 |
| Publisher: | CSIR |
| IPC Code: | E02F3/48 |
| Abstract: | This paper deals with extended bench casting with draglines in surface coalmines. A computer model, developed for
panel design, covers three fundamental operating modes: i) level casting for flat-lying coal seam; ii) downhill casting; and iii)
uphill casting for inclined coal seam conditions. Influence of pit width on critical pit dimensions such as cut length, dragline
reach on key cut and main cut positions, swing angles on key cut and main cut positions and rehandle percentage is critically
studied. The model is equipped with a device to determine total number of points within a cut on which dragline is placed.
With another module, walking pattern of dragline between adjacent cuts is decided. The model indicates that coal seam
inclination significantly influences dragline productivity. All things being equal, the uphill operation mode demands larger
dragline dimensions. Extended bench construction in uphill casting is easier and faster as less material is required. Besides,
dragline operates on a safe bench. As coal seam gets inclined, a large dragline may switch from extended benching in downhill
mode to direct casting owing to the room available for spoil piles increases with coal seam inclination. However, a small
dragline would likely fail to operate in downhill mode as the size of the extended bench would expand faster than the waste
available in the cut. Besides, dragline would not be adversely affected by failures occurring in spoil piles. It has been observed
that in extended benching practice with an inclined coal seam downhill casting should be considered first. |
| Page(s): | 435-443 |
| ISSN: | 0022-4456 |
| Source: | JSIR Vol.66(06) [June 2007]
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