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16-76 Edition 47
Hydraulic
Mining Shovels
Ground Pressures
GROUND PRESSURE
The ground pressure specifies the specific weight load
transferred to the surface, and can be an indicator for
the stability against subsidence. Though such conditions
typically apply to smaller excavators in heavy earthmov-
ing operations, there could be rare instances where this
may apply in mining applications. Nevertheless, the vast
majority of hydraulic mining shovels are delivered with
standard track shoes.
The value is determined by setting the machine weight
force in relation to the ground contact area of the tracks.
Ground Contact Area
Keys
A = Width of standard track shoe
B = Track length, idler center to sprocket center
C = Overall track length, grouser bar to grouser bar
To define the ground contact area on soft ground the
following formula is applied:
2 × A × (B + (C – B) × 0.35)
Optional Track Pads
In addition to the standard track shoes, optional
track pads with different widths are available; however,
these optional track pads are only procured on machine
orders, and may therefore effect the lead time of the entire
hydraulic mining shovel. Furthermore, a front shovel
(FS) configured machine equipped with wider track pads
increases the risk of track pad damage frombucket strikes.