Q) A Caterpillar 631 E tractor scraper has the following characteristics:
Maximum heaped volume = 19.6 Bm3 Maximum payload = 34,000 kg The material hauled is earth with a density of 1825 kg/Bm3
Rolling resistance is 40 kg/t and operating conditions are average with a job efficiency of 45 min/hour.
The haul route comprises of the following sections:
Section 1 (200m) level-loading zone
Section 2 (1000m) 5% down grade
Section 3 (150m) level dumping zone
Section 4 (1000m) 5% up grade
Section 5 (50m) level turnaround area.
Estimate the machines production under these conditions using the travel time curves given in the Caterpillar Performance handbook.
Q) Working Bench.
Consider a mining sequence on a working bench.
a. Define the width of a working bench with a neat sketch.
b. Design a working bench when a single shovel of 6.8m3 capacity details of which are supplied in the notes with single spotting is used: Given:
i. design bench height =15m
ii. shovel will move along one line parallel to the bench face
iii. bench face angle 65°
iv. parallel cut will be used with turn and back
v. single spotting
vi. haulage by 50 tonne capacity truck
vii. truck width = 5.5m
viii. truck tyre rolling radius = 1.2 m
ix. a safety berm is required