Estimate the machines production under these conditions

Question

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