Develop an Earth Moving Plan for a Highway Project - Engineering Assignment Help

Assignment Task

SECTION 1 – GENERATING A MASS DIAGRAM 
You are to develop an earthmoving plan for a highway project. The cross-section views of the cut and fill sections are shown below. Data on the existing grades (EG), proposed grades (PG), right shoulder elevation (RSE), cross section slopes (rise/run), and roadway widths (w) are shown in the table. Determine the end areas, the fill and cut volumes, and the mass ordinate in the table below. Using this information, answer the questions that follow. Assume the shrinkage factor is 0.91 and the swell factor is 1.1. Note that all fills shall be considered negative quantities and all cuts shall be considered positive quantities.


FILL SECTION
Station EG (ft) PG (ft) Slope RSE (ft) Width (ft) ?h (ft) Cut End Area (sf) Fill End Area (sf) CUT VOL. (bcy) FILL VOL. (ccy) FILL VOL. (bcy) Mass Ordinate (bcy)
0 993 1012 0.25 -- 80   0 -2964 0 0 0 0
100 991 1006 0.25 -- 80   0 -2100 0 -9378 -10904 -10904
200 1001 1001 0.25 -- 80   0 0 0 -3889 -4522 -15426
300 1008 989 0.25 993 80   3508 0 6496 0 0 -8930
400 1111 981 0.25 994 80   90844 0 174726 0 0 165796
Complete the table. (10 points)
What is the total amount of material that needs to be imported / exported? (2 point)
SECTION 2 – USING MASS DIAGRAMS AS A TOOL FOR ESTIMATING PRODUCTION AND COSTS (Total 12 points)
The following profile view and mass diagram was developed for an upcoming project. Using this information, answer the following questions.


What is the amount of earth material that needs to be hauled in haul zone 2 (HZ2)? (2 pts)
What is the amount of earth material that needs to be hauled in haul zone 5 (HZ5)? (2 pts)
In which haul zone (HZ) is the most earth material moved? (2 pt.)
What is the approximate average haul distance in haul zone 3 (HZ3)? (3 pts)
What is the approximate maximum haul distance in haul zone 3 (HZ3)? (3 pts)
SECTION 3 – SCRAPERS AND SCRAPER PRODUCTION (Total 25 points)
A CAT 631G single engine scraper and a D10 dozer will be used to move earth on a project. Answer the questions using the information provided below. Speed curves and other charts are provided in CAT Manual on canvas. Please attached the charts and tables clearly showing the selected values.

The empty weight of the scraper is 105,000 lbs and the heaped capacity is 34 lcy. The bank unit weight of the earth being hauled is 100 lbs/ft3 and the swell factor is 1.14. The tire penetration is 1 inch for both loaded and unloaded states.
Determine the weight of the scraper when completely loaded with earth (2 pts)
Complete the table (6 pts)
Haul Section Haul Distance (ft) Scraper State Grade Resistance (%) Rolling Resistance (%) Total Resistance (%) Travel Speeds (mph) Travel Time (min)
A 1000 Loaded -8 3.5 1.5 34 0.084
B 1250 Loaded -16 3.5 -2.5 33 0.138
C 250 Loaded -2 3.5 1.5 34 0.084
C 250 Unloaded 2 3.5 5.5 22 0.129
B 1250 Unloaded 16 3.5 9.5 12 0.379
A 1000 Unloaded 8 3.5 5.5 22 0.129
Determine the overall cycle time for the scraper. (2 pts)
Determine the overall cycle time for the pusher (2 pts)
Determine the number of scrapers per dozer for:
A scraper-controlled operation (1pt)
A dozer-controlled operation (1pt)
Determine the production for the
A scraper-controlled operation (1pt)
A dozer-controlled operation (1pt)
For the same scraper and conditions, assume the following to answer the remaining questions
Twenty-one 631G scrapers are available; maximum efficiency is 100%
Scraper cycle time is 9.3 minutes
Pusher cycle time is 1.6 minutes; maximum efficiency is 100%
Compactor single drum width is 3.8 feet, the average compacting speed is 5 mph, the lift thickness is 8 inches, the number of passes required for compaction is 3, and the maximum efficiency is 100% for the compactors
Swell factor is 1.14 and shrinkage factor is 0.95
1.37 million bcy need to be moved
Using the maximum number of scrapers available, how many days (8 hrs) will it take to move the material? (3 pts)
How many pushers are needed to support the production rate of the scrapers? (2pts)
How many compactors are needed to support the production rate of the scrapers? (2pts)
If the cost of a scraper is $500/day, the cost of the compactor is $450/day, and the cost of the pusher is $300/day, what is the unit cost to move this material? (2 pts)
SECTION 4 – EXCAVATOR-HAULER PRODUCTION (Total 25 pts)
A 320D excavator with a heaped bucket capacity of 3 cubic yard bucket will be used to excavate hard tough clay. The excavator will load haulers and the haulers will travel 3500 feet from the loading area to the dump site. The haulers will return on the same haul road. The hauler capacity is 12 cy. The average speed over the haul segment will be 15 miles per hour and over the return segment (empty) will be 29 miles per hour. Assume the truck will take 2 minutes to maneuver and dump its load. The efficiency of the entire operation is 55 minutes per hour. The swell factor for the material is 1.10. Use average values when ranges are provided in the tables or graphs.
What is the fill factor for the excavator bucket? (3 pts)
What is the cycle time, in seconds, for the excavator? (2 pts)
What is the production of the excavator, in bank cubic yards per hour (bcy/hr)? (3 pts)
Assuming that the gravimetric capacity of the hauler will not be exceeded, how many excavator bucket-loads per hauler should be assessed to determine optimal productivity? (2 pts)
What is the total hauler cycle time, in minutes? (2 pts)


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