Tutorial Two (1)

.docx

School

Western Sydney University *

*We aren’t endorsed by this school

Course

----

Subject

Civil Engineering

Date

Jun 5, 2024

Type

docx

Pages

Uploaded by KidEnergyFish29

Tutorial 2 Over-pass design Tutorial Two page CIVL2016 Civil & Substructure

In Tutorial 2, you will designing the tied-earth embankment at the start of the overpass at:  O’Connell Street for the Kingswood campus light rail  James Ruse Drive for the Parramatta (Rydalmere) campus light rail You will also be discussing the background theory, which you will need to include in Submission Two. Part 1. Compaction operations The fill for the embankment must be compacted to 95% of maximum dry density from the Standard Proctor test. Proctor densities You will have to calculate the dry density of each Standard Proctor test that you performed in Practical Two. Moisture content of each sample: 1. The weight of the Moist soil ( m 4 ) [grams] is the difference between the Dish-Moist soil ( m 2 ) and the Empty dish ( m 1 ): 2. The weight of the Dry soil ( m 5 ) [grams] is the difference between the Dish-Dry soil ( m 3 ) and the Empty dish ( m 1 ): 3. The Moisture ( m 6 ) [grams] is the difference between the Moist soil ( m 4 ) and Dry soil ( m 5 ): 4. The Moisture Content ( m %) is the division of the Moisture ( m 6 ) [grams] by the Dry soil ( m 5 ) [grams]. It is expressed as a percentage. 5. Complete Table 1 on the page 4 in pen. Dry density of each sample: 6. The moist weight of compacted soil ( w 4 ) in the Proctor mould is the difference between Mould + Compacted soil ( w 2 ) and the empty Mould ( w 1 ): 7. The dry weight of compacted soil ( w 5 ) is obtained from the moist weight, when you adjust for the moisture content: Tutorial Two page

8. The dry density  d is the division of the dry weight by the volume of the standard Proctor mould ( V = 9.44  10  4 m 3 ) : 9. Complete Table 2 on page 4 in pen. Maximum density 10. Plot the densities of each sample against its moisture content in Figure 1 on page 4. 11. Draw a curve of best fit between the four plotted points. 12. From the curve of best fit, identify the maximum dry density and its corresponding moisture content on Figure 1 of page 4. 13. Scan page 4 with your scanner or smart phone and insert the image in the Submission Two file. Discussion questions b. Ask your tutor why there is a maximum density . There is a discussion question in the Submission Two file about this. c. You will have to distinguish between the Standard Proctor test and the Modified Proctor test in Submission Two. d. As a research exercise on the internet, you will need to determine how civil contractors measure the soil density on site. You will have to describe in Submission Two how they check that an embankment is compacted to 95% of the maximum dry density. Tutorial Two page

Sample 1 Sample 2 Sample 3 Sample 4 Empty dish ( m 1 ) Dish-Moist soil ( m 2 ) Dish-Dry soil ( m 3 ) Moist soil ( m 4 ) Dry soil ( m 5 ) Moisture ( m 6 ) Moisture Content ( m %) Table 1 Sample moisture contents % ; ; ; Sample 1 Sample 2 Sample 3 Sample 4 Empty mould ( w 1 ) Mould + Moist compacted soil ( w 2 ) Moist compacted soil ( w 4 ) Dry compacted soil ( w 5 ) Dry density (  d ) Table 2 Dry densities [ kg/m 3 ] ; ; 0% 5% 10% 15% 20% 25% 30% 0 500 1000 1500 2000 2500 Moisture content Dry density [kg/m3] Figure 1 Dry density versus Moisture content Tutorial Two page

Spoil volume You must estimate the amount of loose spoil, that is needed for the overpass embankment. You will need to estimate the volume of soil which must be shifted from the excavation pit. Embankment Volume From the embankment drawings on the vUWS site, calculate the volume of the embankment in m 3 . The shape is irregular, so you will need to consult your tutor to work out the volume. Volume = WxHxL / 2 3.5m x 5.7m x 114m = 2274.3 2274.3 / 2 = 1137.2 (m3) Compaction factor The moist weight of loose soil [Sample 1] ( w 6 ) in the Proctor mould is the difference between Mould + Loose soil ( w 3 ) and the empty Mould ( w 1 ): W6 = 5.055 – 3.898 = 1.157 Dry weight of loose soil ( w 7 ) [Sample 1] is obtained by factoring with the moisture content (Sample 1): W7 = 1.157/ (1 +17/100) = 0.988 The dry weight of an optimum compacted sample ( w 8 ) is the product of 95% maximum density and the mould volume ( V = 9.44  10  4 m 3 ) : 0.95 x 1849.5 x V = 1.659 Tutorial Two page

The Compaction ratio measures either the reduction in volume for a constant weight OR the increase in weight for a constant volume. The two ratios are equivalent. So the Compaction ratio r c is the division of the dry loose soil weight ( w 7 ) by the dry compacted soil weight ( w 8 ): Rc = 0.988/1.659 = 0.596 Spoil Volume The volume of spoil involves factoring the embankment volume by the compaction ratio: 1137.2 (m3) / 0.596 = 1908.53 Truck trips For the design haulage volume of your selected dump truck, calculate the number of trips that are required to deliver the spoil to the embankment. Use the dump truck from Submission One. Truck being used – Komatsu Australia - H300-5 Dump Truck Truck capacity (m 3 ) = 28 tonnes 1908.53/28 = 69 trips Scan pages 5 and 6 with your scanner or smart phone and insert the images in the Submission Two file. Tutorial Two page

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version