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Das - Principles of Geotechnical Engineering 10/e (Homework)

James Finch

Engineering, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 20 / 20

Due : Sunday, January 27, 2030 12:00 EST

Last Saved : n/a Saving...  ()

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Question
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3/3 3/3 3/3 2/2 2/2 2/2 1/1 1/1 1/1 2/2
Total
20/20 (100.0%)

  • Instructions

    Principles of Geotechnical Engineering, 10th Edition, by Braja M. Das and published by Cengage Learning with WebAssign digital resources, provides a thorough overview of soil properties and mechanics as well as important coverage of the latest field practices and basic engineering procedures. This market-leading solution is ideal for the introductory course taken by most civil engineering students. It provides important background students need for later design-oriented courses and professional practice. The author's practical, application-oriented approach integrates comprehensive discussions and detailed explanations as well as more worked-out problems and problem examples than any other resource of its kind. WebAssign customizable online resources assist in guiding students through the material.

    Question 1 uses the specific gravity of the soil solids to calculate dry unit weight, void ration, and degree of saturation of a soil when given moist weight and moisture content.

    Question 2 determines the dry unit weight, specific gravity of the soil solids, and void ration of a soil when given moisture weight and moisture content.

    Question 3 determines the void ratio, specific gravity of the soil solids, and the saturated unit weight of a soil when given unit weight, moisture content, and degree of saturation.

    Question 4 calculates the saturated unit weight and the moisture content when given moist unit weight and soil porosity. Question 5 determines the moist and dry unit weights of a soil.

    Question 6 determines e and Gs of a soil with specific moist unit weights and degrees of saturation.

    Question 7 determines the volume of borrow material needed to construct a specific compacted backfill.

    Question 8 asks to determine the dry unit weight of a soil.

    Question 9 calculates the moist unit weight of compaction in a field.

    Question 10 calculates the dry unit weight of a sand and the decrease in the thickness of the fill. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. 3/3 points  |  Previous Answers DasPrincGeoEng10 3.3.003. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 1/1 1/1
3/100 5/100 2/100
Total
3/3
 
The moist weight of a soil is 18.1 kN/m3 and the moisture content is 13%. If the specific gravity of the soil solids is 2.69, calculate the following.
(a)
dry unit weight (in kN/m3)
Correct: Your answer is correct. seenKey

16

 kN/m3
(b)
void ratio
Correct: Your answer is correct. seenKey

0.647
(c)
degree of saturation (as a percentage)
Correct: Your answer is correct. seenKey

54

 %
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2. 3/3 points  |  Previous Answers DasPrincGeoEng10 3.3.005. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 1/1 1/1
2/100 2/100 2/100
Total
3/3
 
The saturated unit weight of a soil is 20 kN/m3. The moisture content of the soil is 19%. Determine the following.
(a)
dry unit weight (in kN/m3)
Correct: Your answer is correct. seenKey

16.8

 kN/m3
(b)
specific gravity of soil solids
Correct: Your answer is correct. seenKey

2.54
(c)
void ratio
Correct: Your answer is correct. seenKey

0.483
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3. 3/3 points  |  Previous Answers DasPrincGeoEng10 3.3.006. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 1/1 1/1
2/100 2/100 2/100
Total
3/3
 
The unit weight of a soil is 96 lb/ft3. The moisture content of this soil is 20% when the degree of saturation is 60%. Determine the following.
(a)
void ratio
Correct: Your answer is correct. seenKey

0.746
(b)
specific gravity of soil solids
Correct: Your answer is correct. seenKey

2.24
(c)
saturated unit weight (in lb/ft3)
Correct: Your answer is correct. seenKey

107

 lb/ft3
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4. 2/2 points  |  Previous Answers DasPrincGeoEng10 3.4.011. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
2/100 2/100
Total
2/2
 
The porosity of a soil is 0.37. Given
Gs = 2.69,
 calculate the following.
(a)
saturated unit weight (in kN/m3)
Correct: Your answer is correct. seenKey

20.3

 kN/m3
(b)
moisture content (as a percentage) when moist unit weight = 17.8 kN/m3
Correct: Your answer is correct. seenKey

7.07
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5. 2/2 points  |  Previous Answers DasPrincGeoEng10 3.3.014. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
2/100 2/100
Total
2/2
 
A soil has
w = 17.8%,
Gs = 2.67,
 and
S = 80%.
 Determine the moist and dry unit weights of the soil in lb/ft3.
dry unit weight   Correct: Your answer is correct. seenKey

105

 lb/ft3 moist unit weight   Correct: Your answer is correct. seenKey

123

 lb/ft3
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6. 2/2 points  |  Previous Answers DasPrincGeoEng10 3.3.016. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
2/100 2/100
Total
2/2
 
The moist unit weights and degrees of saturation of a soil are given in the table.
γ (lb/ft3) S (%)
106.6 50
112.0 75
Determine the following.
(a)
e
Correct: Your answer is correct. seenKey

0.529
(b)
Gs
Correct: Your answer is correct. seenKey

2.35
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7. 1/1 points  |  Previous Answers DasPrincGeoEng10 3.3.018. My Notes
Question Part
Points
Submissions Used
1
1/1
2/100
Total
1/1
 
Consider the following figure.
A concrete retaining wall holds compacted backfill (e = 0.71) in an excavation. Soil from the borrow pit (e = 1.05) is used for the backfill.
After the construction of a concrete retaining wall, backfill material from a nearby borrow pit was brought into the excavation behind the wall and compacted to a final void ratio of 0.71. Given that the soil in the borrow pit has a void ratio of 1.05, determine the volume (in m3) of borrow material needed to construct 1 m3 of compacted backfill. (Assume the specific gravity of the soil solids is 2.7.)
Correct: Your answer is correct. seenKey

1.2

 m3
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8. 1/1 points  |  Previous Answers DasPrincGeoEng10 3.6.020. My Notes
Question Part
Points
Submissions Used
1
1/1
2/100
Total
1/1
 
For a given sand, the maximum and minimum void ratios are 0.76 and 0.41, respectively. Given
Gs = 2.67,
 determine the dry unit weight of the soil in kN/m3 when the relative density is 60%.
Correct: Your answer is correct. seenKey

16.9

 kN/m3
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9. 1/1 points  |  Previous Answers DasPrincGeoEng10 3.6.021. My Notes
Question Part
Points
Submissions Used
1
1/1
2/100
Total
1/1
 
For a given sandy soil,
emax = 0.76,
emin = 0.42,
 and
Gs = 2.68.
 What will be the moist unit weight of compaction (in kN/m3) in the field if
Dr = 78%
 and
w = 6%?
Correct: Your answer is correct. seenKey

18.6

 kN/m3
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10. 2/2 points  |  Previous Answers DasPrincGeoEng10 3.6.024. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
2/100 2/100
Total
2/2
 
A loose, uncompacted sand fill 6 ft in depth has a relative density of 40%. Laboratory tests indicated that the minimum and maximum void ratios of the sand are 0.43 and 0.94, respectively. The specific gravity of solids of the sand is 2.65.
(a)
What is the dry unit weight of the sand (in lb/ft3)?
Correct: Your answer is correct. seenKey

95.3

 lb/ft3
(b)
If the sand is compacted to a relative density of 75%, what is the decrease in the thickness of the 6 ft fill (in inches)?
Correct: Your answer is correct. seenKey

7.4

 inches
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