soil mechanics questions

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CE 343 Soil Mechanics Homework No. 5 (Due on Tuesday, Feb.14) 1. A land development site requires borrowing soil to fill a 200,000 yd3 depression. The borrow soil has a total unit weight γ = 115 pcf, water content w = 25%, specific gravity of solids Gs = 2.7. Standard Proctor test of the borrow soil yield a maximum dry unit weight of γdmax =112 pcf. The fill material is required to be compacted to 95% of the maximum dry. The cost to excavate the borrow soil is $0.20/yd3 and cost to haul the soil is $0.30/yd3. Assuming the void ratio of soil during transportation is 0.92, determine the total cost to excavate and transport the soil. 2. The following laboratory test data were obtained for a soil sample: Sample volume Sample weight Dry sample weight Specific gravity of solids 15.5 cm3 30.5 g 25.0 g 2.7 Determine the void ratio and degree of saturation of this sample. 1 CE 343 Soil Mechanics Homework No. 4 (Due on Tuesday, Feb.12) 1. A soil sample was collected from a local site. Sieve analysis (ASTM D 422) and Atterberg limits (ASTM D4318) tests were conducted on the soil and results are listed in Table 1. (a) Plot the soil’s GSD on a semi-log graph. (b) Classify the soil using the USCS system. (c) Classify the soil according to AASHTO system. Table 1. Soil index testing summary D422 D4318 Sieve No. % Retained LL PL 10 0 30 2.1 40 2.8 60 17.2 18 15 100 46.6 120 8.8 200 12.5 Pan 9.8 2. Standard Proctor (ASTM D698) and modified Proctor (ASTM D1557) tests were conducted on the soil in Problem 1. The specific gravity of solids for this soil is Gs = 2.65. The results of the Proctor tests are presented in Table 2. Determine the following: (a) Plot the compaction results and the zero air voids curve for both Proctor tests. Determine the maximum dry unit weight (γd,max) and optimum moisture content (OMC) from both the standard and modified Proctor test results. (b) Determine the target γd,field and water content range for a 95% relative compaction requirement based on standard Proctor test results. (c) Determine the target γd,field and water content range for a 95% relative compaction requirement based on modified Proctor test results. (d) What type(s) of compaction equipment/roller should you recommend a contractor use to compact this soil? Table 2. ASTM D698 and D1557 test results on soil sample Point 1 2 3 4 5 6 D698 ω (%) total γ (pcf) 5.5 111.2 8.6 115.2 11.0 118.5 13.7 121.8 18.2 123.5 D1557 ω (%) total γ (pcf) 5.8 114.9 8.2 118.5 10.7 124.0 13.2 126.0 15.4 125.4 17.7 124.5 1 3. The soil from Problem 1 was selected for use on the construction project. The first soil lift was placed and field compaction tests were conducted in accordance with the project specifications at different locations. The results of the field measurements on the first soil lift are presented in Table 3. Determine the following: (a) The relative compaction at the field test locations with respect to both the standard and modified Proctor tests. (b) Do the field compaction test locations meet the project specifications? The project specifications state that placed soil should be compacted to at least 95% of ASTM D1557. (c) If the soil does not meet the project specification compaction requirements, what recommendations would you provide the contractor such that he/she can meet the requirements? Be specific for each location. Table 3. Field measurements on compacted soils at various locations Column Location total γ (pcf) ω (%) K-1 K-2 K-3 K-4 K-5 121.7 123.6 123.8 126.9 121.8 14.1 11.2 12.5 10.8 13.0 2
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Your delivery is enclosed. If there are any problems, please let me know. I'll get back to you as soon as I can.Please contact me if you or your friends need any kind of help.I really underestimated the work. The task was very involving and took bulk of my time. Anyway, i have attached everything even excel file which i believe can help you to understand all the concepts better.Thanks again and have a great day! :)

Sieve Analysis Data Sheet
ASTM D422-63(2007)
Project Name:

Tested By:

Date:

Location:

Checked By:

Date:

Boring No:

Test Number:

Sample Depth:

Gnd Elev.:
USCS Soil Classification:
AASHTO Soil Classification:

Weight of Container (g):

Weight of Container & Soil (g):

Weight of Dry Sample (g):
Sieve Number

Diameter
(mm)

Mass of Sieve Mass of Sieve Soil Retained Soil Retained
(g)
& Soil (g)
(g)
(%)

Soil Passing
(%)

Pan
TOTAL:
GRAVEL

% Passing

100

#4

Coarse #10
SAND

Medium
SAND

90
Sieve

Diameter
(mm)

% Passing

80
4
10
70
40
60
200
504
10
40
40
200
30

4.75
2
0.425
0.075
4.75
2
0.425
0.075

100
100
100
100
0
0
0
0

Fine
SAND

#40

#200

SILT/CLAY

% Passing

20
10
0
10.00

1.00

0.10

0.01

Particle Diameter (mm)
Grain Size Distribution Curve Results:
% Gravel:
% Sand:
% Fines:

D10:
D30:
D60:

14.333 Sieve Analysis Worksheet

Revised 02/13

Cu :
Cc:

__ of __

14.333 Sieve Analysis Worksheet

Revised 02/13

__ of __

ASTM D422-63(2007)
SP - SM _ Poorly Graded Sand with Silt

USCS Soil Classification:

A-2-4

AASHTO Soil Classification:

Sieve Number

Diameter
(mm)

Soil Retained
(%)

Soil Passing
(%)

2.00
0.60
0.42
0.25
0.15
0.13
0.074

0.0
2.1
2.8
17.2
46.6
8.8
12.5
9.8
99.8

100.0
97.9
95.1
77.9
31.3
22.5
18.8
0.0

#10
#30
#40
#60
#100
#120
#200
Pan

GRAVEL

100

Coarse #10
SAND

Medium
SAND

#30

#60 Fine #100
SAND

#200

SILT/CLAY

90

% Passing

80
70
60
50
40
30
20
10
0
10.00

1.00

0.10

0.01

Particle Diameter (mm)
Grain Size Distribution Curve Results:
% Gravel:
% Sand:
% Fines:

14.333 Sieve Analysis Worksheet

0
90
9.8

Revised 02/13

D10:
D30:
D60:

0.074
0.25
0.42

Cu :
Cc:

__ of __

ASTM D422-63(2007)
SP - SM _ Poorly Graded Sand with Silt
A-2-4

0.01

5.68
2..01

14.333 Sieve Analysis Worksheet

Revised 02/13

__ of __

ASTM D698
w (%)
ϒ (pcf)
5.5
111.2
8.6
115.2
11
118.5
13.7
121.8
18.2
123.5

Point
1
2
3
4
5
6

w (%)
5.5
8.6
11
13.7
18.2

ϒd (pcf)
105.4028
106.0773
106.7568
107.124
104.4839

ϒd (pcf)
105.4028436
106.0773481
106.7567568
107.1240106
104.4839255

ASTM D1557
w (%)
ϒ (pcf) ϒd (pcf)
5.8
114.9 108.601
8.2
118.5 109.519
10.7
124 112.014
13.2
126 111.307
15.4
125.4 108.666
17.7
124.5 105.777

w (%)
5.8
8.2
10.7
13.2
15.4
17.7

ϒd (pcf)
108.601
109.519
112.014
111.307
108.666
105.777

A Graph of w vs. ϒd
107.5
107

Yd (pcf)

106.5
106
105.5
105
104.5
104
0

2

4

6

8

10

12

Water Content (w) %

14

16

Column
Location
K-I
K-2
K-3
K-4
K-5

ϒ (pcf)

w (%)

121.7
123.6
123.8
126.9
121.8

14.1
11.2
12.5
10.8
13

ϒd, field
(pcf...


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