A square foundation is 3m x 3m and is 1.5m below the ground surface. The soil supporting the foundation has a unit weight of 16.5kN/m3, an angle of internal friction of 25degrees and a cohesion of 25kPa. Use the given Table for the determination of the bearing capacity factors. a. Determine the bearing capacity of foundation. b. Determine the allowable load per unit area if the factor of safety is 2. c. Allowable load is:

Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter16: Shallow Foundations-bearing Capacity
Section: Chapter Questions
Problem 16.6P: The applied load on a shallow square foundation makes an angle of 15 with the vertical. Given: B =...
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' (deg)
N;
N;
A square foundation is 3m x 3m and is
1.5m below the ground surface. The soil
supporting the foundation has a unit
weight of 16.5kN/m3, an angle of internal
friction of 25degrees and a cohesion of
25kPa. Use the given Table for the
determination of the bearing capacity
N.
N.
6' (deg)
N.
N.
5.70
1.00
0.00
26
27.09
14.21
9.84
1
6.00
1.10
0.01
27
29.24
16.90
11.60
17.81
19.98
6.30
1.22
0.04
28
31.61
13.70
3
6.62
1.35
0.06
29
34.24
16.18
4
6.97
1.49
0.10
30
37.16
22.46
19.13
5
7.34
22.65
1.64
1.81
0.14
31
40.41
25.28
6.
7.73
0.20
32
44.04
28.52
26.87
8.15
2.00
0.27
33
48.09
32.23
31.94
8
8.60
2.21
0.35
34
52.64
36.50
38.04
factors.
9.09
2.44
0.44
35
57.75
41.44
45.41
0.56
0.69
10
9.61
2.69
36
63.53
47.16
54.36
11
10.16
2.98
37
70.01
53.80
65.27
a. Determine the bearing capacity of
77.50
78.61
12
10.76
3.29
0.85
38
61.55
foundation.
13
11.41
3.63
1.04
39
85.97
70.61
95.03
14
12.11
4.02
1.26
40
95.66
81.27
116.31
b. Determine the allowable load per unit
area if the factor of safety is 2.
C. Allowable load is:
4.45
1.52
1.82
2.18
16
12.86
41
106.81
93.85
140.51
16
13.68
4.92
42
119.67
108.75
171.99
17
14.60
5.45
43
134.58
126.50
211.56
18
15.12
6.04
2.59
44
161.95
147.74
261.60
16.56
17.69
172.28
196.22
19
6.70
3.07
45
173.28
325.34
20
7.44
3.64
46
204.19
407.11
21
18.92
8.26
4.31
47
224.55
241.80
512.84
22
20.27
9.19
5.09
48
258.28
287.85
650.67
23
21.75
10.23
6.00
49
298.71
344.63
831.99
1072.80
7.08
8.34
24
23.36
11.40
50
347.50
416.14
25
25.13
12.72
Transcribed Image Text:' (deg) N; N; A square foundation is 3m x 3m and is 1.5m below the ground surface. The soil supporting the foundation has a unit weight of 16.5kN/m3, an angle of internal friction of 25degrees and a cohesion of 25kPa. Use the given Table for the determination of the bearing capacity N. N. 6' (deg) N. N. 5.70 1.00 0.00 26 27.09 14.21 9.84 1 6.00 1.10 0.01 27 29.24 16.90 11.60 17.81 19.98 6.30 1.22 0.04 28 31.61 13.70 3 6.62 1.35 0.06 29 34.24 16.18 4 6.97 1.49 0.10 30 37.16 22.46 19.13 5 7.34 22.65 1.64 1.81 0.14 31 40.41 25.28 6. 7.73 0.20 32 44.04 28.52 26.87 8.15 2.00 0.27 33 48.09 32.23 31.94 8 8.60 2.21 0.35 34 52.64 36.50 38.04 factors. 9.09 2.44 0.44 35 57.75 41.44 45.41 0.56 0.69 10 9.61 2.69 36 63.53 47.16 54.36 11 10.16 2.98 37 70.01 53.80 65.27 a. Determine the bearing capacity of 77.50 78.61 12 10.76 3.29 0.85 38 61.55 foundation. 13 11.41 3.63 1.04 39 85.97 70.61 95.03 14 12.11 4.02 1.26 40 95.66 81.27 116.31 b. Determine the allowable load per unit area if the factor of safety is 2. C. Allowable load is: 4.45 1.52 1.82 2.18 16 12.86 41 106.81 93.85 140.51 16 13.68 4.92 42 119.67 108.75 171.99 17 14.60 5.45 43 134.58 126.50 211.56 18 15.12 6.04 2.59 44 161.95 147.74 261.60 16.56 17.69 172.28 196.22 19 6.70 3.07 45 173.28 325.34 20 7.44 3.64 46 204.19 407.11 21 18.92 8.26 4.31 47 224.55 241.80 512.84 22 20.27 9.19 5.09 48 258.28 287.85 650.67 23 21.75 10.23 6.00 49 298.71 344.63 831.99 1072.80 7.08 8.34 24 23.36 11.40 50 347.50 416.14 25 25.13 12.72
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