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:
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:
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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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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