Table 2 Summary of Geotechnical result.

From: Foundation integrity assessment of failed buildings in Ehamufu and Aguamede, South East Nigeria

Geotechnical test

Parameters

AG01

AG02

AG03

AG04

AG05

EH01

EH02

EH03

EH04

EH05

Grain size analysis

Sand %

8.27

11.71

5.81

10.99

4.42

9.62

7.12

14.54

10.41

7.53

Silt %

17.41

19.88

14.56

23.83

13.21

10.81

11.25

22.68

11.27

16.51

Clay%

74.32

68.41

79.63

65.18

82.37

76.57

81.63

62.78

78.32

75.96

Atterbeg limits

Liquid limit %

52

54

51

52

53

48

46

50

49

52

Plastic limit %

24

28

31

26

27

24

25

25

27

27

Plasticity index %

28

26

20

26

26

24

21

25

22

25

Consistency indices

Liquidity index %

9.79

− 10.81

− 19.40

1.81

− 0.73

4.42

10.86

5.84

− 6.23

− 0.52

Consistency index%

90.21

110.81

119.40

98.19

100.73

95.58

89.14

94.16

106.23

100.52

Compaction

Max. dry density (g/cm3)

1.73

1.76

1.68

1.79

1.86

1.93

1.95

1.89

1.98

1.91

Opt. moisture content (%)

19.8

18.3

19.0

18.0

19.5

17.9

18.6

17.5

16.9

17.5

Specific gravity

(G/CM2)

2.34

2.49

2.35

2.42

2.47

2.59

2.61

2.54

2.66

2.51

Moisture content

(%)

26.74

25.19

27.12

26.47

26.81

25.06

27.28

26.46

25.63

26.87

Permeability (K)

(m/sec)

3.15 × 10−7

4.27 × 10−8

9.03 × 10−8

1.74 × 10−6

1.56 × 10−7

5.24 × 10−7

2.21 × 10−8

2.24 10−8

6.28 × 10−7

3.49 × 10−6

Undrained triaxial Test

Cohesion (C) (KN/m2)

34.1

36.4

35.3

32.8

33.6

35.0

34.8

34.2

32.0

35.8

Intergranular friction angle (Φ) (o)

11

9.6

10.8

11

10

15

12

14

13

12

Ultimate bearing capacity (Qu)

347.25

353.10

359.78

360.45

329.18

379.20

356.34

330.40

328.79

388.73

Safe Bearing capacity (Qs)

132.08

135.57

136.95

137.33

127.44

143.05

136.13

126.41

125.94

146.87

Consolidation

Compression Index (Cc)

0.29

0.31

0.29

0.29

0.30

0.27

0.27

0.28

0.27

0.29

Coefficient of Consolidation (Cv) (Cv) (M2/yr)

0.12

0.21

0.17

0.04

0.94

0.22

0.11

0.23

0.16

0.18

Coefficient of Volume Change (M2/kN)

0.00017

0.00023

0.00013

0.00012

0.00015

0.00028

0.00016

0.00025

0.00013

0.00021

Settlement Amount (mm/yr) at pressure load of 400kN/m2

0.605

0.654

0.581

0.613

0.553

0.630

0.606

0.640

0.578

0.582

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