Indicative values of some important coefficients characteristic of the subsurface in the natural state!

USCS

Geotechnical designation

Average particle size distribution (mm)

Plastic properties

Density, water content, porosity

Shear resistance

Compression module

Transmittance coefficient

The terrain after Proctor module

Geotechnical designation

USCS

0 - 0,002

0,002 -0,06

0,06 – 2,0

2,0 – 60,0

Clay

Limo

Sand

Gravel

wL

wP

IP

γ

w

n

Φ’

c’

u

ME

k

wopt.

γdptt.

%

%

%

%

%

%

%

t/m3

%

%

[°]

t/m2

kg/cm2

cm/s

%

t/m3

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

GW

Cleaned and well graded gravel

0

2

26

72

-

-

-

2,00 ±0,25

5
±3

30
±6

40
±5

0

10+1...10-2

8
±2

2,10
±0,10

Cleaned and well graded gravel

GW

GP

Poorly graded clean gravel

Average values like those of GW

-

-

-

1,90
±0,30

3
±2

32
±8

38
±6

0

10+1...10-2

9
±2

2,05
±0,10

Poorly graded clean gravel

GP

GM

Sandy gravel with few fine elements

2

8

30

60

17

13

4

2,10
±0,25

8
±5

28
±8

36
±4

0

10-3...10-6

9
±3

2,10
±0,15

Sandy gravel with few fine elements

GM

GC

Clayey gravel with few fine elements

3

9

23

65

25

15

10

2,05
±0,20

11
±6

32
±8

34
±4

0

*

10-6...10-8

14
±7

1,95
±0,25

Clayey gravel with few fine elements

GC

GM-ML

Sandy gravel with many fine elements

4

20

33

43

14

11

3

2,15
±0,25

14
±9

30
±10

35
±5

0

10-3...10-5

8
±2

2,15
±0,10

Sandy gravel with many fine elements

GM-ML

GM-GC

Sandy clayey gravel

6

22

30

42

19

13

6

2,15
±0,20

11
±4

28
±7

33
±3

0,2
±0,2

*

10-6...10-8

9
±3

2,10
±0,10

Sandy clayey gravel

GM-GC

GC-CL

Clayey gravel with many fine elements

8

23

28

41

26

15

11

2,10
±0,20

14
±6

32
±7

29
±3

0,3
±0,3

*

10-6...10-8

11
±3

1,95
±0,15

Clayey gravel with many fine elements

GC-CL

GC-CH

Clayey gravel with fine elements of high plasticity

10

23

29

38

57

23

34

1,95
±0,20

20
±10

40
±10

28
±3

0,4
±0,4

*

10-6...10-8

1)

1)

Clayey gravel with fine elements of high plasticity

GC-CH

SW

Well-graded  clean sands

0

2

76

22

-

-

-

1,95
±0,20

13
±10

36
±10

38
±5

0

100...10-3

9
±3

2,05
±0,20

Well-graded  clean sands

SW

SP

Poorly graded  clean sands

Average values like those of SW

-

-

-

1,85
±0,25

11
±9

38
±10

36
±6

0

100...10-3

11
±3

1,95
±0,20

Poorly graded  clean sands

SP

SM

Silty sands with few fine elements

2

9

75

14

26

22

4

2,00 ±0,25

17
±7

37
±10

34
±3

0

10-3...10-6

11
±4

1,95
±0,25

Silty sands with few fine elements

SM

SC

Clayey sand with few fine elements

5

7

76

12

25

15

10

1,95
±0,20

20
±10

40
±10

32
±4

0

*

10-6...10-3

1)

1)

Clayey sand with few fine elements

SC

SM-ML

Silty sand with many fine elements

4

28

60

8

15

12

3

2,00 ±0,20

20
±9

38
±9

34
±3

0

10-3...10-6

9
±3

2,05

±0,25

Silty sand with many fine elements

SM-ML

SM-SC

Silty to clayey sand

9

32

45

14

19

13

6

2,10
±0,20

15
±8

32
±10

31
±3

0,5

±0,5

*

10-6...10-3

10
±3

2,00

±0,25

Silty to clayey sand

SM-SC

SC-CL

Clayey sand with many fine elements

9

30

43

18

25

15

10

2,05
±0,20

19
±10

36
±11

28
±4

0,5

±0,5

*

10-6...10-3

15
±3

1,85
±0,15

Clayey sand with many fine elements

SC-CL

SC-CH

Clayey sand with fine elements of high plasticity

12

31

54

3

57

23

34

1,85
±0,20

35
±15

49
±10

27
±3

1,0

±1,0

*

10-6...10-8

1)

1)

Clayey sand with fine elements of high plasticity

SC-CH

ML

Silt

6

64

29

1

30

26

4

1,90
±0,25

32
±21

47
±15

33
±4

0

(*)

60...200

10-3...10-6

1)

1)

Silt

ML

CL-ML

Silt

Clay

12

58

26

4

20

14

6

2,10
±0,15

19
±7

35
±8

30
±4

1,5

±1,0

*

40...200

10-5...10-8

1)

1)

Silt

Clay

CL-ML

CL

Clayey silt

20

61

16

3

33

17

16

2,00 ±0,15

25
±10

41
±4

27
±4

2,0

±1,0

**

20...200

10-6...10-8

14
±3

1,85
±0,15

Clayey silt

CL

CH

Clay

22

59

18

1

64

25

39

1,75
±0,15

47
±24

56
±9

22
±4

2,5

±1,0

**

10...100

10-6...10-8

1)

1)

Clay

CH

OL

Clayey silt with organic matter

8

70

21

1

42

29

13

1,70
±0,15

48
±13

57
±8

25
±4

1,0

±0,5

(*)

15...100

10-4...10-6

1)

1)

Clayey silt with organic matter

OL

OH

Clay with organic matter

12

70

17

1

71

40

31

1,55
±0,15

68
±22

66
±8

22
±4

1,0

±0,5

**

8...50

10-6...10-8

1)

1)

Clay with organic matter

OH

MH

Special silts, e.g., lacustrine chalk

1

65

25

0

68

38

30

1,55
±0,15

73
±20

67
±7

24
±6

0,5

±0,5

(*)

10...50

10-4...10-6

1)

1)

Special silts, e.g., lacustrine chalk

MH

USCS

Geotechnical designation

Clay

Limo

Sand

Gravel

wL

wP

IP

γ

w

n

Φ’

c’

u

ME

k

wopt.

γdptt.

Geotechnical designation

USCS

Average particle size distribution (mm)

Plastic properties

Density, water content, porosity

Shear resistance

Compression module

Transmittance coefficient

The terrain after Proctor module