Foundations on Problematic Soils

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Foundations on Problematic Soils

Text of Foundations on Problematic Soils

4th Year Civil

FOUNDATION ENGINEERING

FOUNDATIONS ON PROBLEMATIC SOILS

18 September 2010

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1

. :1- Expansive Soils 2- Collapsible Soils 3- Soft Clay Soils18 September 2010 Problematic Soils 2

(

)

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1- Expansive Soils (.

)

. . :

I A!18 September 2010

: A: IpCProblematic Soils

-

C2

11

1- Expansive Soils (

)-

: :(Swelling Pressure) . :(Axial Swelling) . / 0.10 :(Swelling Potential)2 2

-

-

/

0.0712

.18 September 2010 Problematic Soils

1- Expansive Soils (24

)40

:(Free Swelling) 3 10 3 100 :

Vf - Vi F. S. ! x 100 Vi

Vf Vi%50 %100 %50 %100

18 September 2010

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1- Expansive Soils70 60

y=

2.0

0

tiv it

Plasticity Index P.I. (%)

50

Ac

1

2

AVERY HIGH40

= ty i tiv c

.00 1

3

30

.7 0 0 0 0 .6 .5 0 0

1 - BH (6), D = 4.50 - 6.00 Merwe, Merwe, 2 - BH (6), D = 1.50 - 4.50

Van Der

1964 3 - BH (7), D = 1.50 - 3.00

HIGH20

MEDIUM10

LOW

0 0 10 20 30 40 50 60 70

Clay Content, less than 2 Micron (%)18 September 2010 Problematic Soils 14

1- Expansive Soils0.07 2 / 30 30 20 10 20 10 11 12 16 15 7 10 (%) 2>

35 41 28 18 25 15

28 31 23 15 20 13

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. : . .

-1 -2 . -

. 18 September 2010 Problematic Soils 16

2- Collapsing Soils( ) .

. : 173

/ .

11 .3 /

-

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:(Collapsibility Potential)2

/

200 .(2 / 2)

(H C.P. ! x 100 HoC.P. = Collapsibility Potential (H = Ho =

:

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200 kPa

(H

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%1 %5 %1 %10 %5 %20 %10 %20

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. : . . .( )

-1 -2 .

.18 September 2010 Problematic Soils

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