Consolidation Settlement e H e o VOIDS e f VOIDS H o H f 1 - - PDF document

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Consolidation Settlement e H e o VOIDS e f VOIDS H o H f 1 SOLIDS 1 SOLIDS 2.10 1.21 0.89 log 8 0.99 log 800 100 2.10 Compression Index 1.21 10 100

SLIDE 1

Consolidation Settlement

SLIDE 2

e

SOLIDS VOIDS

1 eo Ho

SOLIDS VOIDS

1 ef Hf H

SLIDE 3

2.10 1.21 10 100 1000

2.10 1.21 log 800 100 ⁄ 0.89 log 8 0.99

Compression Index

SLIDE 4

2.10 1.10 10 100 1000

2.10 1.10 log 1000 100 ⁄ 1.00 log 10 1.00 1 1.00

Compression Index

SLIDE 5

0.14 0.38

0.38 0.14 log 800 100 ⁄ 0.24 log 8 0.27

10 100 1000

SLIDE 6

Cc Compression Ratio

0.38 0.10 log 800 80 ⁄ 0.28 1 0.28

10 100 1000 0.38 0.10

SLIDE 7

Silty Sand  = 100 pcf ´ = 50 pcf, Cc = 0.25 Surcharge  = 125 pcf 20 ft 25 ft 20 ft

SLIDE 8

Silty Sand  = 100 pcf Surcharge  = 125 pcf 20 ft 25 ft 10 ft ´ = 50 pcf, Cc = 0.25 10 ft

SLIDE 9

´ = 50 pcf, Cc = 0.25 Surcharge  = 125 pcf 20 ft 20 ft Silty Sand  = 100 pcf 25 ft

SLIDE 10

Surcharge  = 125 pcf 20 ft Silty Sand  = 100 pcf 25 ft 10 ft 10 ft ´ = 50 pcf, Cc = 0.25

SLIDE 11

Normally-Consolidated Soils

   

 

                         log log log log

top top bot bot c vo vo vo vo top top bot bot c vf vf vf vf

C H C

SLIDE 12

´ = 50 pcf, Cc = 0.25 Surcharge  = 125 pcf 20 ft 20 ft Silty Sand  = 100 pcf 25 ft

SLIDE 13

Surcharge  = 125 pcf 20 ft Silty Sand  = 100 pcf 25 ft ´ = 50 pcf, Cc = 0.25 15.45 ft

SLIDE 14

FINAL GRADE 455.0 Clayey Sand,  = 120 pcf, ´ = 60 pcf NC Sandy Clay, ´ = 60 pcf, Cc = 0.25 425.0 440.0 447.0 Compacted Fill,  = 125 pcf 444.0 A 10 ft

SLIDE 15

(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)

OCM

SLIDE 16

(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)

SLIDE 17

(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)

SLIDE 18

Over-Consolidated Soils

     

   

                                      log log log log log log

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C C H C C

For cases where the OCM is constant with depth

SLIDE 19

(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)

SLIDE 20

Over-Consolidated Soils

     

                                log log log log log log

bot bot bot top top top r c p p p p p p p bot bot bot top top top r vo vo vo vo vo vo

bot bot top top top c vf vf vf vf vf vf f

C C H s C s C s

   

                 

For cases where the OCM is not constant with depth

        

p p

f vf

s d dz s d dz s d dz