Foundation Engeering Contents Elevation SPB Elevation Cu Relationship

Foundation Engeering

Contents

Elevation - SPB Elevation - Cu Relationship (ft) 630 700 Elevation - Water content 600 Relationship 610 Elevation - SPB Relationship 500 590 400 Elevation - Cu Relationship 570 300 550 200 STS AECOM Soil boring location diagram Christ hosptal SEC 93 rd. and kostner Ave OAK LAWN, ILLINOIS 530 100 510 00 2 (lb/ft (% 20 8150 2 000 4 000100 6 000 1030 000 50 10 200 )

620(ft) 610(ft) 580(ft) 1 Layer Sand 2 Layer y a Cl 560(ft) 3 Layer d San 4 Layer k Roc

Dunham : cycle and uniformity sand : Ø= 12 N + 15 cycle and well graded sand : Ø= 12 N + 20 sharp and uniformity sand : Ø= 12 N + 20 sharp and well graded sand: Ø= 12 N + 25

Terzaghi’s equation(square) [1. 3 c’Nc + q. Nq Qu(all) = +0. 4 r. BNr]A FS σ = △ o A : Foundation area Nc, Nq, Nr : Bearing capacity factors FS : Safety factor Q (B+z)(L+z) Cc H σ ’+△σ ’ Sc= log 1+eo σ o’ o o B : width of foundation L : length of foundation Z : the increase in stress at depth Sc : consolidation settlement Cc : compression index H : height of clay

Sand 10 ft Ø = 27. 72 o rt = 109. 3 lb/ft 3 w = 9. 27% 30 ft e = 0. 42 w = 15. 59% Cc = 0. 081 Cu = 5588. 2 lb/ft 3 Z =15 ft Clay Sand Rock 20 ft Ø = 38 o rt = 124. 9 lb/ft 3 w = 16. 71% Cu = 7716. 1 lb/ft 3 Groundwater table L B

Se= 2 q Bg I Se : elastic settlement N 60 Cc H σ ’+△σ ’ Sc= log 1+eo σ o’ o o Sc : consolidation settlement Cc : compression index H : height of clay. H :

Clay e = 0. 42 rsat = 137. 1 lb/ft 3 w = 15. 59% Cc = 0. 081 Sand Ø = 38 o rt = 124. 9 lb/ft 3 w = 16. 71% Rock Groundwater table Bg Sand Ø = 27. 72 o rt = 120. 2 lb/ft 3 w = 9. 27% d Lg

Total settlement 42. 65 mm 39. 64 mm Allowable settlement 45. 00 mm E F A S

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