Chance Technical Design Manual

FRICTION CALCULATION (SEE SOIL BORING LOG IN FIGURE 8-4), TABLE 8-4

ESTIMATED EFFECTIVE UNIT WEIGHT (lb/ft 3 ) COHESION (lb/ft 2 ) j

AVERAGE OVERBURDEN (lb/ft 2 )

ADHESION/ FRICTION (lb/ft 2 )

SIDE FRICTION (lb)

DEPTH (ft)

SOIL “N”

DESIGN EXAMPLES

0 -9 Clay 6

750

-

92

-

682

8040

9 - 15 Clay 2

250

-

84

-

250

1965

15 - 18 Clay 1

125

-

20

-

125

491

18 - 22 Sand 5

-

29

23

1438

798

3192

22 - 28 Clay 7

875

-

32

-

682

5364

28 - 31 3003 TOTAL 22055 Notes: (1) j = 0.28N + 27.4 (2) c = (N x 1000) / 8 (3) Area/ft of pile = p x d = p (5/12) = 1.31ft 2 /ft Sand 8 - 30 38 1733 1001

HELICAL PULLDOWN ® MICROPILE COMPRESSION TEST FIGURE 8-3

Hubbell Power Systems, Inc. | All Rights Reserved | Copyright © 2023 | Page 8-11