+)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))),
*F. Compute +L, at depth corresponding to Z/B = 20 (Z = 30) in order to
*
*
*
compute average Increase of positive resistance with depth:
*
*
*
K+q, = 3.1, K+c, = 16
*
*
*
*
[sigma]+L, = 3.1 x 30 x 0.05 + 16 x 0.2 = 7.85 KSF
*
*
*
Average increase in lateral resistance below D+s,:
*
*
*
*
*
[sigma]+L+avg,, = (7.85 - 3.97)/(30 - 9) = 0.185 KSF/ft
*
*
*
Assume that the direction of lateral resistance changes at depth d+1, *
*
*
*
beneath failure surface, then:
*
*
*G. Calculate depth of penetration d by solving the following equations
*
*
*
and increase d by 30% for safety:
*
*
*
T + F+2, - F+1, = 0
*
(1)
*
*
*
F+1,L+1, = F+2,L+2,
*
(2)
*
*
*
*
Compute forces per unit pile width:
*
*
*
T = 24.43.k-
*
*
*
*
F+1, = 3.97d+1, + 0.092d+1,.2-
*
*
*
*
F+2, = (3.97 + 0.185d+1,)(d-d+1,) + 0.092 (d-d+1,).2-
*
*
*
*
= 0.092d.2- + 3.97d - 3.97+d,.1- - 0.092d+1,.2-
*
*
*
*H. Use Eq (1) in Step G to calculate d+1, for given values of d.
*
*
*
*
24.43 + 0.092d.2- + 3.97d - 7.94d+1, - 0.185d+1,.2- = 0
*
*
*
*
24.43 + 0.092d.2- + 3.97d
*
d+1,.2- + 42.9d+1, - ))))))))))))))))))))))))) = 0
*
*
*
*
0.185
*
*
Let d = 15.8', then d+1, = 11.0'
*
*
*
*
*
From Eq (2) Step G (consider each section of pressure diagram broken *
*
*
down as a rectangle and triangle).
*
*
.))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))-
FIGURE 13 (continued)
Example Calculation - Pile Stabilized Slopes
7.1-344