Geotechnical Engineering

DHARM

LATERAL EARTH PRESSURE AND STABILITY OF RETAINING WALLS 481

20° 30° 40°

–10

0°

10°

20°

30°

40°

Wall friction angle,

d

Friction angle,f

15

7.5 10

5

4

K=

3

p

(^2) 2.5
Fig. 13.26 Chart for passive pressure coefficient
(After Caquot and Kerisel, 1949)
Alternatively, Sokolovski’s (1965) method may be used. This also gives essentially the
same results.
The theoretical predictions regarding passive resistance with wall friction are not well
confirmed by experimental evidence as those regarding active thrust and hence cannot be
used with as much confidence. Tschebotarioff (1951) gives the results of a few large-scale labo-
ratory tests in this regard.
13.7.4Rebhann’s Condition and Graphical Method
Rebhann (1871) is credited with having presented the criterion for the direct location of the
failure plane assumed in the Coulomb’s theory. His presentation is somewhat as follows:
Figure 13.27 (a) represent a retaining wall retaining a cohesionless backfill inclined at
+β to the horizontal. Let BC be the failure plane, the position of which is to be determined.
A
C
(+)fd
H
a
+d
Pa y
a
x
D
y G
y E
W
J
f
R
fq
B
d c
b
f-line
b
(a) Retaining wall with backfill