Geotechnical Engineering

DHARM

470 GEOTECHNICAL ENGINEERING

E

C

(45° – /2)

f

(45° – /2)

f

t

tsf=c+ tan

f

c

O A

f

Mohr’s circle

for cohesionless

soil ( )II

Mohr’s

circle for

cohesionless

soil ( )I

Mohr-coulomb

envelope for a c- soil

f

ts f= tan

for a -soilf

sg 3 =z

ss1h=

ss1hc= c

JDH s

B

Fig. 13.16 Mohr’s circles of stress of passive pressure for

a cohesionless soil and for a cohesive soil

+

H

H/3

2c NÖ f

Cohesive

fill

gHNf

Pp²

+ Pp¢

H/2

Pp

2c NÖ f

Fig. 13.17 Passive pressure distribution for the cohesive soil

13.7 Coulomb's Wedge Theory

Charles Augustine Coulomb (1776), a famous French scientist and military engineer, was the
first to try to give a scientific basis to the hazy and arbitrary ideas existing in his time regard-
ing lateral earth pressure on walls.