FIGURE 6.20 Passive earth pressure theory. Left diagram presents passive earth pressure theory for cohesionless soil (c′=0). Middle diagram presents passive earth pressure
theory for the undrained shear strength of cohesive soil (f=0, c=s
u
). The diagram on the right side is used for combined cohesion and friction, e.g., consolidated undrained
shear strength parameters (cand f) for cohesive soil such as shown in Fig. 3.36. (Reproduced from NAVFAC DM-7.2, 1982.)