ABSTRACT

He found a close correlation between cu/p/ and Ip as illustrated in Fig. 8.37. Though the Eq. (8.55) was originally meant for normally consolidated clays, it has been used for overconsolidated clays also. p /may be replaced by Po /as the existing effective overburden pressure for normally consolidated clays, and by Pc/ for overconsolidated clays. Peck et aI., (1974) has extensively used this relationship for determining preconsolidation pressure Pc~ Eq. (8.55) may also be used for determining Pc / indirectly. If Pc / can be determined independently, the value of the undrained shear strength C

u for overconsolidated clays can be obtained from Eq. (8.55). The values

so obtained may be checked with the values determined in the laboratory on undisturbed samples of clay.