Civil Engineering Reference
In-Depth Information
Figure 9.13
(a) State parameters for shear tests. (b) State parameters for triaxial tests.
Eq. (8.6) or (8.12) except the state parameter is related to the critical state line while
the overconsolidation ratio is related to the normal compression line.
9.10 Simple experimental investigations of
critical states
In any theoretical or experimental study of soil, and in many design studies, it is
essential to determine the position of the critical state line as accurately as possible.
This is needed to determine the ultimate strength for many of the design analyses
described in Chapters 19 to 25 and it is also required to determine the ultimate states
of soil samples. It is important to be able to distinguish between states on the wet side
