Environmental Engineering Reference
In-Depth Information
FIGURE 2.38 (a)
Cone penetrometer test equipment: (a) interior of CPT truck showing hydraulic force apparatus. (Courtesy of
Fugro.)
stopped at the desired depth and readings are taken until the pore pressure generated by
the penetration has dissipated. The coefficient of consolidation (
c
h
) and the coefficient for
horizontal hydraulic conductivity (
k
h
) are determined. Hole inclination is also recorded
with the piezocone illustrated as in
Figure 2.39a.
A plot of a CPTU log showing point and
shaft friction, friction ratio, pore pressures, and a soil log is given in
Figure 2.40.
CPT plots
now normally include the friction ratio and, with the CPTU, pore pressure measurements.
