The most common field test to estim

The most common field test to estimate cuA is the cone penetration test (CPT) apartfrom vane shear testing. The cone penetrometer with measurement of pore pressure,called CPTU test (developed in the late 1970s) developed as a research tool, whichgradually became commercial tool. Over the years, CPTU has tested widely and nowit has become the most common in situ testing tool for determination of undrainedstrength of clay deposits. The major advantage of CPTU is that it helps in establishinga continuous cuA profile with the depth. The value of cuA is can be calculated usingthree different cone factors: Nkt, Nu, and Nke.